{"id":10089,"date":"2025-11-28T16:36:33","date_gmt":"2025-11-28T07:36:33","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=10089"},"modified":"2025-12-04T19:24:04","modified_gmt":"2025-12-04T10:24:04","slug":"javascript-try-catch","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/javascript-try-catch\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011try-catch\u306b\u3088\u308b\u4f8b\u5916\u51e6\u7406\u3067\u30a8\u30e9\u30fc\u3092\u9632\u3050"},"content":{"rendered":"\n

\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u5b9f\u884c\u3059\u308b\u4e0a\u3067\u3001\u30a8\u30e9\u30fc\u306f\u5207\u3063\u3066\u3082\u5207\u308a\u96e2\u305b\u306a\u3044\u8981\u7d20\u306e\uff11\u3064\u3068\u306a\u308a\u307e\u3059\u3002
\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3068\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u5b9f\u884c\u304c\u505c\u6b62\u3055\u308c\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u672c\u6765\u3067\u3042\u308c\u3070\uff11\u3064\u3082\u30a8\u30e9\u30fc\u304c\u8d77\u304d\u306a\u3044\u3088\u3046\u306b\u4f5c\u6210\u3067\u304d\u308b\u306e\u304c\uff11\u756a\u306e\u7406\u60f3\u3068\u306a\u308a\u307e\u3059\u304c\u3001\u73fe\u5b9f\u306b\u306f\u4e88\u671f\u3057\u306a\u3044\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u306f\u307e\u307e\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u305d\u306e\u969b\u306b\u3001\u30a8\u30e9\u30fc\u3092\u5b89\u5168\u306b\u56de\u907f\u3057\u3066\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u6b62\u3081\u308b\u3053\u3068\u306a\u304f\u7d9a\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002
\u305d\u308c\u304c\u3001\u4f8b\u5916\u51e6\u7406\u3067\u3059\u3002<\/p>\n\n\n\n

\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306f\u3001JavaScript\u3067\u4f8b\u5916\u51e6\u7406\u3092\u6271\u3046\u65b9\u6cd5\u306e\uff11\u3064\u3067\u3042\u308b try\u2026catch\u6587\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002
\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u5fdc\u7528\u65b9\u6cd5\u3001\u4f7f\u7528\u3059\u308b\u4e0a\u3067\u306e\u6ce8\u610f\u70b9\u306a\u3069\u3092\u307e\u3068\u3081\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n

try-catch\u6587\u3068\u306f\uff1f<\/h2>\n\n\n\n

try\u2026catch\u6587\u306f\u3001\u4f8b\u5916\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u69cb\u6587\u3067\u3059\u3002<\/p>\n\n\n\n

\u901a\u5e38\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u4e2d\u306b\u4f55\u304b\u3057\u3089\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3068\u3001\u305d\u306e\u6bb5\u968e\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u306f\u505c\u6b62\u3055\u308c\u307e\u3059\u3002
\u3067\u3059\u304c\u3001\u5b9f\u969b\u306b\u958b\u767a\u3092\u3057\u3066\u3044\u308b\u3068\u3001\u30a8\u30e9\u30fc\u767a\u751f\u6642\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u505c\u6b62\u3055\u305b\u308b\u3053\u3068\u306a\u304f\u6b21\u306e\u51e6\u7406\u306b\u79fb\u884c\u3055\u305b\u305f\u3044\u30b1\u30fc\u30b9\u306f\u591a\u3005\u51fa\u3066\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

try\u2026catch\u6587\u3092\u4f7f\u7528\u3057\u3066\u4f8b\u5916\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u3068\u3001\u30a8\u30e9\u30fc\u767a\u751f\u6642\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u505c\u6b62\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001\u8a18\u8ff0\u3057\u305f\u51e6\u7406\u5185\u5bb9\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002
\u610f\u56f3\u3057\u306a\u3044\u52d5\u4f5c\u306b\u3088\u3063\u3066\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3082\u3001\u5b89\u5168\u306b\u51e6\u7406\u3092\u56de\u907f\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u6a5f\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

try-catch\u6587\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n

try\u2026catch\u6587\u306e\u8a73\u3057\u3044\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

\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n

\u307e\u305a\u306f\u3001\u57fa\u672c\u69cb\u6587\u304b\u3089\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

try\u2026catch\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u6587\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n

