{"id":10128,"date":"2025-12-19T16:45:59","date_gmt":"2025-12-19T07:45:59","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=10128"},"modified":"2025-12-19T16:46:01","modified_gmt":"2025-12-19T07:46:01","slug":"javascript-promise","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/javascript-promise\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011Promise\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u30b9\u30de\u30fc\u30c8\u306b\u5b9f\u88c5\u3059\u308b"},"content":{"rendered":"\n<p>JavaScript\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u3068\u4fbf\u5229\u306a\u306e\u304c\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002<br>Promise\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u4f7f\u3063\u3066\u8a18\u8ff0\u3059\u308b\u3088\u308a\u3082\u7c21\u6f54\u306b\u30b3\u30fc\u30c9\u3092\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4eca\u56de\u306f\u3001Promise\u3092\u4f7f\u7528\u3057\u3066\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\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\">Promise\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>Promise\u306f\u3001JavaScript\u3067\u751f\u6210\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e00\u7a2e\u3067\u3059\u3002<br>\u975e\u540c\u671f\u51e6\u7406\u306e\u5b9f\u88c5\u6642\u306b\u4f7f\u7528\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3001\u5f15\u6570\u306b\u6e21\u3057\u305f\u95a2\u6570\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u305f\u969b\u306b\u3001\u51e6\u7406\u304c\u6210\u529f\u3057\u305f\u304b\u5426\u304b\u3092\u7d50\u679c\u3068\u3057\u3066\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u308c\u305e\u308c\u5bfe\u5fdc\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u53d6\u5f97\u7d50\u679c\u306b\u5fdc\u3058\u3066\u5b9f\u884c\u3059\u308b\u51e6\u7406\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__1_1\" class=\"wp-block-heading\">\u540c\u671f\u51e6\u7406\u3068\u975e\u540c\u671f\u51e6\u7406<\/h3>\n\n\n\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306f\u57fa\u672c\u7684\u306b\u3001\u4e0a\u304b\u3089\u4e0b\u3078\u3068\u8a18\u8ff0\u3057\u305f\u9806\u306b\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3001\u8a18\u8ff0\u3057\u305f\u5185\u5bb9\u306e\u51e6\u7406\u304c\u5168\u3066\u5b8c\u4e86\u3057\u3066\u304b\u3089\u6b21\u306e\u884c\u306e\u51e6\u7406\u3078\u3068\u79fb\u884c\u3057\u307e\u3059\u3002<br>\u3053\u306e\u3088\u3046\u306a\u51e6\u7406\u306e\u6d41\u308c\u3092\u3001\u540c\u671f\u51e6\u7406\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3067\u3001\u305d\u306e\u884c\u306b\u66f8\u304b\u308c\u305f\u51e6\u7406\u5185\u5bb9\u304c\u5b8c\u4e86\u3059\u308b\u306e\u3092\u5f85\u3064\u3053\u3068\u306a\u304f\u3001\u6b21\u306e\u884c\u3078\u3068\u51e6\u7406\u3092\u79fb\u884c\u3055\u305b\u308b\u30b1\u30fc\u30b9\u3082\u4e2d\u306b\u306f\u5b58\u5728\u3057\u307e\u3059\u3002<br>\u3053\u3046\u3057\u305f\u51e6\u7406\u306f\u53cd\u5bfe\u306b\u3001\u975e\u540c\u671f\u51e6\u7406\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u975e\u540c\u671f\u51e6\u7406\u306f\u3001\u4e3b\u306b\u30c7\u30fc\u30bf\u901a\u4fe1\u306a\u3069\u306e\u6642\u9593\u304c\u304b\u304b\u308a\u3084\u3059\u3044\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u51e6\u7406\u65b9\u6cd5\u3067\u3059\u3002<br>\u540c\u671f\u51e6\u7406\u306e\u5834\u5408\u3001\u7279\u5b9a\u306e\u51e6\u7406\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u3068\u5fc5\u7136\u7684\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u306e\u51e6\u7406\u3082\u6b62\u307e\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u975e\u540c\u671f\u51e6\u7406\u3067\u3042\u308c\u3070\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u9032\u884c\u3092\u6b62\u3081\u308b\u3053\u3068\u306a\u304f\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__1_2\" class=\"wp-block-heading\">JavaScript\u306b\u304a\u3051\u308b\u300c\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344\u300d<\/h3>\n\n\n\n<p>\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u3088\u304f\u9665\u308a\u3084\u3059\u3044\u306e\u304c\u3001\u300c\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344\u300d \u3068\u547c\u3070\u308c\u308b\u73fe\u8c61\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307b\u3068\u3093\u3069\u306e\u975e\u540c\u671f\u51e6\u7406\u3067\u306f\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<br>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3068\u306f\u3001\u95a2\u6570\u3084\u30e1\u30bd\u30c3\u30c9\u306b\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u3001\u6e21\u3057\u305f\u5148\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067\u547c\u3073\u51fa\u3055\u308c\u308b\u95a2\u6570\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<br>\u3053\u308c\u306b\u3088\u308a\u3001\u4f8b\u3048\u3070\u901a\u4fe1\u51e6\u7406\u3067\u53d7\u3051\u53d6\u3063\u305f\u5185\u5bb9\u3092\u753b\u9762\u306b\u63cf\u5199\u3059\u308b\u3068\u3044\u3063\u305f\u3088\u3046\u306a\u3001\u7279\u5b9a\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u305f\u5f8c\u306b\u5b9f\u884c\u3059\u308b\u51e6\u7406\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3067\u3059\u304c\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u4f7f\u7528\u3059\u308b\u969b\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u3068\u3057\u3066\u3001\u30b3\u30fc\u30c9\u304c\u8907\u96d1\u5316\u3057\u3084\u3059\u3044\u3068\u3044\u3046\u96e3\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunc(num, callback) {\n    setTimeout(() =&gt; {\n        callback(num * 10);\n    }, Math.random() * 1000);\n}\n\nfunction sampleCallback() {\n    sampleFunc(5, (result) =&gt; {\n        console.log(result);                  \n        sampleFunc(result, (result) =&gt; {\n            console.log(result);              \n            sampleFunc(result, (result) =&gt; {\n                console.log(result);          \n            });\n        });\n    });\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u30b3\u30fc\u30c9\u3068\u3057\u3066\u306f\u3001sampleFunc\u3068\u3044\u3046\u975e\u540c\u671f\u51e6\u7406\u3092\u884c\u3046\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u3001\u5f15\u6570\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u5185\u3067\u9023\u7d9a\u3057\u3066\u547c\u3073\u51fa\u3059\u3060\u3051\u3068\u3044\u3046\u7c21\u5358\u306a\u3082\u306e\u3067\u3059\u3002<br>\u3068\u3053\u308d\u304c\u3001\u8996\u899a\u7684\u306b\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u308b\u3068\u3001\u7c21\u5358\u306a\u5185\u5bb9\u3067\u3042\u308b\u306b\u3082\u95a2\u308f\u3089\u305a\u77ac\u6642\u306b\u7406\u89e3\u3059\u308b\u306e\u304c\u96e3\u3057\u3044\u30b3\u30fc\u30c9\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306e\u30cd\u30b9\u30c8\u304c\u6df1\u304f\u306a\u308b\u3053\u3068\u3067\u53ef\u8aad\u6027\u304c\u4e0b\u304c\u3063\u3066\u3057\u307e\u3046\u73fe\u8c61\u306e\u3053\u3068\u3092\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344\u3068\u547c\u3073\u307e\u3059\u3002<br>Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u3053\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344\u3092\u89e3\u6d88\u3059\u308b\u305f\u3081\u306e\u8a18\u8ff0\u65b9\u6cd5\u306e\uff11\u3064\u3068\u3057\u3066\u6d3b\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">Promise\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5b9f\u969b\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3001\u9806\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\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>Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u5f62\u5f0f\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const