{"id":10245,"date":"2026-02-13T11:31:49","date_gmt":"2026-02-13T02:31:49","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=10245"},"modified":"2026-02-13T11:46:29","modified_gmt":"2026-02-13T02:46:29","slug":"javascript-blob","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/javascript-blob\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011Blob\u306e\u4f7f\u3044\u65b9\u30fb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u306e\u65b9\u6cd5"},"content":{"rendered":"\n<p>JavaScript\u3067\u306f\u3001\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3092\u6271\u3048\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e1\u3064\u306b Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<br>\u69d8\u3005\u306a\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046\u904e\u7a0b\u3067\u6d3b\u7528\u3055\u308c\u3066\u3044\u308b\u3001\u4e3b\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e1\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306f\u3001JavaScript\u3067 Blob\u3092\u6271\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">Blob\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>Blob\u3068\u306f\u3001JavaScript\u3067\u4f7f\u7528\u53ef\u80fd\u306a Web API\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\uff09\u306e\u4e00\u7a2e\u3067\u3059\u3002<br>\u6b63\u5f0f\u306b\u306fBinary Large Object\u306e\u7565\u79f0\u3067\u3001\u30c6\u30ad\u30b9\u30c8\u3084\u753b\u50cf\u3001\u97f3\u58f0\u30d5\u30a1\u30a4\u30eb\u306a\u3069\u3068\u3044\u3063\u305f\u3088\u3046\u306a\u3001\u69d8\u3005\u306a\u30bf\u30a4\u30d7\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4fdd\u6301\u3059\u308b\u30c7\u30fc\u30bf\u306f\u3001\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\uff08\u4e0d\u5909\uff09\u306a\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u305f\u3081\u3001\u5f8c\u304b\u3089\u76f4\u63a5\u5185\u5bb9\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u7279\u5fb4\u3092\u6301\u3061\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001Blob\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u7ba1\u7406\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u3001\u8aa4\u3063\u305f\u30c7\u30fc\u30bf\u6539\u5909\u3084\u7834\u640d\u306e\u30ea\u30b9\u30af\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30eb\u306e\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3084\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3001\u753b\u50cf\u3084\u52d5\u753b\u306e\u30d7\u30ec\u30d3\u30e5\u30fc\u6a5f\u80fd\u306a\u3069\u3001\u69d8\u3005\u306a\u30b1\u30fc\u30b9\u3067\u6d3b\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">Blob\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>Blob\u306e\u5177\u4f53\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3001\u9806\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u57fa\u672c\u69cb\u6587\u304b\u3089\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<br>Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u65b0\u305f\u306b\u751f\u6210\u3059\u308b\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u69cb\u6587\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>const blob = new Blob(\u30c7\u30fc\u30bf, \u30e1\u30c7\u30a3\u30a2\u30bf\u30a4\u30d7);<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> blob <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">Blob<\/span><span style=\"color: #EEFFFF\">(\u30c7\u30fc\u30bf<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> \u30e1\u30c7\u30a3\u30a2\u30bf\u30a4\u30d7)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Blob\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u7b2c1\u5f15\u6570\u306b\u306f\u3001Blob\u3067\u4fdd\u6301\u3059\u308b\u30c7\u30fc\u30bf\u3092\u8981\u7d20\u306b\u542b\u3080\u914d\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7b2c2\u5f15\u6570\u306b\u306f\u3001\u30c7\u30fc\u30bf\u306e\u7a2e\u985e\u3092\u793a\u3059\u30e1\u30c7\u30a3\u30a2\u30bf\u30a4\u30d7\uff08MIME\u30bf\u30a4\u30d7\uff09\u3092\u4efb\u610f\u3067\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<br>\u30e1\u30c7\u30a3\u30a2\u30bf\u30a4\u30d7\u306e\u7a2e\u985e\u306b\u306f\u3001\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf \u2026 text\/plain (.txt, .text)\u3001\u00a0text\/html (.htm, .html)<\/li>\n\n\n\n<li>\u753b\u50cf\u30c7\u30fc\u30bf \u2026 image\/png (.png)\u3001\u00a0image\/jpeg (.jpg, .jpeg)\u3001image\/webp (.webp)<\/li>\n\n\n\n<li>JSON\u30c7\u30fc\u30bf \u2026 application\/json (.json)<\/li>\n\n\n\n<li>PDF\u30d5\u30a1\u30a4\u30eb \u2026 application\/pdf (.pdf)<\/li>\n<\/ul>\n\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">\u4efb\u610f\u306e\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b<\/h3>\n\n\n\n<p>Blob \u306e\u5b9f\u969b\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3001\u7c21\u5358\u306a\u4f8b\u3092\u5143\u306b\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092 Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>const blob = new Blob(&#91;'Hello world!'