try {\n    \/\/\u30a8\u30e9\u30fc\u3092\u30ad\u30e3\u30c3\u30c1\u3057\u305f\u3044\u51e6\u7406\u5185\u5bb9\n} catch( error ) {\n    \/\/\u4e0a\u8a18\u306e\u51e6\u7406\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u5b9f\u884c\u3059\u308b\u51e6\u7406\n}<\/code><\/pre><\/div>\n\n\n\n
\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u969b\u306b\u56de\u907f\u3055\u305b\u305f\u3044\u51e6\u7406\u3092 try{} \u3067\u56f2\u307f\u3001\u5b9f\u969b\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u5b9f\u884c\u3059\u308b\u56de\u907f\u51e6\u7406\u3092 catch{} \u3067\u56f2\u3093\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u306e\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u3067\u3001\u30a8\u30e9\u30fc\u304c\u5b9f\u969b\u306b\u767a\u751f\u3057\u305f\u5834\u5408\u306e\u52d5\u304d\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {   \n    const result = num * 100;\n    \n    console.log(result);\n\n} catch(error) {\n\n    console.error(error.message);\n}\n\nconsole.log("\u5b9f\u884c\u5b8c\u4e86");<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
num is not defined\n\u5b9f\u884c\u5b8c\u4e86<\/code><\/pre><\/div>\n\n\n\n
\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001\u672a\u5ba3\u8a00\u306e\u5909\u6570\u3092\u4f7f\u7528\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002
\u4f8b\u5916\u51e6\u7406\u3092\u5b9f\u88c5\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u6bb5\u968e\u3067\u51e6\u7406\u304c\u6b62\u307e\u308b\u305f\u3081 \u300c\u5b9f\u884c\u5b8c\u4e86\u300d \u306e\u30ed\u30b0\u304c\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u304c\u3001try\u2026catch\u6587\u3092\u4f7f\u3046\u3053\u3068\u3067\u51e6\u7406\u304c\u7d99\u7d9a\u3055\u308c\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u307e\u305f\u3001catch\u30d6\u30ed\u30c3\u30af\u306e\u5f15\u6570\u306b\u306f Error\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6e21\u3055\u308c\u308b\u305f\u3081\u3001message\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002
\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u306e\u3088\u3046\u306b\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u969b\u306b\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u3067\u3001\u52d5\u4f5c\u306e\u78ba\u8a8d\u6642\u306b\u8a73\u7d30\u3092\u628a\u63e1\u3057\u3084\u3059\u304f\u306a\u308b\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
throw\u3067\u5f37\u5236\u7684\u306b\u4f8b\u5916\u3092\u6295\u3052\u308b<\/h3>\n\n\n\n
JavaScript\u3067\u306f\u3001throw\u6587\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u610f\u56f3\u7684\u306b\u4f8b\u5916\u3092\u767a\u751f\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u306b\u304a\u3044\u3066\u3001\u30d6\u30ed\u30c3\u30af\u5185\u306e\u51e6\u7406\u3092\u505c\u6b62\u3057\u6b21\u306e\u51e6\u7406\u306e\u79fb\u884c\u3055\u305b\u305f\u3044\u5834\u5408\u306a\u3069\u306b\u6d3b\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u5b9f\u969b\u306e\u52d5\u304d\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {\n\n    const sampleArray = [1, 5, 3, 12, 8];\n\n    sampleArray.forEach(num => {\n\n         if(num > 10){\n             throw new Error("10\u3088\u308a\u5927\u304d\u3044\u6570\u5024\u3067\u3059");\n         }else{\n             console.log(num);\n         }      \n    });\n\n} catch(error) {\n\n    console.error(error.message);\n}<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
1\n5\n3\n10\u3088\u308a\u5927\u304d\u3044\u6570\u5024\u3067\u3059<\/code><\/pre><\/div>\n\n\n\n
\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u914d\u5217\u5185\u306e\u8981\u7d20\u306e\u5024\u304c10\u3088\u308a\u5927\u304d\u3044\u5834\u5408\u306b\u4f8b\u5916\u3092\u6295\u3052\u308b\u3088\u3046\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002
\u5b9f\u884c\u7d50\u679c\u3092\u898b\u3066\u307f\u308b\u3068\u30014\u3064\u76ee\u306e\u8981\u7d20\u306e\u5024\u304c10\u3088\u308a\u3082\u5927\u304d\u3044\u305f\u3081\u3001\u305d\u306e\u6bb5\u968e\u3067\u30d6\u30ed\u30c3\u30af\u5185\u306e\u51e6\u7406\u304c\u4e2d\u65ad\u3055\u308c\u3001\u4f8b\u5916\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
