{"id":58868,"date":"2018-06-16T13:00:51","date_gmt":"2018-06-16T04:00:51","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=58868"},"modified":"2025-04-23T10:24:09","modified_gmt":"2025-04-23T01:24:09","slug":"%e3%80%90javascript%e5%85%a5%e9%96%80%e3%80%91const%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e5%be%b9%e5%ba%95%e8%a7%a3%e8%aa%ac%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/58868","title":{"rendered":"JavaScript\u521d\u5fc3\u8005\u5fc5\u898b\uff01const\u3068\u306f\uff1f\u57fa\u790e\u306e\u57fa\u790e\u3092\u89e3\u8aac\uff01"},"content":{"rendered":"

\u5909\u6570\u306e\u5ba3\u8a00\u306f\u8272\u3005\u306a\u66f8\u304d\u65b9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u4e2d\u3067\u3082\u3061\u3087\u3063\u3068\u7279\u6b8a\u306a\u306e\u304c\u3001\u3042\u3068\u304b\u3089\u5024\u3092\u66f8\u304d\u63db\u3048\u305f\u304f\u306a\u3044\u5909\u6570\u3092\u4f5c\u308bconst\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n

const\u306a\u3093\u3066\u521d\u3081\u3066\u805e\u3044\u305f\u2026
\n\u3069\u3046\u3084\u3063\u3066\u4f7f\u3046\u3093\u3060\u308d\u3046\u2026\u3000<\/p>\n

\u3068\u3044\u3046\u7591\u554f\u3092\u304a\u6301\u3061\u306e\u65b9\u3001\u4eca\u56de\u306e\u8a18\u4e8b\u306f\u5fc5\u898b\u3067\u3059\u3002
\n\u5909\u6570\u306e\u5ba3\u8a00\u65b9\u6cd5\u306e\u3072\u3068\u3064\u3001const\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u4e0b\u8a18\u306e\u6d41\u308c\u3067\u3001const\u306b\u3064\u3044\u3066\u7406\u89e3\u3092\u6df1\u3081\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u3010\u57fa\u790e\u3011\u5909\u6570\u3068\u306f
\n\u3010\u57fa\u790e\u3011const\u3068\u306f
\n\u3010\u57fa\u790e\u3011const\u306e\u4f7f\u3044\u65b9
\n\u3010\u767a\u5c55\u3011\u4ed6\u306e\u5ba3\u8a00\u65b9\u6cd5\u3068\u306e\u9055\u3044<\/p>\n

\u5909\u6570\u3092\u4f7f\u3044\u3053\u306a\u3059\u306b\u306f\u3001const\u3092\u3057\u3063\u304b\u308a\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002
\n\u3053\u306e\u8a18\u4e8b\u3067\u30d0\u30c3\u30c1\u30ea\u5b66\u3093\u3067\u3044\u3063\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n

\u5909\u6570\u3068\u306f\uff1f<\/h2>\n

\u5909\u6570\u3068\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u4f7f\u308f\u308c\u308b\u3001\u5024\u3092\u5165\u308c\u3066\u304a\u304f\u305f\u3081\u306e\u7bb1\u3067\u3059\u3002<\/p>\n

\u540c\u3058\u5024\u3092\u4f7f\u3044\u307e\u308f\u3057\u305f\u3044\u3068\u304d\u3001\u3044\u3061\u3044\u3061\u66f8\u3044\u305f\u308a\u3059\u308b\u306e\u306f\u9762\u5012\u3067\u3059\u3088\u306d\u3002
\n\u307e\u305f\u306f\u3001\u9014\u4e2d\u3067\u5024\u304c\u5909\u308f\u3063\u3066\u3082\u3061\u3083\u3093\u3068\u5f15\u304d\u7d99\u3044\u3060\u72b6\u614b\u3067\u4f7f\u3044\u307e\u308f\u3057\u305f\u3044\u6642\u306a\u3093\u304b\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n