&#93;, {type:'text\/plain'});\nconsole.log(blob);<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> blob <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">Blob<\/span><span style=\"color: #EEFFFF\">(&#91;<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">Hello world!<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">&#93;<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><span style=\"color: #F07178\">type<\/span><span style=\"color: #89DDFF\">:<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">text\/plain<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #89DDFF\">}<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">console<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">log<\/span><span style=\"color: #EEFFFF\">(blob)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">\u5b9f\u884c\u7d50\u679c<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>Blob\u00a0{size: 12, type: 'text\/plain'}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #EEFFFF\">Blob\u00a0{size: 12, type: &#39;text\/plain&#39;}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001size \u3068 type \u306e\uff12\u3064\u304c\u3042\u308a\u307e\u3059\u3002<br>size\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\uff08\u30d0\u30a4\u30c8\u5358\u4f4d\uff09\u3001type\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u6642\u306b\u6307\u5b9a\u3057\u305fMIME\u30bf\u30a4\u30d7\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">Blob\u306e\u6d3b\u7528\u6cd5<\/h2>\n\n\n\n<p>\u7d9a\u3044\u3066\u306f\u3001Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u69d8\u3005\u306a\u6d3b\u7528\u6cd5\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">FileReader\u3067Blob\u306e\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080<\/h3>\n\n\n\n<p>Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4fdd\u6301\u3059\u308b\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u969b\u306f\u3001FileReader\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br>FileReader\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3001Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306e\u69d8\u3005\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u307f\u305f\u3044\u5834\u5408\u306b\u306f\u3001readAsText\u30e1\u30bd\u30c3\u30c9\u304c\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>const blob = new Blob(&#91;'Hello world!'&#93;, {type:'text\/plain'});\nconst reader = new FileReader();\n\nreader.onload = function() {\n    console.log(reader.result);\n};\n\nreader.readAsText(blob);<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> blob <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">Blob<\/span><span style=\"color: #EEFFFF\">(&#91;<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">Hello world!<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">&#93;<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><span style=\"color: #F07178\">type<\/span><span style=\"color: #89DDFF\">:<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">text\/plain<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #89DDFF\">}<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> reader <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">FileReader<\/span><span style=\"color: #EEFFFF\">()<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">reader<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">onload<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #C792EA\">function<\/span><span style=\"color: #89DDFF\">()<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F07178\">    <\/span><span style=\"color: #EEFFFF\">console<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">log<\/span><span style=\"color: #F07178\">(<\/span><span style=\"color: #EEFFFF\">reader<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #EEFFFF\">result<\/span><span style=\"color: #F07178\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #89DDFF\">};<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">reader<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">readAsText<\/span><span style=\"color: #EEFFFF\">(blob)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">Plaintext<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>Hello world!<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #EEFFFF\">Hello world!