throw\u6587\u3092\u4f7f\u7528\u3057\u3066\u4f8b\u5916\u3092\u767a\u751f\u3055\u305b\u308b\u5834\u5408\u306f\u3001catch\u30d6\u30ed\u30c3\u30af\u306e\u5f15\u6570\u306b\u6e21\u3059\u5024\u3092\u4efb\u610f\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\u6587\u5b57\u5217\u3084\u6570\u5024\u306a\u3069\u3082\u6307\u5b9a\u53ef\u80fd\u3067\u3059\u304c\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\uff08\u95a2\u6570\u306a\u3069\u306e\u547c\u3073\u51fa\u3057\u5c65\u6b74\uff09\u304c\u53d6\u5f97\u3067\u304d\u305a\u3001\u554f\u984c\u306e\u767a\u751f\u7b87\u6240\u306e\u7279\u5b9a\u304c\u56f0\u96e3\u3068\u306a\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u57fa\u672c\u7684\u306b\u306f Error\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3059\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n
\u30a8\u30e9\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7a2e\u985e\u306b\u3064\u3044\u3066<\/h3>\n\n\n\n
JavaScript\u306b\u306f\u3001Error\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u3067\u3042\u308b\u30a8\u30e9\u30fc\u578b\u304c\u4f55\u7a2e\u985e\u304b\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u4f8b\u3048\u3070\u3001\u5909\u6570\u3084\u5f15\u6570\u306a\u3069\u306e\u30c7\u30fc\u30bf\u578b\u306b\u95a2\u3059\u308b\u30a8\u30e9\u30fc\u3084\u3001\u6570\u5024\u306a\u3069\u3092\u6271\u3046\u969b\u306e\u6709\u52b9\u7bc4\u56f2\u306b\u95a2\u3059\u308b\u30a8\u30e9\u30fc\u306a\u3069\u3001\u305d\u308c\u305e\u308c\u306e\u30b1\u30fc\u30b9\u306b\u5bfe\u5fdc\u3059\u308b\u30a8\u30e9\u30fc\u578b\u304c\u65e2\u5b58\u3067\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002
try\u2026catch\u6587\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067\u610f\u56f3\u7684\u3067\u306a\u3044\u4f8b\u5916\u304c\u767a\u751f\u3057\u305f\u969b\u306b\u3001catch\u30d6\u30ed\u30c3\u30af\u306e\u5f15\u6570\u306b\u6e21\u3055\u308c\u308b Error\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u53b3\u5bc6\u306b\u306f\u3053\u306e\u30a8\u30e9\u30fc\u578b\u306e\u3044\u305a\u308c\u304b\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u306b\u3001\u4ee3\u8868\u7684\u306a\u30a8\u30e9\u30fc\u578b\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010RangeError\u3011<\/h4>\n\n\n\n
\u7279\u5b9a\u306e\u51e6\u7406\u306b\u5bfe\u3057\u3066\u3001\u6709\u52b9\u306a\u5024\u306e\u7bc4\u56f2\u5916\u306b\u3042\u308b\u6570\u5024\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002
\u4e3b\u306b\u3001\u95a2\u6570\u306a\u3069\u306e\u5f15\u6570\u306b\u5024\u3092\u6e21\u3059\u969b\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
 \/\/ Array\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u4e0d\u6b63\u306a\u9577\u3055\u306e\u914d\u5217\u3092\u4f5c\u6210\u3057\u3088\u3046\u3068\u3059\u308b\nconst sampleArray = new Array(-1);<\/code><\/pre><\/div>\n\n\n\n
\u3010ReferenceError\u3011<\/h4>\n\n\n\n
\u5b58\u5728\u3057\u306a\u3044\u3001\u307e\u305f\u306f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u5909\u6570\u3084\u95a2\u6570\u3092\u53c2\u7167\u3057\u3088\u3046\u3068\u3057\u305f\u5834\u5408\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002
\u30b9\u30da\u30eb\u30df\u30b9\u306a\u3069\u3067\u5b58\u5728\u3057\u306a\u3044\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u308a\u3001\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u306b\u30d6\u30ed\u30c3\u30af\u5916\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u969b\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
 \/\/ \u5ba3\u8a00\u3055\u308c\u3066\u3044\u306a\u3044\u5909\u6570 sample \u3092\u53c2\u7167\nconsole.log(sample);<\/code><\/pre><\/div>\n\n\n\n
\u3010SyntaxError\u3011<\/h4>\n\n\n\n
\u5b9f\u884c\u3059\u308b\u30b3\u30fc\u30c9\u306e\u69cb\u6587\u306b\u30df\u30b9\u304c\u3042\u308b\u5834\u5408\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002
\u30e1\u30bd\u30c3\u30c9\u3092\u8a18\u8ff0\u3059\u308b\u969b\u306b\u62ec\u5f27\u306e\u9589\u3058\u5fd8\u308c\u304c\u3042\u3063\u305f\u308a\u306a\u3069\u3001\u6c7a\u3081\u3089\u308c\u305f\u6587\u6cd5\u306b\u6cbf\u308f\u306a\u3044\u30b3\u30fc\u30c9\u304c\u3042\u308b\u3068\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
SyntaxError\u306b\u95a2\u3057\u3066\u306f\u3001\u30a8\u30e9\u30fc\u304c\u691c\u77e5\u3055\u308c\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u306e\u95a2\u4fc2\u4e0a\u3001\u57fa\u672c\u7684\u306b\u306f try\u2026catch\u6587\u3067\u30ad\u30e3\u30c3\u30c1\u3059\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002