\u5909\u6570\u306e\u5ba3\u8a00\u65b9\u6cd5\u306f\u3044\u308d\u3044\u308d\u3042\u308a\u307e\u3059\u304c\u3001\u4eca\u56de\u89e3\u8aac\u3057\u3066\u3044\u304f\u306e\u306f\u3001\u305d\u306e\u4e2d\u3067\u3082\u5024\u306e\u66f8\u304d\u63db\u3048\u3092\u7981\u6b62\u3057\u305f\u72b6\u614b\u306e\u5909\u6570\u3092\u5ba3\u8a00\u3067\u304d\u308bconst\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n

\u5b9a\u6570\u3092\u5ba3\u8a00\u3059\u308bconst\u3068\u306f\uff1f<\/h2>\n

const\u3068\u306f\u5024\u66f8\u304d\u63db\u3048\u3092\u7981\u6b62\u3057\u305f\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n

\u4f8b\u3048\u3070\u540c\u3058\u5024\u3092\u4f7f\u3044\u307e\u308f\u3059\u5834\u5408\u3001\u3046\u3063\u304b\u308a\u9014\u4e2d\u3067\u5024\u304c\u66f8\u304d\u63db\u308f\u3063\u3066\u3057\u307e\u3063\u305f\u306a\u3093\u3066\u7d4c\u9a13\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f
\n\u305d\u308c\u306b\u6c17\u3065\u304b\u305a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u9032\u3081\u3066\u3044\u304f\u3068\u3001\u601d\u308f\u306c\u30d0\u30b0\u306e\u539f\u56e0\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n

\u305d\u3093\u306a\u6642\u306b\u4fbf\u5229\u306a\u306e\u304c\u3001const\u3067\u3059\u3002
\n\u4e8b\u524d\u306b\u5024\u3092\u5909\u3048\u306a\u3044\u3053\u3068\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u3001const\u3092\u4f7f\u3046\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\uff01\u3000<\/p>\n

const\u3067\u5ba3\u8a00\u3059\u308b\u65b9\u6cd5<\/h2>\n

\u6b21\u306b\u3001\u5177\u4f53\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

const\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001const\u3092\u5148\u982d\u306b\u3064\u3051\u3066\u5909\u6570\u3092\u5ba3\u8a00\u3057\u307e\u3059\u3002<\/p>\n