<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>FileReader\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5404\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u304c\u5b8c\u4e86\u3059\u308b\u3068 result\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u7d50\u679c\u3092\u683c\u7d0d\u3057\u3001\u30a4\u30d9\u30f3\u30c8\u3092\u767a\u751f\u3055\u305b\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001addEventListener\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30a4\u30d9\u30f3\u30c8\u3092\u767b\u9332\u3059\u308b\u304b\u3001\u5bfe\u5fdc\u3059\u308b\u30a4\u30d9\u30f3\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u95a2\u6570\u3092\u4ee3\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u8aad\u307f\u8fbc\u307f\u5b8c\u4e86\u5f8c\u306b\u4efb\u610f\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_2\" class=\"wp-block-heading\">Blob\u306e\u30c7\u30fc\u30bf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b<\/h3>\n\n\n\n<p>Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4fdd\u6301\u3059\u308b\u30c7\u30fc\u30bf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u53ef\u80fd\u306b\u3057\u305f\u3044\u5834\u5408\u306b\u6d3b\u7528\u3067\u304d\u308b\u306e\u304c\u3001URL.createObjectURL\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u5bfe\u8c61\u306eBlob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30c7\u30fc\u30bf\u5185\u5bb9\u3092\u5143\u306bURL\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30ea\u30f3\u30af\u3068\u3057\u3066\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">HTML<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>&lt;a class=\"downloadBlob\" download=\"sampleBlob.txt\">Blob\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9&lt;\/a><\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #89DDFF\">&lt;<\/span><span style=\"color: #F07178\">a<\/span><span style=\"color: #89DDFF\"> <\/span><span style=\"color: #C792EA\">class<\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">downloadBlob<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\"> <\/span><span style=\"color: #C792EA\">download<\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">sampleBlob.txt<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\">&gt;<\/span><span style=\"color: #EEFFFF\">Blob\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/span><span style=\"color: #89DDFF\">&lt;\/<\/span><span style=\"color: #F07178\">a<\/span><span style=\"color: #89DDFF\">&gt;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>const blob = new Blob(&#91;'Hello world!'&#93;, {type:'text\/plain'});\nconst dlLink = document.querySelector('.downloadBlob');\n\ndlLink.href = URL.createObjectURL(blob);<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> blob <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">Blob<\/span><span style=\"color: #EEFFFF\">(&#91;<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">Hello world!<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">&#93;<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><span style=\"color: #F07178\">type<\/span><span style=\"color: #89DDFF\">:<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">text\/plain<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #89DDFF\">}<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> dlLink <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> document<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">querySelector<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">.downloadBlob<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">dlLink<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #EEFFFF\">href <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> URL<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">createObjectURL<\/span><span style=\"color: #EEFFFF\">(blob)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001href\u5c5e\u6027\u306e\u8a2d\u5b9a\u3092 JavaScript\u5074\u3067\u884c\u3046\u3053\u3068\u306b\u3088\u3063\u3066\u3001createObjectURL\u30e1\u30bd\u30c3\u30c9\u3067\u4f5c\u6210\u3057\u305fURL\u3092\u30ea\u30f3\u30af\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u6642\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u306f\u3001download\u5c5e\u6027\u3067\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">Canvas\u306e\u753b\u50cf\u3092Blob\u306b\u5909\u63db\u3057\u3066\u4fdd\u5b58\u3059\u308b<\/h2>\n\n\n\n<p>Canvas API\u3067\u63cf\u753b\u3055\u308c\u305f\u753b\u50cf\u3082\u3001Blob\u30c7\u30fc\u30bf\u306b\u5909\u63db\u3057\u3066\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3055\u305b\u308b\u305f\u3081\u306e\u753b\u50cf\u3092\u63cf\u753b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">HTML<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>&lt;canvas class=\"sampleCanvas\" width=\"300\" height=\"300\">&lt;\/canvas><\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #89DDFF\">&lt;<\/span><span style=\"color: #F07178\">canvas<\/span><span style=\"color: #89DDFF\"> <\/span><span style=\"color: #C792EA\">class<\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">sampleCanvas<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\"> <\/span><span style=\"color: #C792EA\">width<\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">300<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\"> <\/span><span style=\"color: #C792EA\">height<\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">300<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\">&gt;&lt;\/<\/span><span style=\"color: #F07178\">canvas<\/span><span style=\"color: #89DDFF\">&gt;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>\/\/ Canvas\u306e\u53d6\u5f97\nconst canvas = document.querySelector('.sampleCanvas'); \n\/\/ Canvas\u304b\u3089\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u53d6\u5f97\nconst context = canvas.getContext('2d'); \n\n\/\/ \u63cf\u753b\u3059\u308b\u753b\u50cf\u306e\u8272\u3092\u6307\u5b9a\ncontext.fillStyle = 'red'; \n\/\/ \u63cf\u753b\u3059\u308b\u753b\u50cf\u306e\u4f4d\u7f6e\u3068\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\ncontext.fillRect(50, 50, 200, 200);<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #546E7A; font-style: italic\">\/\/ Canvas\u306e\u53d6\u5f97<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> canvas <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> document<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">querySelector<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">.sampleCanvas<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><span style=\"color: #EEFFFF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #546E7A; font-style: italic\">\/\/ Canvas\u304b\u3089\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u53d6\u5f97<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> context <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> canvas<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">getContext<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">2d<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><span style=\"color: #EEFFFF\"> <\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #546E7A; font-style: italic\">\/\/ \u63cf\u753b\u3059\u308b\u753b\u50cf\u306e\u8272\u3092\u6307\u5b9a<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">context<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #EEFFFF\">fillStyle <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">red<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #89DDFF\">;<\/span><span style=\"color: #EEFFFF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #546E7A; font-style: italic\">\/\/ \u63cf\u753b\u3059\u308b\u753b\u50cf\u306e\u4f4d\u7f6e\u3068\u30b5\u30a4\u30ba\u3092\u6307\u5b9a<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">context<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">fillRect<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #F78C6C\">50<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">50<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">200<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">200<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Canvas\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001Canvas\u30bf\u30b0\u3092 body\u30bf\u30b0\u5185\u306e\u4efb\u610f\u306e\u5834\u6240\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002<br>width\u5c5e\u6027\u3068height\u5c5e\u6027\u3067\u6307\u5b9a\u3057\u305f\u6570\u5024\u304c\u3001Canvas\u306e\u30b5\u30a4\u30ba\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u901a\u5e38\u3001\u8981\u7d20\u306b\u95a2\u3059\u308b\u30b5\u30a4\u30ba\u6307\u5b9a\u306a\u3069\u306fHTML\u3084CSS\u5074\u3067\u884c\u3044\u307e\u3059\u304c\u3001Canvas\u3067\u63cf\u753b\u3059\u308b\u753b\u50cf\u306e\u8abf\u6574\u306f JavaScript\u3067\u884c\u3044\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u307e\u305a\u306f\u753b\u50cf\u3092\u63cf\u753b\u3059\u308b\u524d\u306b\u3001\u8981\u7d20\u3068\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3068\u306f\u3001\u753b\u50cf\u306a\u3069\u3092\u63cf\u753b\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3084\u3001\u8272\u3084\u900f\u660e\u5ea6\u306a\u3069\u306e\u60c5\u5831\u306b\u95a2\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u307e\u3068\u3081\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<br>getContext\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5bfe\u8c61\u306e\u8981\u7d20\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u305d\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u57fa\u306b\u753b\u50cf\u306e\u63cf\u753b\u4f4d\u7f6e\u306a\u3069\u3092\u8abf\u6574\u3057\u3066 Canvas\u4e0a\u306b\u63cf\u753b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u753b\u50cf\u306e\u63cf\u753b\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001\u5148\u307b\u3069\u3068\u540c\u3058\u3088\u3046\u306b createObjectURL\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u30ea\u30f3\u30af\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>URL\u3092\u751f\u6210\u3059\u308b\u306b\u3042\u305f\u3063\u3066\u3001\u753b\u50cf\u30c7\u30fc\u30bf\u3092 