\u305f\u3060\u3057\u3001throw\u6587\u3067 catch\u30d6\u30ed\u30c3\u30af\u306b\u6e21\u3059\u5024\u3092\u6307\u5b9a\u3059\u308b\u969b\u306b\u3001SyntaxError\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
 \/\/ ) \u304c\u4f59\u5206\u306b\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\nconsole.log("Hello"));<\/code><\/pre><\/div>\n\n\n\n
\u3010TypeError\u3011<\/h4>\n\n\n\n
\u7279\u5b9a\u306e\u51e6\u7406\u306b\u5bfe\u3057\u3066\u3001\u4f7f\u7528\u3059\u308b\u5024\u304c\u671f\u5f85\u3059\u308b\u30c7\u30fc\u30bf\u578b\u3067\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002
\u5bfe\u8c61\u306e\u30c7\u30fc\u30bf\u578b\u306b\u306a\u3044\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u304a\u3046\u3068\u3057\u305f\u308a\u3001\u95a2\u6570\u3067\u306a\u3044\u3082\u306e\u3092\u95a2\u6570\u3068\u3057\u3066\u547c\u3073\u51fa\u3057\u305f\u308a\u3057\u305f\u969b\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
const sampleNum = 10;\n\/\/ \u6570\u5024\u578b\u306bslice\u30e1\u30bd\u30c3\u30c9\u306f\u306a\u3044\u305f\u3081\u30a8\u30e9\u30fc\u3068\u306a\u308b\nconst result = sampleNum.slice(2);<\/code><\/pre><\/div>\n\n\n\n
\u3010URIError\u3011<\/h4>\n\n\n\n
encodeURI \u3084 decodeURI \u306a\u3069\u306e\u95a2\u6570\u3067\u3001\u4e0d\u6b63\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u4f7f\u7528\u3055\u308c\u305f\u5834\u5408\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u3067\u3059\u3002
\u30a8\u30f3\u30b3\u30fc\u30c9\u3001\u3082\u3057\u304f\u306f\u30c7\u30b3\u30fc\u30c9\u304c\u4e0d\u53ef\u80fd\u306a\u5024\u304c\u5f15\u6570\u306b\u5165\u529b\u3055\u308c\u305f\u969b\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
\/\/ \u4e0d\u5b8c\u5168\u306a\u30d1\u30fc\u30bb\u30f3\u30c8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\ndecodeURI('%');<\/code><\/pre><\/div>\n\n\n\n
try-catch\u6587\u306e\u6d3b\u7528\u6cd5<\/h2>\n\n\n\n
try\u2026catch\u6587\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u306f\u4e0a\u8ff0\u3057\u305f\u901a\u308a\u3067\u3059\u304c\u3001\u305d\u306e\u4ed6\u306b\u3082\u3044\u304f\u3064\u304b\u306e\u4fbf\u5229\u306a\u6a5f\u80fd\u304c\u5b58\u5728\u3057\u307e\u3059\u3002
\u9806\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u8907\u6570\u306e\u30a8\u30e9\u30fc\u3092\u30ad\u30e3\u30c3\u30c1\u3059\u308b<\/h3>\n\n\n\n
Promise.any\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306a\u3069\u3001\u51e6\u7406\u5185\u5bb9\u306b\u3088\u3063\u3066\u306f\u8907\u6570\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\u3082\u5b58\u5728\u3057\u307e\u3059\u3002
\u305d\u306e\u969b\u306b\u6d3b\u7528\u3055\u308c\u308b\u306e\u304c\u3001AggregateError \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n
AggregateError\u306f\u3001\u8907\u6570\u306e\u30a8\u30e9\u30fc\u3092\uff11\u3064\u306e\u5024\u3068\u3057\u3066\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {\n    const errors = [new Error("error1"), new Error("error2")];\n    throw new AggregateError(errors, "sampleError");\n    \n} catch(error) {\n    console.log(error.message); \/\/ sampleError\n    console.log(error.errors); \/\/ [Error: error1, Error: error2]\n}<\/code><\/pre><\/div>\n\n\n\n
\u307e\u305f\u3001\u51e6\u7406\u5185\u5bb9\u306b\u3088\u3063\u3066\u306f\u3001\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u306b\u3044\u304f\u3064\u304b\u306e\u5019\u88dc\u304c\u3042\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002
\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u306b\u3088\u3063\u3066\u3001\u5b9f\u884c\u3059\u308b\u4f8b\u5916\u51e6\u7406\u3092\u6761\u4ef6\u5206\u3051\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u3001instanceof\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066\u578b\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {\n    const sampleNum = 10;\n    \n    sampleNum();\n        \n} catch(e) {\n\n    if (e instanceof TypeError) {\n        \/\/ TypeError\u306e\u5834\u5408\u306e\u51e6\u7406\n        console.error("TypeError:", e.message);\n        \n    } else if (e instanceof ReferenceError) {\n        \/\/ ReferenceError\u306e\u5834\u5408\u306e\u51e6\u7406\n        console.error("ReferenceError:", e.message);\n        \n    } else {\n        \/\/ \u305d\u306e\u4ed6\u306e\u30a8\u30e9\u30fc\u306e\u5834\u5408\u306e\u51e6\u7406\n        console.error("\u4e88\u671f\u305b\u306c\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f:", e);\n    }\n}<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