samplePromise = new Promise((resolve, reject) =&gt; {\n\t\/\/\u51e6\u7406\u5185\u5bb9;\n});<\/code><\/pre><\/div>\n\n\n\n<p>Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3001\u300cPromiseStatus\u300d\u3068\u3044\u3046\u51e6\u7406\u72b6\u614b\u3092\u8868\u3059\u30b9\u30c6\u30fc\u30bf\u30b9\u304c\u3042\u308a\u3001\u4ee5\u4e0b\u306e3\u3064\u306e\u3046\u3061\u306e\u3044\u305a\u308c\u304b\u3067\u95a2\u6570\u306e\u51e6\u7406\u72b6\u614b\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pending: \u672a\u89e3\u6c7a\uff08\u51e6\u7406\u4e2d\uff09<\/li>\n\n\n\n<li>fulfilled: \u89e3\u6c7a\u6e08\u307f\uff08\u51e6\u7406\u304c\u6210\u529f\u3057\u305f\u72b6\u614b\uff09<\/li>\n\n\n\n<li>rejected: \u62d2\u5426\uff08\u51e6\u7406\u304c\u5931\u6557\u3057\u305f\u72b6\u614b\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u6642\u306e\u72b6\u614b\u306f pending\u3067\u3059\u3002<br>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u6e21\u3059\u95a2\u6570\u306e\u5f15\u6570\u306b\u306f\u3001resolve\u3068 reject \u306e2\u3064\u306e\u95a2\u6570\u3092\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u3001resolve \u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3067 fulfilled\u306b\u3001reject\u306e\u5834\u5408\u306f rejected \u306b\u72b6\u614b\u3092\u79fb\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const samplePromise = new Promise((resolve, reject) =&gt; {\n\tif (Math.random() &lt; 0.5) {\n\t\t\/\/ fulfilled\u306b\u79fb\u884c\n\t\tresolve();\n\t} else {\n\t\t\/\/ resolved\u306b\u79fb\u884c\n\t\treject(&quot;);\n\t}\n});<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">Promise.then() \u3092\u4f7f\u3063\u3066\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b<\/h3>\n\n\n\n<p>Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u901a\u5e38\u306e\u975e\u540c\u671f\u51e6\u7406\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3068\u540c\u3058\u52d5\u4f5c\u3092\u3055\u305b\u305f\u3044\u5834\u5408\u306b\u306f\u3001then\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br>then\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5bfe\u8c61\u306ePromise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u304c fulfilled\u3001\u3082\u3057\u304f\u306f rejected\u306b\u79fb\u884c\u3057\u305f\u6bb5\u968e\u3067\u3001\u6307\u5b9a\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f62\u5f0f\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>samplePromise.then(\n\tfunction(data) {\n            \/\/ Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c fulfilled \u306e\u5834\u5408\u306e\u51e6\u7406;\n        },\n        function(error) {\n            \/\/ Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c rejected \u306e\u5834\u5408\u306e\u51e6\u7406;\n        },\n);<\/code><\/pre><\/div>\n\n\n\n<p>then\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u30012\u3064\u306e\u5f15\u6570\u3092\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u7b2c\uff11\u5f15\u6570\u306b\u306f\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u304c fulfilled\u306e\u5834\u5408\u306b\u5b9f\u884c\u3059\u308b\u95a2\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<br>\u53cd\u5bfe\u306b\u3001\u7b2c\uff12\u5f15\u6570\u306b\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u304c rejected\u306e\u5834\u5408\u306b\u5b9f\u884c\u3059\u308b\u95a2\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001resolve\u95a2\u6570 \u3084 reject\u95a2\u6570\u306e\u5b9f\u884c\u6642\u306b\u5024\u3092\u6e21\u3059\u3053\u3068\u3067\u3001\u305d\u308c\u305e\u308c\u306e\u95a2\u6570\u306e\u5f15\u6570\u3068\u3057\u3066\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function samplePromise(){\n    \n    return new Promise(function(resolve, reject){\n\n        const num = Math.random();\n    \n    \tif (num &lt; 