Blob\u306b\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001Canvas\u306b\u306f Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308b toBlob()\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">HTML<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>&lt;a class=\"downloadImage\" download=\"sampleImage.jpg\">\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9&lt;\/a><\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #89DDFF\">&lt;<\/span><span style=\"color: #F07178\">a<\/span><span style=\"color: #89DDFF\"> <\/span><span style=\"color: #C792EA\">class<\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">downloadImage<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\"> <\/span><span style=\"color: #C792EA\">download<\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">sampleImage.jpg<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\">&gt;<\/span><span style=\"color: #EEFFFF\">\u753b\u50cf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/span><span style=\"color: #89DDFF\">&lt;\/<\/span><span style=\"color: #F07178\">a<\/span><span style=\"color: #89DDFF\">&gt;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>const dlLink = document.querySelector('.downloadImage');\n\ncanvas.toBlob(function(blob) {\n  dlLink.href = URL.createObjectURL(blob);\n});<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> dlLink <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> document<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">querySelector<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">.downloadImage<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">canvas<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">toBlob<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #C792EA\">function<\/span><span style=\"color: #89DDFF\">(<\/span><span style=\"color: #EEFFFF; font-style: italic\">blob<\/span><span style=\"color: #89DDFF\">)<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F07178\">  <\/span><span style=\"color: #EEFFFF\">dlLink<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #EEFFFF\">href<\/span><span style=\"color: #F07178\"> <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #F07178\"> <\/span><span style=\"color: #EEFFFF\">URL<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">createObjectURL<\/span><span style=\"color: #F07178\">(<\/span><span style=\"color: #EEFFFF\">blob<\/span><span style=\"color: #F07178\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #89DDFF\">}<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u63cf\u753b\u3057\u305f\u753b\u50cf\u304c\u7121\u4e8b\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u308c\u3070 OK\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">Blob\u3068Base64\u3092\u5909\u63db\u3059\u308b<\/h2>\n\n\n\n<p>Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001base64\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<br>Blob\u5185\u306e\u30c7\u30fc\u30bf\u3092 base64\u5f62\u5f0f\u306e\u6587\u5b57\u5217\u3067\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306f\u3001FileReader\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e readAsBinaryString\u30e1\u30bd\u30c3\u30c9\u3067\u30d0\u30a4\u30ca\u30ea\u30fc\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u305f\u5f8c\u3001btoa\u95a2\u6570\u3067 base64\u5f62\u5f0f\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3059\u308b\u3053\u3068\u3067\u53d6\u5f97\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>const blob = new Blob(&#91;'Hello world!'&#93;, {type:\"text\/plain\"});\nconst reader = new FileReader();\n\nreader.onload = function() {\n  \/\/ base64\u5f62\u5f0f\u306e\u6587\u5b57\u5217\u306b\u5909\u63db\n   const base64 = btoa(reader.result);\n   console.log(base64);\n};\n\nreader.readAsBinaryString(blob);<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> blob <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">Blob<\/span><span style=\"color: #EEFFFF\">(&#91;<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">Hello world!