TypeError: sampleNum is not a function<\/code><\/pre><\/div>\n\n\n\n
finally\u6587\u3067\u5fc5\u305a\u5b9f\u884c\u3059\u308b\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b<\/h3>\n\n\n\n
try\u2026catch\u6587\u306f\u3001\u4f8b\u5916\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306b\u306f try\u30d6\u30ed\u30c3\u30af\u306e\u51e6\u7406\u304c\u4e2d\u65ad\u3055\u308c\u3001\u767a\u751f\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u306f catch\u30d6\u30ed\u30c3\u30af\u306e\u51e6\u7406\u304c\u30b9\u30eb\u30fc\u3055\u308c\u307e\u3059\u3002
\u305d\u3046\u3057\u305f\u51e6\u7406\u7d50\u679c\u306b\u95a2\u308f\u3089\u305a\u3001\u5fc5\u305a\u5b9f\u884c\u3055\u305b\u305f\u3044\u51e6\u7406\u304c\u3042\u308b\u5834\u5408\u306b\u5f79\u7acb\u3064\u306e\u304c\u3001finally\u6587\u3067\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {\n    const sampleNum = 10;\n    sampleNum();\n\n    console.log("\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093");\n        \n} catch(e) {\n    console.error(e.message);\n\n} finally {\n    console.log("\u5fc5\u305a\u5b9f\u884c\u3055\u308c\u307e\u3059");\n}<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
sampleNum is not a function\n\u5fc5\u305a\u5b9f\u884c\u3055\u308c\u307e\u3059<\/code><\/pre><\/div>\n\n\n\n
\u5fc5\u8981\u3068\u306a\u308b\u30b1\u30fc\u30b9\u306f\u305d\u3053\u307e\u3067\u591a\u304f\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u899a\u3048\u3066\u304a\u304f\u3068\u4fbf\u5229\u306a\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n
try-catch\u306e\u30a8\u30e9\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/h2>\n\n\n\n
\u65e2\u306b\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001try\u2026catch\u6587\u3067\u306e\u4f8b\u5916\u51e6\u7406\u306b\u306f Error\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6b20\u304b\u305b\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
Error\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3001\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u4f7f\u7528\u3057\u305f message\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u4ed6\u306b\u3001\u30a8\u30e9\u30fc\u5185\u5bb9\u306e\u8a73\u7d30\u78ba\u8a8d\u306b\u6d3b\u7528\u3067\u304d\u308b\u3044\u304f\u3064\u304b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u5b58\u5728\u3057\u307e\u3059\u3002
\u305d\u308c\u3089\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3082\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
stack\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u884c\u3046<\/h3>\n\n\n\n
Error\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u7b87\u6240\u3084\u539f\u56e0\u3092\u8a73\u3057\u304f\u77e5\u308b\u306e\u306b\u5f79\u7acb\u3064\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002
\u305d\u306e\u4e2d\u306e1\u3064\u304c\u3001stack\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002<\/p>\n\n\n\n
stack\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001\u30a8\u30e9\u30fc\u306e\u767a\u751f\u7b87\u6240\u3092\u542b\u3080\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002
\u3053\u308c\u306b\u3088\u308a\u3001\u3069\u306e\u51e6\u7406\u304c\u539f\u56e0\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u306e\u304b\u3092\u8aad\u307f\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {\n    const sampleNum = 10;  \n    sampleNum();\n        \n} catch(e) {   \n    console.error(e.stack);\n}<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
TypeError: sampleNum is not a function\n    at Object.<anonymous> (\/tmp\/main.js:4:5)\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