0.5) {\n    \t\tresolve(num);\n    \t} else {\n    \t\treject(num);\n    \t}\n    });\n}\n\nsamplePromise()\n    .then(\n    \tfunction(data)  {\n            console.log(&quot;success:&quot;, data);\n        },\n        function(error)  {\n            console.log(&quot;error:&quot;, error);\n        },\n    );<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>success: 0.4786429022064871<\/code><\/pre><\/div>\n\n\n\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u5b9f\u969b\u306b\u52d5\u304b\u3057\u3066\u307f\u308b\u3068\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u95a2\u6570\u5185\u3067\u751f\u6210\u3055\u308c\u305f num\u306e\u5024\u304c then\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br>\u3053\u306e\u3088\u3046\u306b\u3001\u5404\u95a2\u6570\u306e\u5f15\u6570\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u51e6\u7406\u7d50\u679c\u3092 Promise\u304b\u3089 then\u30e1\u30bd\u30c3\u30c9\u3078\u3068\u5f15\u304d\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_3\" class=\"wp-block-heading\">Promise.catch() \u3092\u4f7f\u3063\u3066\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b<\/h3>\n\n\n\n<p>\u5148\u307b\u3069\u3082\u89e3\u8aac\u3057\u305f\u3088\u3046\u306b\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u95a2\u6570\u304c\u5931\u6557\uff08rejected\uff09\u3060\u3063\u305f\u5834\u5408\u306b\u5b9f\u884c\u3059\u308b\u51e6\u7406\u306f\u3001then\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c\uff12\u5f15\u6570\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3067\u3059\u304c\u305d\u306e\u4ed6\u306b\u3082\u3001\u5931\u6557\u3057\u305f\u969b\u306b\u5b9f\u884c\u3059\u308b\u51e6\u7406\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<br>\u305d\u308c\u304c\u3001catch\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>samplePromise()\n    .then(\n    \tfunction(data) {\n            console.log(&quot;success:&quot;, data);\n            return data;\n        }\n    )\n    .catch(\n        function(error) {\n            console.log(&quot;error:&quot;, error);\n        }\n    );<\/code><\/pre><\/div>\n\n\n\n<p>catch\u30e1\u30bd\u30c3\u30c9\u306f\u3001reject\u95a2\u6570\u306e\u5b9f\u884c\u6642\u3060\u3051\u3067\u306a\u304f\u3001\u30a8\u30e9\u30fc\u767a\u751f\u6642\u3084 throw\u3092\u6295\u3052\u305f\u969b\u306b\u3082\u4f8b\u5916\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function samplePromise() {\n    return new Promise(function() {\n        throw new Error(&quot;\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f&quot;);\n    });\n}\n\nsamplePromise()\n    .then(\n    \tfunction(data) {\n            console.log(&quot;success:&quot;, data);\n            return data;\n        }\n    )\n    .catch(\n        function(error) {\n            console.log(error);\n        }\n    );<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>Error: \u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\n    at \/tmp\/main.js:3:15\n    at new Promise (&lt;anonymous&gt;)\n    at samplePromise (\/tmp\/main.js:2:12)\n    at Object.&lt;anonymous&gt; (\/tmp\/main.js:7:1)\n    at Module._compile (node:internal\/modules\/cjs\/loader:1376:14)\n    at Module._extensions..js (node:internal\/modules\/cjs\/loader:1435:10)\n    at Module.load (node:internal\/modules\/cjs\/loader:1207:32)\n    at Module._load (node:internal\/modules\/cjs\/loader:1023:12)\n    at Function.executeUserEntryPoint [as runMain] (node:internal\/modules\/run_main:135:12)\n    at node:internal\/main\/run_main_module:28:49<\/code><\/pre><\/div>\n\n\n\n<p>catch\u30e1\u30bd\u30c3\u30c9\u3068\u540c\u69d8\u306e\u52d5\u304d\u3092 then\u30e1\u30bd\u30c3\u30c9\u3067\u5b9f\u88c5\u3059\u308b\u3053\u3068\u306f\u4e0d\u53ef\u80fd\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u306b\u3088\u308a\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u8996\u899a\u7684\u306b\u3082\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002<br>\u57fa\u672c\u7684\u306b\u306f\u3001\u6210\u529f\u51e6\u7406\u306f