<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">&#93;<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><span style=\"color: #F07178\">type<\/span><span style=\"color: #89DDFF\">:<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">text\/plain<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\">}<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> reader <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">FileReader<\/span><span style=\"color: #EEFFFF\">()<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">reader<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">onload<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #C792EA\">function<\/span><span style=\"color: #89DDFF\">()<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #89DDFF\">  <\/span><span style=\"color: #546E7A; font-style: italic\">\/\/ base64\u5f62\u5f0f\u306e\u6587\u5b57\u5217\u306b\u5909\u63db<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F07178\">   <\/span><span style=\"color: #C792EA\">const<\/span><span style=\"color: #F07178\"> <\/span><span style=\"color: #EEFFFF\">base64<\/span><span style=\"color: #F07178\"> <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #F07178\"> <\/span><span style=\"color: #82AAFF\">btoa<\/span><span style=\"color: #F07178\">(<\/span><span style=\"color: #EEFFFF\">reader<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #EEFFFF\">result<\/span><span style=\"color: #F07178\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F07178\">   <\/span><span style=\"color: #EEFFFF\">console<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">log<\/span><span style=\"color: #F07178\">(<\/span><span style=\"color: #EEFFFF\">base64<\/span><span style=\"color: #F07178\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #89DDFF\">};<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">reader<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">readAsBinaryString<\/span><span style=\"color: #EEFFFF\">(blob)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">\u5b9f\u884c\u7d50\u679c<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>SGVsbG8gd29ybGQh<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #EEFFFF\">SGVsbG8gd29ybGQh<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">Base64\u306e\u6587\u5b57\u5217\u3092Blob\u306b\u5909\u63db\u3059\u308b<\/h2>\n\n\n\n<p>\u53cd\u5bfe\u306b\u3001base64\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092 Blob\u306b\u5909\u63db\u3059\u308b\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u51e6\u7406\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Base64\u6587\u5b57\u5217\u3092\u30d0\u30a4\u30ca\u30ea\u30fc\u6587\u5b57\u5217\u306b\u5909\u63db<\/li>\n\n\n\n<li>Uint8Array\u578b\u306e\u914d\u5217\u3092\u4f5c\u6210<\/li>\n\n\n\n<li>\u30d0\u30a4\u30ca\u30ea\u30fc\u6587\u5b57\u5217\u3092 UTF-16\u306b\u5909\u63db\u3057\u3066\u914d\u5217\u306b\u683c\u7d0d<\/li>\n\n\n\n<li>\u6587\u5b57\u5217\u3092\u683c\u7d0d\u3057\u305f\u914d\u5217\u3092 Blob\u306b\u5909\u63db<\/li>\n<\/ol>\n\n\n\n<p>\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(14px, .875rem, 21px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(20px, 1.25rem, 30px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:flex;align-items:center;padding:10px 0px 10px 16px;margin-bottom:-2px;width:100%;text-align:left;background-color:#304047;color:#d5ffff\">JavaScript<\/span><span role=\"button\" tabindex=\"0\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>\/\/ \u30d0\u30a4\u30ca\u30ea\u30fc\u6587\u5b57\u5217\u306b\u5909\u63db\nconst bin = atob(base64.replace(\/^.*,\/, ''));\n\n\/\/ \u914d\u5217\u3092\u4f5c\u6210\u3057\u3001UTF-16\u306b\u5909\u63db\u3057\u305f\u6587\u5b57\u5217\u3092\u683c\u7d0d\nconst buffer = new Uint8Array(bin.length).map((_, i) => bin.charCodeAt(i));\n\n\/\/ \u914d\u5217\u3092 Blob\u306b\u5909\u63db\nconst blob = new Blob(&#91;buffer.buffer&#93;, {type:\"text\/plain\"});<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M4.5 12.75l6 6 9-13.5\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M16.5 8.25V6a2.25 2.25 0 00-2.25-2.25H6A2.25 2.25 0 003.75 6v8.25A2.25 2.25 0 006 16.5h2.25m8.25-8.25H18a2.25 2.25 0 012.25 2.25V18A2.25 2.25 0 0118 20.25h-7.5A2.25 2.25 0 018.25 18v-1.5m8.25-8.25h-6a2.25 2.25 0 00-2.25 2.25v6\"><\/path><\/svg><\/span><pre class=\"shiki material-theme\" style=\"background-color: #263238\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #546E7A; font-style: italic\">\/\/ \u30d0\u30a4\u30ca\u30ea\u30fc\u6587\u5b57\u5217\u306b\u5909\u63db<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> bin <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">atob<\/span><span style=\"color: #EEFFFF\">(base64<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">replace<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #89DDFF\">\/<\/span><span style=\"color: #89DDFF; font-style: italic\">^<\/span><span style=\"color: #C3E88D\">.