stack\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u306f\u3001\u30a8\u30e9\u30fc\u30bf\u30a4\u30d7\u306a\u3069\u3092\u793a\u3059\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u52a0\u3048\u3066\u3001\u30a8\u30e9\u30fc\u767a\u751f\u304b\u3089\u76f4\u8fd1\u307e\u3067\u306e\u5b9f\u884c\u5185\u5bb9\u306e\u5c65\u6b74\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\u5c65\u6b74\u306b\u306f\u3001\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084\u95a2\u6570\u3068\u3001\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\u30d5\u30a1\u30a4\u30eb\u3084\u884c\u306a\u3069\u306e\u60c5\u5831\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002
\u3053\u308c\u3089\u306e\u5185\u5bb9\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5177\u4f53\u7684\u306a\u51e6\u7406\u5185\u5bb9\u3084\u5834\u6240\u3092\u7279\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u307e\u305f\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u7b87\u6240\u306e\u30d5\u30a1\u30a4\u30eb\u540d\u3084\u884c\u756a\u53f7\u306a\u3069\u3092\u500b\u5225\u306b\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306f\u3001fileName\u30d7\u30ed\u30d1\u30c6\u30a3\u3068lineNumber\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u53d6\u5f97\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {\n    const sampleNum = 10;  \n    sampleNum();\n        \n} catch(e) {   \n    console.error(e.message);\n    console.error(e.fileName);\n    console.error(e.lineNumber);\n}<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
sampleNum is not a function\n\/tmp\/main.js\n4<\/code><\/pre><\/div>\n\n\n\n
\u305f\u3060\u3057\u3001\u3053\u308c\u3089\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3044\u305a\u308c\u3082\u975e\u6a19\u6e96\u3067\u3042\u308b\u305f\u3081\u3001\u30d6\u30e9\u30a6\u30b6\u30fc\u306e\u5bfe\u5fdc\u304c\u9650\u3089\u308c\u3066\u3044\u307e\u3059\u3002
\u307e\u305f\u3001\u6a19\u6e96\u5316\u3055\u308c\u308b\u4e88\u5b9a\u3082\u4eca\u306e\u3068\u3053\u308d\u306a\u304f\u3001\u4f7f\u7528\u3067\u304d\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u3082\u5c11\u306a\u304b\u3089\u305a\u6b8b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u4f7f\u7528\u6642\u306e\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001\u672c\u756a\u74b0\u5883\u3067\u306e\u4f7f\u7528\u306f\u63a8\u5968\u3055\u308c\u3066\u3044\u306a\u3044\u306e\u3067\u3001\u3042\u304f\u307e\u3067\u30c7\u30d0\u30c3\u30b0\u6642\u306e\u6a5f\u80fd\u3068\u3057\u3066\u7559\u3081\u3066\u304a\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u95a2\u6570\u5316\u3059\u308b<\/h3>\n\n\n\n
\u30a8\u30e9\u30fc\u767a\u751f\u306b\u3088\u308b\u4f8b\u5916\u51e6\u7406\u3092\u884c\u3046\u969b\u306f\u3001\u307b\u307c\u5fc5\u305a\u3068\u3044\u3063\u305f\u983b\u5ea6\u3067\u30a8\u30e9\u30fc\u5185\u5bb9\u306e\u8868\u793a\u3092\u884c\u3046\u304b\u3068\u601d\u3044\u307e\u3059\u3002
\u305d\u306e\u305f\u3081\u3001\u305d\u308c\u305e\u308c\u306e\u51e6\u7406\u3067\u72ec\u7acb\u3059\u308b\u5185\u5bb9\u3092\u9664\u3044\u3066\u3001\u30a8\u30e9\u30fc\u8868\u793a\u306a\u3069\u306e\u5171\u901a\u51e6\u7406\u306f\u95a2\u6570\u5316\u3057\u3066\u304a\u304f\u3068\u52b9\u7387\u3088\u304f\u904b\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u4f8b\u3048\u3070\u3001\u5148\u307b\u3069\u7d39\u4ecb\u3057\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u306a\u3069\u3092\u6d3b\u7528\u3057\u3066\u3001\u72ec\u81ea\u306b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
function showError(e) {\n\n    let errMsg = `\u3010 \u30a8\u30e9\u30fc\uff1a${e.message} \u3011\\n`;\n    \n    if (e.fileName && e.lineNumber) {\n        errMsg += "\u30d5\u30a1\u30a4\u30eb\u540d\uff1a" + e.fileName + "\u3001 \u884c\u756a\u53f7\uff1a" + e.lineNumber + "\\n";\n    }\n \n    if (e.stack) {\n        errMsg += "---- \u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\uff1a ----\\n";\n        errMsg += e.stack + "\\n";\n        errMsg += "--------------------------\\n";\n    }\n \n    console.error(errMsg);\n}\n\ntry {\n    const sampleNum = 10;  \n    sampleNum();\n        \n} catch(e) {   \n    showError(e);\n}<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
\u3010 \u30a8\u30e9\u30fc\uff1asampleNum is not a function \u3011\n\u30d5\u30a1\u30a4\u30eb\u540d\uff1a\/tmp\/main.js\u3001 \u884c\u756a\u53f7\uff1a21\n---- \u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\uff1a ----\nTypeError: sampleNum is not a function\n    at Object.<anonymous> (\/tmp\/main.js:21:5)\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\n--------------------------<\/code><\/pre><\/div>\n\n\n\n