then\u30e1\u30bd\u30c3\u30c9\u3001\u5931\u6557\u51e6\u7406\u306f catch\u30e1\u30bd\u30c3\u30c9\u3067\u8a18\u8ff0\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">Promise\u3092\u30c1\u30a7\u30fc\u30f3\u3057\u3066\u51e6\u7406\u3092\u9023\u7d50\u3059\u308b<\/h2>\n\n\n\n<p>Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u8907\u6570\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u540c\u671f\u7684\u306b\u7e4b\u3052\u3066\u51e6\u7406\u3057\u305f\u308a\u3001\u3059\u3079\u3066\u306e\u51e6\u7406\u3092\u4e26\u884c\u3057\u3066\u5b9f\u884c\u3057\u7d42\u3048\u305f\u5f8c\u306b\u7279\u5b9a\u306e\u51e6\u7406\u3092\u884c\u308f\u305b\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<br>\u305d\u308c\u305e\u308c\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">Promise\u51e6\u7406\u3092\u9023\u7d50\u3059\u308b<\/h3>\n\n\n\n<p>then\u30e1\u30bd\u30c3\u30c9\u3084 catch\u30e1\u30bd\u30c3\u30c9\u306f\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u623b\u308a\u5024\u3068\u3057\u3066\u8fd4\u3059\u305f\u3081\u3001\u9023\u7d9a\u3057\u3066\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function samplePromise() {   \n    return new Promise(resolve =&gt; resolve(Math.floor(Math.random() * 10)));\n}\n\nsamplePromise()\n    .then(\n    \tfunction(data) {\n            console.log(&quot;success1:&quot;, data);\n            return data * 10;\n        }\n    )\n    .then(\n    \tfunction(data) {\n            console.log(&quot;success2:&quot;, data);\n            return data * 10;\n        }\n    )\n    .then(\n    \tfunction(data) {\n            console.log(&quot;success3:&quot;, data);\n        }\n    );<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>success1: 5\nsuccess2: 50\nsuccess3: 500<\/code><\/pre><\/div>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u3092\u9023\u7d9a\u3057\u3066\u7e4b\u3052\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u8907\u6570\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u540c\u671f\u7684\u306b\u5b9f\u884c\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4e0a\u8a18\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u3001\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u6307\u5b9a\u3057\u305f\u623b\u308a\u5024\u304c Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u4ee5\u5916\u306e\u30c7\u30fc\u30bf\u578b\u3067\u3042\u308b\u5834\u5408\u3082\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4fdd\u6301\u3059\u308b\u5024\u3068\u3057\u3066\u5185\u5305\u3055\u308c\u305f\u4e0a\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u8fd4\u5374\u3055\u308c\u308b\u305f\u3081\u3001\u9023\u7d9a\u3057\u3066\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_2\" class=\"wp-block-heading\">Promise.all() \u3067\u8907\u6570\u306ePromise\u3092\u9023\u7d50\u3059\u308b<\/h3>\n\n\n\n<p>\uff11\u3064\u306e\u975e\u540c\u671f\u51e6\u7406\u3067\u306f\u306a\u304f\u3001\u8907\u6570\u306e\u975e\u540c\u671f\u51e6\u7406\u304c\u3059\u3079\u3066\u5b8c\u4e86\u3057\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u7279\u5b9a\u306e\u51e6\u7406\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5148\u307b\u3069\u306e\u4f8b\u306f\u3042\u304f\u307e\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u9806\u306b\u884c\u3046\u65b9\u6cd5\u306e\u305f\u3081\u3001\u3059\u3079\u3066\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u306b\u306f\u6642\u9593\u304c\u304b\u304b\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br>\u4e0a\u8a18\u306e\u3088\u3046\u306a\u51e6\u7406\u3092\u5b9f\u88c5\u3057\u305f\u3044\u5834\u5408\u306f\u3001then\u30e1\u30bd\u30c3\u30c9\u3092\u30c1\u30a7\u30fc\u30f3\u3059\u308b\u65b9\u6cd5\u3067\u306f\u306a\u304f\u3001Promise.all\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3057\u3066\u5b9f\u88c5\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function