<\/span><span style=\"color: #89DDFF\">*<\/span><span style=\"color: #C3E88D\">,<\/span><span style=\"color: #89DDFF\">\/<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">&#39;&#39;<\/span><span style=\"color: #EEFFFF\">))<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #546E7A; font-style: italic\">\/\/ \u914d\u5217\u3092\u4f5c\u6210\u3057\u3001UTF-16\u306b\u5909\u63db\u3057\u305f\u6587\u5b57\u5217\u3092\u683c\u7d0d<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> buffer <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">Uint8Array<\/span><span style=\"color: #EEFFFF\">(bin<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #EEFFFF\">length)<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">map<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #89DDFF\">(<\/span><span style=\"color: #EEFFFF; font-style: italic\">_<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #EEFFFF; font-style: italic\">i<\/span><span style=\"color: #89DDFF\">)<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #C792EA\">=&gt;<\/span><span style=\"color: #EEFFFF\"> bin<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #82AAFF\">charCodeAt<\/span><span style=\"color: #EEFFFF\">(i))<\/span><span style=\"color: #89DDFF\">;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #546E7A; font-style: italic\">\/\/ \u914d\u5217\u3092 Blob\u306b\u5909\u63db<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C792EA\">const<\/span><span style=\"color: #EEFFFF\"> blob <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">new<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">Blob<\/span><span style=\"color: #EEFFFF\">(&#91;buffer<\/span><span style=\"color: #89DDFF\">.<\/span><span style=\"color: #EEFFFF\">buffer&#93;<\/span><span style=\"color: #89DDFF\">,<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">{<\/span><span style=\"color: #F07178\">type<\/span><span style=\"color: #89DDFF\">:<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #C3E88D\">text\/plain<\/span><span style=\"color: #89DDFF\">&quot;<\/span><span style=\"color: #89DDFF\">}<\/span><span style=\"color: #EEFFFF\">)<\/span><span style=\"color: #89DDFF\">;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>UTF-16\u3078\u306e\u5909\u63db\u306f for\u6587\u3067\u3082\u5b9f\u884c\u53ef\u80fd\u3067\u3059\u304c\u3001map\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3088\u308a\u7c21\u6f54\u306b\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__7\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001JavaScript\u3067 Blob\u3092\u6271\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<br>\u30d5\u30a1\u30a4\u30eb\u64cd\u4f5c\u306a\u3069\u3092\u983b\u7e41\u306b\u884c\u3046\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u5834\u5408\u306b\u306f\u3001\u7279\u306b\u91cd\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306a\u3063\u3066\u304f\u308b\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u3068\u4f7f\u3044\u65b9\u3092\u628a\u63e1\u3057\u3066\u304a\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__8\" class=\"wp-block-heading\">JavaScript\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n<p>\u66f8\u7c4d\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u5b66\u7fd2\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u6628\u4eca\u3067\u306f\u3001YouTube\u306a\u3069\u306e\u52d5\u753b\u30b5\u30a4\u30c8\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30b5\u30a4\u30c8\u306a\u3069\u3082\u5145\u5b9f\u3057\u3066\u3044\u3066\u591a\u304f\u306e\u60c5\u5831\u304c\u624b\u306b\u5165\u308a\u307e\u3059\u3002<br \/>\u305d\u3057\u3066\u3001\u3088\u308a\u52b9\u7387\u7684\u306b\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3059\u308b\u306b\u306f\u3001\u77e5\u8b58\u3092\u3064\u3051\u306a\u304c\u3089\u5b9f\u969b\u306b\u624b\u3092\u52d5\u304b\u3057\u3066\u307f\u308b\u306a\u3069\u3001\u30a4\u30f3\u30d7\u30c3\u30c8\u3068\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u7279\u306b\u72ec\u5b66\u306e\u5834\u5408\u306f\u3001\u6709\u8b58\u8005\u306b\u8cea\u554f\u304c\u3067\u304d\u305f\u308a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u3082\u3089\u3048\u308b\u3088\u3046\u306a\u74b0\u5883\u304c\u3042\u308b\u3068\u3001\u7406\u89e3\u5ea6\u304c\u6df1\u307e\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u305f\u3060\u3001JavaScript\u306b\u9650\u3089\u305a\u3001IT\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u969b\u3001\u3069\u3046\u3057\u3066\u3082\u8ab2\u984c\u306b\u3076\u3064\u304b\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u7279\u306b\u72ec\u5b66\u3060\u3068\u3001\u308f\u304b\u3089\u306a\u3044\u90e8\u5206\u3092\u30d7\u30ed\u306b\u8cea\u554f\u3067\u304d\u308b\u6a5f\u4f1a\u3092\u78ba\u4fdd\u3057\u306b\u304f\u304f\u3001\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u304c\u7d9a\u304d\u306b\u304f\u3044\u3068\u3044\u3046\u5074\u9762\u304c\u3042\u308a\u307e\u3059\u3002\u72ec\u5b66\u3067\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u3092\u7dad\u6301\u3059\u308b\u81ea\u4fe1\u304c\u306a\u3044\u4eba\u306b\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3068\u3044\u3046\u624b\u3082\u3042\u308a\u307e\u3059\u3002\u8cbb\u7528\u306f\u639b\u304b\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u5206\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u3084\u3059\u3044\u3067\u3059\u3002\u3057\u3063\u304b\u308a\u3068\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3057\u3066\u5b9f\u8df5\u306b\u6d3b\u304b\u3057\u305f\u3044\u3068\u3044\u3046\u4eba\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<p><span