\u3053\u308c\u3089\u306e\u51e6\u7406\u3092\u95a2\u6570\u5316\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u7c21\u5358\u306b\u72ec\u81ea\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\u591a\u304f\u306e\u30ed\u30b0\u306e\u4e2d\u306b\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u7d1b\u308c\u3066\u3044\u308b\u3068\u898b\u3065\u3089\u3044\u5834\u5408\u3082\u591a\u304f\u3001\u78ba\u8a8d\u3059\u308b\u306e\u306b\u624b\u9593\u304c\u751f\u3058\u3066\u3057\u307e\u3046\u3053\u3068\u3082\u3042\u308b\u305f\u3081\u3001\u898b\u3084\u3059\u3044\u3088\u3046\u306b\u30ab\u30b9\u30bf\u30e0\u3059\u308b\u306e\u306f1\u3064\u306e\u624b\u3067\u3059\u3002<\/p>\n\n\n\n
try-catch\u6587\u306e\u6ce8\u610f\u70b9<\/h2>\n\n\n\n
try\u2026catch\u6587\u306f\u3001\u5148\u307b\u3069\u89e3\u8aac\u3057\u305f\u4e00\u90e8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u4ed6\u306b\u3082\u3001\u4f7f\u7528\u3059\u308b\u4e0a\u3067\u6ce8\u610f\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u91cd\u8981\u306a\u70b9\u304c\u3044\u304f\u3064\u304b\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u305d\u308c\u305e\u308c\u306e\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u3001\u4e00\u7dd2\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u975e\u540c\u671f\u51e6\u7406\u3067\u306f try-catch\u6587\u304c\u52b9\u304b\u306a\u3044<\/h3>\n\n\n\n
\u4f8b\u5916\u51e6\u7406\u306b\u6d3b\u7528\u3055\u308c\u3066\u3044\u308b try\u2026catch\u6587\u3067\u3059\u304c\u3001\u975e\u540c\u671f\u51e6\u7406\u3067\u767a\u751f\u3057\u305f\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066\u306f\u30ad\u30e3\u30c3\u30c1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002
\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
try {\n  setTimeout(() => {\n    throw new Error('\u975e\u540c\u671f\u30a8\u30e9\u30fc');\n  }, 3000);\n} catch (e) {\n  console.error(e.message); \/\/ \u3053\u306e\u51e6\u7406\u306f\u547c\u3070\u308c\u306a\u3044\n}<\/code><\/pre><\/div>\n\n\n\n
\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u306e\u5834\u5408\u3001throw\u6587\u3067\u4f8b\u5916\u3092\u6295\u3052\u308b\u51e6\u7406\u306e\u5b9f\u884c\u30bf\u30a4\u30df\u30f3\u30b0\u304c setTimeout \u306b\u3088\u3063\u3066\u5f8c\u308d\u306b\u305a\u3089\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30b3\u30fc\u30c9\u304c\u5b9f\u884c\u3055\u308c\u308b\u6bb5\u968e\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u5168\u4f53\u306e\u51e6\u7406\u306f\u65e2\u306b try\u30d6\u30ed\u30c3\u30af\u3092\u629c\u3051\u305f\u5f8c\u306e\u72b6\u614b\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002
try\u2026catch\u6587\u3067\u306f\u3001\u30b9\u30b3\u30fc\u30d7\u304c try\u30d6\u30ed\u30c3\u30af\u5185\u306b\u3042\u308b\u9593\u306e\u30a8\u30e9\u30fc\u3057\u304b\u30ad\u30e3\u30c3\u30c1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u975e\u540c\u671f\u51e6\u7406\u306b\u3088\u3063\u3066\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3082 catch\u30d6\u30ed\u30c3\u30af\u306e\u51e6\u7406\u306f\u5b9f\u884c\u3055\u308c\u305a\u306b\u7d42\u308f\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\u975e\u540c\u671f\u51e6\u7406\u306e\u5834\u5408\u306f\u3001try\u2026catch\u6587\u306e\u4ee3\u308f\u308a\u306b Promise\u306e catch\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30e9\u30fc\u3092\u30ad\u30e3\u30c3\u30c1\u3059\u308b\u304b\u3001\u3082\u3057\u304f\u306f async\/await \u3068\u7d44\u307f\u5408\u308f\u305b\u3066 try\u2026catch\u6587\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
\/\/ Promise.catch \u306e\u5834\u5408\nnew Promise((_, reject) => {\n  setTimeout(() => {\n    reject(new Error('\u975e\u540c\u671f\u30a8\u30e9\u30fc'));\n  }, 3000);\n\n}).catch((e) => {\n    console.error(e.message);\n});\n\n\/\/ async\/await \u306e\u5834\u5408\nasync function sample() {\n  try {\n    const res = await fetch('\/sample\/data');\n    const data = await res.json();\n    console.log('\u53d6\u5f97\u6210\u529f:', data);\n  } catch (e) {\n    console.error('\u30c7\u30fc\u30bf\u53d6\u5f97\u306b\u5931\u6557:', e.message);\n  }\n}<\/code><\/pre><\/div>\n\n\n\n
\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u4e0b\u3052\u305a\u306btry-catch\u6587\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n\n\n\n