samplePromise(time) {   \n    return new Promise(resolve =&gt; resolve(time + &quot;\u79d2&quot;), time * 1000);\n}\n\nPromise.all([\n  samplePromise(1),\n  samplePromise(3),\n  samplePromise(5)\n])\n.then(function(data) {\n  console.log(data);\n  console.log(&#39;\u3059\u3079\u3066\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u307e\u3057\u305f&#39;);\n});<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>[ &#39;1\u79d2&#39;, &#39;3\u79d2&#39;, &#39;5\u79d2&#39; ]\n\u3059\u3079\u3066\u306e\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u307e\u3057\u305f<\/code><\/pre><\/div>\n\n\n\n<p>Promise.all\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u5b9f\u884c\u5bfe\u8c61\u3068\u3059\u308b Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8981\u7d20\u3068\u3057\u3066\u683c\u7d0d\u3057\u305f\u914d\u5217\u3092\u5f15\u6570\u306b\u6e21\u3057\u307e\u3059\u3002<br>then\u30e1\u30bd\u30c3\u30c9\u3092\u7e4b\u3052\u3066\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u683c\u7d0d\u3057\u305f Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u51e6\u7406\u304c\u3059\u3079\u3066\u5b8c\u4e86\u3057\u305f\u6bb5\u968e\u3067\u6307\u5b9a\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>Promise.all\u30e1\u30bd\u30c3\u30c9\u3067\u51e6\u7406\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u3001resolve\u95a2\u6570\u306a\u3069\u306b\u6e21\u3057\u305f\u5024\u306f\u4e0a\u8a18\u306e\u7d50\u679c\u306e\u3088\u3046\u306b\u3001\u914d\u5217\u3068\u3057\u3066\u5168\u3066\u306e\u5024\u3092\u307e\u3068\u3081\u305f\u4e0a\u3067\u5f15\u304d\u6e21\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">Promise\u3067Ajax\u901a\u4fe1\u3092\u5b9f\u88c5\u3059\u308b<\/h2>\n\n\n\n<p>Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001Ajax\u901a\u4fe1\u3092\u884c\u3046\u969b\u306b\u4f7f\u7528\u3055\u308c\u308b Fetch API\u3068\u3082\u5bc6\u63a5\u306b\u95a2\u4fc2\u3057\u3066\u3044\u307e\u3059\u3002<br>\u7c21\u5358\u306a\u4f8b\u3092\u5143\u306b\u3001\u5b9f\u969b\u306e\u4f7f\u3044\u65b9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__4_1\" class=\"wp-block-heading\">fetch()\u306e\u7d50\u679c\u3092Promise\u3067\u53d7\u3051\u53d6\u308b<\/h3>\n\n\n\n<p>Fetch API\u3067\u30b5\u30fc\u30d0\u30fc\u30ea\u30af\u30a8\u30b9\u30c8\u3084\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u53d7\u3051\u53d6\u308a\u3092\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u306e\u304c\u3001fetch\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br>fetch\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u623b\u308a\u5024\u3067Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u305f\u3081\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306e\u4ee3\u308f\u308a\u306b then\u30e1\u30bd\u30c3\u30c9\u3084 catch\u30e1\u30bd\u30c3\u30c9\u3067\u30ec\u30b9\u30dd\u30f3\u30b9\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>fetch(&quot;https:\/\/example.com&quot;)\n  .then(response =&gt; response.json())\n  .then(data =&gt; console.log(data))\n  .catch(error =&gt; console.error(&quot;\u901a\u4fe1\u30a8\u30e9\u30fc:&quot;, error));<\/code><\/pre><\/div>\n\n\n\n<p>Promise\u3092\u30d9\u30fc\u30b9\u3068\u3057\u3066\u3044\u308b\u306e\u3067\u3001then\u30e1\u30bd\u30c3\u30c9\u3084 catch\u30e1\u30bd\u30c3\u30c9\u3060\u3051\u3067\u306a\u304f\u3001async\/await \u3082\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>async function getData() {\n  try {\n    const response = await fetch(&quot;https:\/\/example.com&quot;);\n    const data = await response.json();\n    console.log(data);\n  } catch (error) {\n    console.error(&quot;\u901a\u4fe1\u30a8\u30e9\u30fc:&quot;, error);\n  }\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u3088\u308a\u7c21\u5358\u306b\u30b5\u30fc\u30d0\u30fc\u901a\u4fe1\u3092\u884c\u3046\u65b9\u6cd5\u3068\u3057\u3066\u3001Fetch API \u3092\u4f7f\u7528\u3057\u3066\u975e\u540c\u671f\u51e6\u7406\u3092\u884c\u3046\u30b1\u30fc\u30b9\u304c\u591a\u304f\u3042\u308b\u306e\u3067\u3001\u5408\u308f\u305b\u3066\u899a\u3048\u3066\u304a\u304f\u3068\u3044\u3044\u6280\u8853\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">Promise\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3084\u4f8b\u5916\u51e6\u7406<\/h2>\n\n\n\n<p>Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u4f8b\u5916\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u3001\u65e2\u306b\u7d39\u4ecb\u3057\u305f catch\u30e1\u30bd\u30c3\u30c9\u306e\u4ed6\u306b\u3001try\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<br>\u8a73\u3057\u3044\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__5_1\" class=\"wp-block-heading\">Promise.try()\u3067try-catch\u4f8b\u5916\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b<\/h3>\n\n\n\n<p>try\u30e1\u30bd\u30c3\u30c9\u306f\u3001ES2025\u3067\u8ffd\u52a0\u3055\u308c\u305f\u65b0\u3057\u3044\u6a5f\u80fd\u306e\uff11\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5f93\u6765\u306eJavaScript\u3067\u306f\u3001\u540c\u671f\u51e6\u7406\u3068\u975e\u540c\u671f\u51e6\u7406\u306e\u4ed5\u69d8\u306e\u9055\u3044\u306b\u3088\u308a\u3001\u305d\u308c\u305e\u308c\u4f8b\u5916\u51e6\u7406\u306e\u8a18\u8ff0\u65b9\u6cd5\u3092\u5909\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u3002<br>\u4e00\u65b9\u3001\u3053\u306etry\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u540c\u671f\u30fb\u975e\u540c\u671f\u306b\u3088\u3063\u3066\u51e6\u7406\u3092\u5909\u3048\u308b\u3053\u3068\u306a\u304f\u3001\u4e00\u5f8b\u306bPromise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30d9\u30fc\u30b9\u3068\u3057\u305f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>try\u30e1\u30bd\u30c3\u30c9\u304c\u7279\u306b\u6709\u52b9\u7684\u306a\u306e\u306f\u3001\u540c\u671f\u51e6\u7406\u3068\u975e\u540c\u671f\u51e6\u7406\u304c\u540c\u3058\u30d6\u30ed\u30c3\u30af\u5185\u306b\u5b58\u5728\u3059\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002<br>\u3053\u308c\u307e\u3067\u306e\u5834\u5408\u306f\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u304b\u5426\u304b\u3067\u6761\u4ef6\u5206\u5c90\u3092\u884c\u3046\u3001\u3082\u3057\u304f\u306f\u540c\u671f\u30fb\u975e\u540c\u671f\u306b\u95a2\u308f\u3089\u305a Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u623b\u308a\u5024\u3092\u8fd4\u3059\u306a\u3069\u3057\u3066\u5bfe\u51e6\u3092\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>try {\n  const result = sampleFunc();\n  if (result instanceof Promise) {\n    result.catch(error =&gt; console.error(\u2018\u975e\u540c\u671f\u30a8\u30e9\u30fc:&#39;, error));\n  } else {\n    console.log(\u2018\u51e6\u7406\u7d50\u679c:&#39;, result);\n  }\n} catch (error) {\n  console.error(&#39;\u540c\u671f\u30a8\u30e9\u30fc:&#39;, error);\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306a\u65b9\u6cd5\u306e\u5834\u5408\u3001\u5fc5\u7136\u7684\u306b\u30b3\u30fc\u30c9\u304c\u8907\u96d1\u5316\u3057\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u53ef\u8aad\u6027\u3084\u76e3\u7406\u306e\u3057\u3084\u3059\u3055\u304c\u4e0b\u304c\u308b\u539f\u56e0\u3068\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br>try\u30e1\u30bd\u30c3\u30c9\u3067\u3042\u308c\u3070\u3001\u3053\u308c\u3089\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const syncFunc = () =&gt; {\n  return &quot;\u540c\u671f\u51e6\u7406&quot;;\n};\n\nconst asyncFunc = async () =&gt; {\n  return &quot;\u975e\u540c\u671f\u51e6\u7406&quot;;\n};\n\nPromise.try(syncFunc).then(console.log); \nPromise.try(asyncFunc).then(console.log); <\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>\u540c\u671f\u51e6\u7406\n\u975e\u540c\u671f\u51e6\u7406<\/code><\/pre><\/div>\n\n\n\n<p>\u51e6\u7406\u5185\u5bb9\u306e\u9055\u3044\u3092\u7279\u306b\u610f\u8b58\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u901a\u5e38\u901a\u308a\u306b\u95a2\u6570\u3092\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3069\u3061\u3089\u3082\u554f\u984c\u306a\u304f then\u30e1\u30bd\u30c3\u30c9\u3067\u51e6\u7406\u3092\u7e4b\u3050\u3053\u3068\u304c\u3067\u304d\u3066\u3044\u307e\u3059\u3002<br>\u3053\u306e\u3088\u3046\u306b\u3001\u540c\u671f\u30fb\u975e\u540c\u671f\u306b\u95a2\u308f\u3089\u305a Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d7\u3051\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u51e6\u7406\u5185\u5bb9\u3092\u7d71\u4e00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30b3\u30fc\u30c9\u3092\u7c21\u6f54\u306b\u898b\u3084\u3059\u304f\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u5148\u307b\u3069\u7d39\u4ecb\u3057\u305f\u3088\u3046\u306b\u3001try\u30e1\u30bd\u30c3\u30c9\u306f ES2025\u3067\u8ffd\u52a0\u3055\u308c\u305f\u65b0\u3057\u3044\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u74b0\u5883\u306b\u3088\u3063\u3066\u306f\u30e1\u30bd\u30c3\u30c9\u304c\u6d3b\u7528\u3067\u304d\u306a\u3044\u30b1\u30fc\u30b9\u3082\u3042\u308b\u305f\u3081\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001Promise\u3092\u4f7f\u3063\u305f\u975e\u540c\u671f\u51e6\u7406\u306e\u5b9f\u88c5\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<br>\u975e\u540c\u671f\u51e6\u7406\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u3068\u306e\u901a\u4fe1\u51e6\u7406\u306a\u3069\u3067\u3088\u304f\u6d3b\u7528\u3055\u308c\u308b\u6280\u8853\u3067\u3059\u306e\u3067\u3001\u4f7f\u3044\u65b9\u3092\u3057\u3063\u304b\u308a\u3068\u7406\u89e3\u3057\u3066\u304a\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__7\" 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\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u3068\u4fbf\u5229\u306a\u306e\u304c\u3001Promise\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002Promise\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u4f7f\u3063\u3066\u8a18\u8ff0\u3059\u308b\u3088\u308a\u3082\u7c21\u6f54\u306b\u30b3\u30fc\u30c9\u3092\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u4eca\u56de\u306f\u3001Promise\u3092\u4f7f\u7528\u3057\u3066\u975e\u540c\u671f\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002 Promise\u3068\u306f\uff1f Promise\u306f\u3001JavaScript\u3067\u751f\u6210\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e00\u7a2e [&hellip;]","protected":false},"author":11,"featured_media":10133,"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-promise.webp","fifu_image_alt":"\u3010JavaScript\u5165\u9580\u3011Promise\u3067\u975e\u540c\u671f\u51e6\u7406\u3092\u30b9\u30de\u30fc\u30c8\u306b\u5b9f\u88c5\u3059\u308b","footnotes":""},"categories":[15],"tags":[17],"class_list":["post-10128","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming","tag-javascript"],"_links":{"self":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/10128","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=10128"}],"version-history":[{"count":1,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/10128\/revisions"}],"predecessor-version":[{"id":10132,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/10128\/revisions\/10132"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media\/10133"}],"wp:attachment":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media?parent=10128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/categories?post=10128"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/tags?post=10128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}