class=\"markerYellow\"><strong>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306a\u3089\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u304c\u304a\u3059\u3059\u3081\uff01<\/strong><\/span><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/yuudou.png\" alt=\"\" class=\"post-img\" loading=\"lazy\">\n\n\n<p>IT\u30b9\u30ad\u30eb\u9700\u8981\u306e\u9ad8\u307e\u308a\u3068\u3068\u3082\u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3082\u5897\u3048\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3069\u306e\u30b9\u30af\u30fc\u30eb\u306b\u901a\u3046\u3079\u304d\u304b\u8ff7\u3063\u3066\u3057\u307e\u3046\u4eba\u3082\u3044\u308b\u3067\u3057\u3087\u3046\u3002\u305d\u3093\u306a\u65b9\u306b\u306f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\uff01\u3053\u308c\u307e\u3067\u591a\u304f\u306eIT\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u80b2\u6210\u30fb\u8f29\u51fa\u3057\u3066\u304d\u305f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3092\u958b\u8b1b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"bgBox\">\n<p><strong>\uff1c\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306e\u7279\u5fb4\uff1e<\/strong><br \/><strong>\u30fb\u305f\u3057\u304b\u306a\u80b2\u6210\u5b9f\u7e3e\u3068\u89aa\u8eab\u306a\u6559\u80b2\u3000\uff5e\u30bb\u30ab\u30f3\u30c9\u30ad\u30e3\u30ea\u30a2\u3092\u5168\u529b\u652f\u63f4\uff5e<\/strong><br \/><strong>\u30fb\u8b1b\u5e2b\u304c\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u3000\uff5e\u201c\u672c\u5f53\u201d\u306e\u958b\u767a\u30ce\u30a6\u30cf\u30a6\u3092\u76f4\u306b\u5b66\u3079\u308b\uff5e<\/strong><br \/><strong>\u30fb\u5c02\u5c5e\u8b1b\u5e2b\u304c\u5b66\u7fd2\u3092\u5fb9\u5e95\u30b5\u30dd\u30fc\u30c8\u3000\uff5e\u300c\u308f\u304b\u3089\u306a\u3044\u300d\u3092\u5fb9\u5e95\u89e3\u6c7a\uff5e<\/strong><br \/><strong>\u30fb\u5b9f\u52d9\u30d9\u30fc\u30b9\u3067\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3000\uff5e\u5b9f\u8df5\u7684\u306a\u51dd\u7e2e\u30ab\u30ea\u30ad\u30e5\u30e9\u30e0\uff5e<\/strong><\/p>\n<\/div>\n<p>\u3053\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3064\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306fIT\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b9\u30bf\u30fc\u30c8\u30e9\u30a4\u30f3\u3068\u3057\u3066\u6700\u9069\u3067\u3059\u3002<br \/>\u8a71\u3092\u805e\u304d\u305f\u3044\u30fb\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u3068\u3044\u3046\u65b9\u306f<a href=\"https:\/\/techmania.jp\/lp\/2\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089<\/a>\u304b\u3089\u304a\u6c17\u8efd\u306b\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002<\/p>","protected":false},"excerpt":{"rendered":"JavaScript\u3067\u306f\u3001\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3092\u6271\u3048\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e1\u3064\u306b Blob\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u69d8\u3005\u306a\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046\u904e\u7a0b\u3067\u6d3b\u7528\u3055\u308c\u3066\u3044\u308b\u3001\u4e3b\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e1\u3064\u3067\u3059\u3002 \u4eca\u56de\u306f\u3001JavaScript\u3067 Blob\u3092\u6271\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002 Blob\u3068\u306f\uff1f Blob\u3068\u306f\u3001JavaScript\u3067\u4f7f\u7528\u53ef\u80fd\u306a Web API\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\uff09\u306e\u4e00\u7a2e\u3067\u3059\u3002\u6b63\u5f0f\u306b [&hellip;]","protected":false},"author":11,"featured_media":10249,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/web-img.rensa.jp.net\/images\/techmania\/thumbnail\/images\/javascript-blob.webp","fifu_image_alt":"\u3010JavaScript\u5165\u9580\u3011Blob\u306e\u4f7f\u3044\u65b9\u30fb\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u306e\u65b9\u6cd5","footnotes":""},"categories":[15],"tags":[],"class_list":["post-10245","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming"],"_links":{"self":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/10245","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/comments?post=10245"}],"version-history":[{"count":3,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/10245\/revisions"}],"predecessor-version":[{"id":10248,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/10245\/revisions\/10248"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media\/10249"}],"wp:attachment":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media?parent=10245"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/categories?post=10245"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/tags?post=10245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}