const \u5909\u6570\u540d = \u5909\u6570\u306b\u5165\u308c\u308b\u5024;<\/pre>\n
\u5909\u6570\u540d\u306f\u66f8\u304d\u63db\u3048\u4e0d\u53ef\u306e\u5909\u6570\u3067\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308b\u3088\u3046\u306b\u3001\u5927\u6587\u5b57 + \u300c_\u300d(\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc)\u3067\u8a2d\u5b9a\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n
\u5909\u6570\u5ba3\u8a00\u3068\u540c\u6642\u306b\u5024\u3092\u5165\u308c\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u4e0b\u3055\u3044\u3002<\/p>\n
const\u306e\u4f7f\u3044\u65b9<\/h2>\n
\u6b21\u306b\u3001const\u306e\u5177\u4f53\u7684\u306a\u4f7f\u3044\u65b9\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n
\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff1a<\/p>\n
const TAX_RATE = 0.08;\/\/\u6d88\u8cbb\u7a0e\u7387\r\n\r\nfunction test(){\r\n    var cost = 1000; \/\/\u5358\u4fa1\r\n    var num = 2;     \/\/\u6570\r\n    var taxCost;     \/\/\u6d88\u8cbb\u7a0e\u984d\r\n    var totalCost;   \/\/\u5408\u8a08\u91d1\u984d\r\n    \r\n    \/\/\u6d88\u8cbb\u7a0e\u91d1\u984d\u8a08\u7b97\r\n    taxCost = cost * TAX_RATE\r\n    \r\n    \/\/\u5408\u8a08\u91d1\u984d\u3092\u8a08\u7b97\r\n    totalCost = (cost + taxCost) * num;\r\n    console.log(totalCost);\r\n}\r\n\r\ntest();<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
2160<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001TAX_RATE\u306b\u6d88\u8cbb\u7a0e\u7387\u3092\u5165\u308c\u3001\u5408\u8a08\u91d1\u984d\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u8a66\u3057\u306b\u3001\u9014\u4e2d\u3067TAX_RATE\u306e\u5024\u3092\u518d\u4ee3\u5165\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff1a<\/p>\n
const TAX_RATE = 0.08;\/\/\u6d88\u8cbb\u7a0e\u7387\r\nconst TAX_RATE = 0.05;\/\/\u518d\u4ee3\u5165\r\n\r\nfunction test(){\r\n    var cost = 1000; \/\/\u5358\u4fa1\r\n    var num = 2;     \/\/\u6570\r\n    var taxCost;     \/\/\u6d88\u8cbb\u7a0e\u984d\r\n    var totalCost;   \/\/\u5408\u8a08\u91d1\u984d\r\n    \r\n    \/\/\u6d88\u8cbb\u7a0e\u91d1\u984d\u8a08\u7b97\r\n    taxCost = cost * TAX_RATE\r\n    \r\n    \/\/\u5408\u8a08\u91d1\u984d\u3092\u8a08\u7b97\r\n    totalCost = (cost + taxCost) * num;\r\n    console.log(totalCost);\r\n}\r\n\r\ntest();<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
SyntaxError: Identifier 'TAX_RATE' has already been declared\u301c<\/pre>\n
\u30a8\u30e9\u30fc\u304c\u8868\u793a\u3055\u308c\u3061\u3083\u3044\u307e\u3057\u305f\u306d\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u3001const\u304c\u9014\u4e2d\u3067\u4e0a\u66f8\u304d\u3055\u308c\u308b\u3068\u3001\u30a8\u30e9\u30fc\u3092\u5410\u3044\u3066\u6559\u3048\u3066\u304f\u308c\u308b\u306e\u3067\u3059\u3002<\/p>\n
\u3064\u307e\u308a\u6d88\u8cbb\u7a0e\u7387\u306e\u3088\u3046\u306b\u3001\u51e6\u7406\u306e\u9014\u4e2d\u3067\u5024\u3092\u5909\u3048\u305f\u304f\u306a\u3044\u5834\u5408\u306f\u3001const\u3092\u4f7f\u3046\u3068\u30df\u30b9\u304c\u6e1b\u308a\u307e\u3059\u3002
\n\u3053\u308c\u306f\u6d3b\u7528\u3057\u3066\u3044\u304d\u305f\u3044\u3067\u3059\u306d\u3002<\/p>\n
\u5909\u6570\u5ba3\u8a00\u306e\u7a2e\u985e<\/h2>\n
\u5909\u6570\u306e\u5b9a\u7fa9\u65b9\u6cd5\u306f\u3001const\u4ee5\u5916\u306b\u3082var\u3001let\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u3069\u3093\u306a\u9055\u3044\u304c\u3042\u308b\u306e\u304b\u3001\u78ba\u8a8d\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n
var<\/h3>\n
\u4e00\u756a\u57fa\u672c\u7684\u306a\u5909\u6570\u306e\u5ba3\u8a00\u65b9\u6cd5\u3067\u3059\u3002
\n\u95a2\u6570\u306e\u4e2d\u3067\u5ba3\u8a00\u3059\u308b\u3068\u3001\u305d\u306e\u95a2\u6570\u306e\u4e2d\u3067\u3057\u304b\u4f7f\u3048\u306a\u3044\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3068\u3057\u3066\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
var item = 0; \/\/\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\r\n \r\nfunction test() {\r\n    var item = 10; \/\/\u30ed\u30fc\u30ab\u30eb\u5909\u6570\r\n    console.log(item);\r\n}\r\n \r\ntest();\r\nconsole.log(item);<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