try\u2026catch\u6587\u306f\u3001\u3044\u3056\u3068\u3044\u3046\u6642\u306e\u30a8\u30e9\u30fc\u56de\u907f\u306b\u5f79\u7acb\u3064\u4fbf\u5229\u306a\u69cb\u6587\u3067\u3059\u304c\u3001\u51e6\u7406\u6642\u9593\u304c\u9045\u3044\u3068\u3044\u3046\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002
\u57fa\u672c\u7684\u306b\u306f\u3001try\u2026catch\u6587\u3092\u4f7f\u7528\u3057\u3066\u3044\u305f\u3068\u3044\u3046\u3060\u3051\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u306b\u5927\u304d\u304f\u5f71\u97ff\u304c\u51fa\u308b\u307b\u3069\u30a8\u30e9\u30fc\u304c\u983b\u7e41\u306b\u767a\u751f\u3059\u308b\u3053\u3068\u306f\u3042\u307e\u308a\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u5fc5\u8981\u4ee5\u4e0a\u306b\u4f7f\u7528\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b\u306b\u7e4b\u304c\u3063\u3066\u3057\u307e\u3046\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u8a66\u3057\u306b\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u3001\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306b\u304b\u304b\u308b\u6642\u9593\u3092\u8a08\u6e2c\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
function funcTryCatch() {\n    try {\n        throw new Error("message");\n    } catch(err) {\n        return err.message;\n    }\n    return true;\n}\n\nfunction measure1() {\n    console.time(1);\n    for (let i=0;i<100000;i++) funcTryCatch();\n    console.timeEnd(1);\n}\n\nmeasure1();<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
1: 3.264s<\/code><\/pre><\/div>\n\n\n\n
\u3053\u306e\u7d50\u679c\u3092\u898b\u308b\u3060\u3051\u3067\u3082\u3001\u5168\u3066\u306e\u51e6\u7406\u3092\u7d42\u3048\u308b\u306e\u306b\u304b\u306a\u308a\u306e\u6642\u9593\u304c\u304b\u304b\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u3053\u3046\u3057\u305f\u30b3\u30fc\u30c9\u306e\u6539\u5584\u7b56\u3068\u3057\u3066\u3001if \u6587\u3092\u4f7f\u7528\u3057\u305f\u6761\u4ef6\u5206\u3051\u306a\u3069\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002
\u305d\u3053\u3067\u3001\u5b9f\u969b\u306b\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u3092 if \u6587\u3067\u4ee3\u66ff\u3057\u305f\u5834\u5408\u306e\u7d50\u679c\u3068\u898b\u6bd4\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n
function funcIf() {\n    let message;\n\n    if (message) {\n        return message;\n    }\n    return true;\n}\n\nfunction measure2() {\n    console.time(2);\n    for (let i=0;i<100000;i++) funcIf();\n    console.timeEnd(2);\n}\n\nmeasure2();<\/code><\/pre><\/div>\n\n\n\n
\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n
2: 17.338ms<\/code><\/pre><\/div>\n\n\n\n
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\u3053\u306e\u3088\u3046\u306b\u3001try\u2026catch\u6587\u306e\u4f7f\u7528\u983b\u5ea6\u306a\u3069\u306b\u3088\u3063\u3066\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u5168\u4f53\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u304f\u5dee\u304c\u51fa\u3066\u3057\u307e\u3046\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
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\u307e\u3068\u3081<\/h2>\n\n\n\n
\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001JavaScript\u3067 try\u2026catch\u6587\u3092\u4f7f\u7528\u3057\u3066\u4f8b\u5916\u51e6\u7406\u3092\u884c\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
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\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u304c\u51fa\u3084\u3059\u3044\u6a5f\u80fd\u3067\u3082\u3042\u308b\u305f\u3081\u3001\u4f7f\u3044\u6240\u306e\u898b\u6975\u3081\u304c\u5fc5\u8981\u3068\u306a\u308b\u69cb\u6587\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u5f97\u3089\u308c\u308b\u6069\u6075\u306f\u304b\u306a\u308a\u5927\u304d\u3044\u3068\u8a00\u3048\u307e\u3059\u3002<\/p>\n\n\n\n
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JavaScript\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n
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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
\n
\uff1c\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306e\u7279\u5fb4\uff1e<\/strong>
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