10\r\n0<\/pre>\n
\u4e0a\u8a18\u306e\u4f8b\u3092\u898b\u308b\u3068\u30011\u56de\u76ee\u306econsole.log\u3067\u306f10\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u304c\u30012\u56de\u76ee\u306econsole.log\u3067\u306f0\u306e\u307e\u307e\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002
\n\u3053\u306e\u3088\u3046\u306b\u3001\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u4f4d\u7f6e\u306b\u3088\u3063\u3066\u3001\u305d\u306e\u5909\u6570\u306e\u9069\u7528\u7bc4\u56f2\u304c\u5909\u308f\u3063\u3066\u304f\u308b\u306e\u3067\u3059\u3002<\/p>\n
var\u306b\u3064\u3044\u3066\u306f\u3001\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u3082\u3063\u3068\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002
\n\u3053\u3061\u3089\u3082\u4f75\u305b\u3066\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
>>\u5909\u6570\u5b9a\u7fa9\u306e\u57fa\u790e\uff01var\u3068\u306f\uff1f<\/a><\/p>\n
let<\/h3>\n
let\u306fvar\u3068\u540c\u3058\u3088\u3046\u306b\u5909\u6570\u3092\u5ba3\u8a00\u3059\u308b\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057var\u3068\u306f\u3061\u3087\u3063\u3068\u9055\u3044\u3001let\u3092\u4f7f\u3046\u3068\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c\u30d6\u30ed\u30c3\u30af\u306b\u9650\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u6b21\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
let num = 123;\r\nconsole.log(num);\r\n{\r\n    let num = 456;\r\n    console.log(num);\r\n}\r\nconsole.log(num);<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
123\r\n456\r\n123<\/pre>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u7d50\u679c\u304b\u3089\u3001\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c\u30d6\u30ed\u30c3\u30af\u5185\u306b\u9650\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n
let\u306e\u8a73\u3057\u3044\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u4e0b\u8a18\u306e\u8a18\u4e8b\u3067\u3082\u3063\u3068\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002
\n\u3053\u3061\u3089\u3082\u4f75\u305b\u3066\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
>>\u5909\u6570\u5b9a\u7fa9\u306e\u57fa\u790e\uff01var\u3068\u306f\uff1f<\/a><\/p>\n
3\u3064\u306e\u9055\u3044\u306f\uff1f<\/h3>\n
var\u3001let\u3001const\u306e\u9055\u3044\u3092\u307e\u3068\u3081\u308b\u3068\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n
var:\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c\u95a2\u6570\u5185
\nlet:\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c\u30d6\u30ed\u30c3\u30af\u5185
\nconst:\u6700\u521d\u306e\u5ba3\u8a00\u304b\u3089\u5024\u3092\u5909\u66f4\u3055\u305b\u306a\u3044<\/p>\n
\u3069\u308c\u3082\u540c\u3058\u5909\u6570\u306e\u5ba3\u8a00\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u304c\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n
\u3046\u307e\u304f\u4f7f\u3044\u5206\u3051\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n
\u3053\u3093\u306a\u6642\u306fconst\u3092\u4f7f\u304a\u3046!<\/h2>\n
\u5148\u307b\u3069\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001\u6d88\u8cbb\u7a0e\u7387\u306a\u3069\u5024\u3092\u5909\u66f4\u3057\u305f\u304f\u306a\u3044\u5834\u5408\u306e\u307fconst\u3092\u4f7f\u3046\u306e\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u305a\u3063\u3068\u540c\u3058\u5024\u3092\u4f7f\u3044\u7d9a\u3051\u308b\u306a\u3089\u3070\u3001const\u4e00\u629e\u306a\u8a33\u3067\u3059\u3002<\/p>\n
\u9014\u4e2d\u3067\u5024\u304c\u5909\u308f\u308b\u3053\u3068\u3092\u60f3\u5b9a\u3057\u3066\u3044\u308b\u306a\u3089\u3070\u3001var\u3084let\u3092\u3046\u307e\u304f\u4f7f\u3044\u5206\u3051\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u4eca\u56de\u306f\u3001const\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n
const\u3092\u4f7f\u3046\u3053\u3068\u3067\u5024\u3092\u5909\u66f4\u3057\u305f\u304f\u306a\u3044\u5909\u6570\u3092\u3001\u8aa4\u3063\u3066\u66f8\u304d\u63db\u3048\u308b\u30df\u30b9\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
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