{"id":4571,"date":"2023-04-02T03:01:11","date_gmt":"2023-04-01T18:01:11","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=4571"},"modified":"2023-04-03T19:49:06","modified_gmt":"2023-04-03T10:49:06","slug":"javascript-obj-key-variables","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/javascript-obj-key-variables\/","title":{"rendered":"JavaScript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5909\u6570\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u3068\u53d6\u5f97\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-obj-key-variables\/#%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%AE%E3%82%AD%E3%83%BC%E3%81%AB%E5%A4%89%E6%95%B0%E3%82%92%E6%8C%87%E5%AE%9A%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95\" >\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u306b\u5909\u6570\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-obj-key-variables\/#%E5%A4%89%E6%95%B0%E3%81%A7%E6%8C%87%E5%AE%9A%E3%81%97%E3%81%9F%E3%82%AD%E3%83%BC%E3%81%AB%E3%82%A2%E3%82%AF%E3%82%BB%E3%82%B9%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95\" >\u5909\u6570\u3067\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u65b9\u6cd5<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">Javasciript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u5024\u306b\u5909\u6570\u3092\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u304c\u591a\u3005\u3042\u308a\u307e\u3059\u3002\u30ad\u30fc\u5024\u306b\u540c\u3058\u6587\u5b57\u5217\u3092\u6bce\u56de\u6307\u5b9a\u3059\u308b\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u7169\u96d1\u306b\u306a\u3063\u305f\u308a\u3001\u624b\u9593\u304c\u5897\u3048\u975e\u52b9\u7387\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u3053\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<strong>\u306e\u30ad\u30fc\u5024\u3092\u4e00\u62ec\u3067\u5909\u6570\u306b\u307e\u3068\u3081\u3066\u3057\u307e\u3046<\/strong>\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<br>Javasciript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-what-is-object\/\">JavaScript \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u4f55\u304b\uff1f\u6982\u8981\u3068\u8a18\u8ff0\u65b9\u6cd5\u3092\u57fa\u790e\u304b\u3089\u89e3\u8aac<\/a>\u300f\u3092\u3001Object\u578b\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-object\/\">JavaScript\u306b\u304a\u3051\u308bObject\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u578b<\/a>\u300f\u306b\u8a73\u3057\u304f\u307e\u3068\u3081\u3066\u3042\u308a\u307e\u3059\u306e\u3067\u4f75\u305b\u3066\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%AE%E3%82%AD%E3%83%BC%E3%81%AB%E5%A4%89%E6%95%B0%E3%82%92%E6%8C%87%E5%AE%9A%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95\"><\/span>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u306b\u5909\u6570\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u304a\u3055\u3089\u3044\u306b\u306a\u308a\u307e\u3059\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u57fa\u672c\u5f62\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"object-default.js\" data-lang=\"JavaScript\"><code>let user = {\n  &quot;name&quot;: &quot;mangataro&quot;,\n  &quot;age&quot;: 17,\n  &quot;gender&quot;: &quot;male&quot;,\n  &quot;phone&quot;: &quot;080-XXXX-XXXX&quot;\n};<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><code>user<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5b9a\u7fa9\u3057\u3001\u30d6\u30e9\u30b1\u30c3\u30c8\u8868\u8a18\u6cd5\u3084\u30c9\u30c3\u30c8\u8868\u8a18\u6cd5\u3067\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u57fa\u672c\u5f62\u3067\u3059\u3002\u30d6\u30e9\u30b1\u30c3\u30c8\u8a18\u6cd5\u3068\u30c9\u30c3\u30c8\u8a18\u6cd5\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-what-is-object\/#toc7\">JavaScript \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f\u4f55\u304b\uff1f\u6982\u8981\u3068\u8a18\u8ff0\u65b9\u6cd5\u3092\u57fa\u790e\u304b\u3089\u89e3\u8aac \uff13\uff0e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u53d6\u5f97<\/a>\u300f\u3092\u53c2\u7167\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u3067\u4f8b\u3048\u3070<code>\"name\"<\/code>\u3068\u3044\u3046\u30ad\u30fc\u5024\u3092\u5909\u6570\u3067\u8868\u73fe\u3057\u305f\u3044\u5834\u5408\u3001\u6700\u3082\u5358\u7d14\u3067\u76f4\u611f\u7684\u306a\u65b9\u6cd5\u306f\u6b21\u306e\u3088\u3046\u306b\u8a18\u8f09\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"key-variety.js\" data-lang=\"JavaScript\"><code>const name = &quot;username&quot;;\n\nlet user = {\n  [name]: &quot;mangataro&quot;, \/\/ []\u3067\u5909\u6570\u540d\u3092\u56f2\u3093\u3067\u3042\u3052\u308b\n  &quot;age&quot;: 17,\n  &quot;gender&quot;: &quot;male&quot;,\n  &quot;phone&quot;: &quot;080-XXXX-XXXX&quot;\n};\n\nconsole.log(user);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u521d\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u30ad\u30fc\u5024\u3092<code>\"name\"<\/code>\u3068\u3044\u3046\u6587\u5b57\u5217\u3067\u6307\u5b9a\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u4eca\u56de\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f<code>[name]<\/code>\u3068\u3044\u3046\u8868\u8a18\u306b\u5909\u66f4\u3057\u3066\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u300c<code>[]<\/code>\u300d\u306e\u4e2d\u306b\u5909\u6570\u540d\u3092\u6307\u5b9a\u3057\u3066\u3042\u3052\u308b\u3068\u3046\u307e\u304f\u52d5\u4f5c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u8a18\u3001\u30ad\u30fc\u5024\u3092\u5909\u6570\u3067\u6307\u5b9a\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"console-log-user.js\" data-lang=\"JavaScript\"><code>\/\/ console.log(user)\u306e\u51fa\u529b\u7d50\u679c\n{\n  &quot;username&quot;: &quot;mangataro&quot;,\n  &quot;age&quot;: 17,\n  &quot;gender&quot;: &quot;male&quot;,\n  &quot;phone&quot;: &quot;080-XXXX-XXXX&quot;\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u304d\u3061\u3093\u3068name\u306b\u201dusername\u201d\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u5024\u306b\u5909\u6570\u3092\u6307\u5b9a\u3059\u308b\u5225\u306e\u65b9\u6cd5\u306f\u30d6\u30e9\u30b1\u30c3\u30c8\u8868\u8a18\u6cd5\u306b\u3088\u308b\u8a18\u8ff0\u3067\u3059\u3002\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u306f\u6b21\u306e\u3088\u3046\u306b\u3082\u66f8\u304f\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"object-add-key.js\" data-lang=\"JavaScript\"><code>const name = &quot;username&quot;;\n\nlet user = {\n  &quot;age&quot;: 17,\n  &quot;gender&quot;: &quot;male&quot;,\n  &quot;phone&quot;: &quot;080-XXXX-XXXX&quot;\n};\n\nuser[name] = &quot;mangataro&quot;; \/\/ \u30d6\u30e9\u30b1\u30c3\u30c8\u8868\u8a18\u6cd5\u3067\u5225\u9014\u8ffd\u52a0\u3057\u3066\u3042\u3052\u308b\n\nconsole.log(user);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u5834\u5408\u3001<code>user<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"console-log-user-2.js\" data-lang=\"JavaScript\"><code>\/\/ console.log(user)\u306e\u51fa\u529b\u7d50\u679c\n{\n  &quot;age&quot;: 17,\n  &quot;gender&quot;: &quot;male&quot;,\n  &quot;phone&quot;: &quot;080-XXXX-XXXX&quot;,\n  &quot;username&quot;: &quot;mangataro&quot;\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3068\u306a\u308a\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u672b\u5c3e\u306b<code>\"username\": \"mangataro\"<\/code>\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306f\u9806\u5e8f\u306f\u307b\u307c\u6c17\u306b\u3059\u308b\u3053\u3068\u306f\u306a\u3044\u306e\u3067\u3053\u306e\u65b9\u6cd5\u3067\u3082\u540c\u69d8\u306e\u7d50\u679c\u304c\u5f97\u3089\u308c\u308b\u3068\u8003\u3048\u3066OK\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3069\u3061\u3089\u304c\u826f\u3044\u304b\u306f\u597d\u307f\u306b\u3088\u308a\u307e\u3059\u304c\u3001\u500b\u4eba\u7684\u306b\u306f\u524d\u8005\u304c\u5229\u7528\u3067\u304d\u308b\u5834\u5408\u306b\u306f\u524d\u8005\u306b\u3057\u305f\u65b9\u304c\u8aa4\u8a8d\u306e\u30ea\u30b9\u30af\u304c\u7121\u304f\u306a\u308b\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%A4%89%E6%95%B0%E3%81%A7%E6%8C%87%E5%AE%9A%E3%81%97%E3%81%9F%E3%82%AD%E3%83%BC%E3%81%AB%E3%82%A2%E3%82%AF%E3%82%BB%E3%82%B9%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95\"><\/span>\u5909\u6570\u3067\u6307\u5b9a\u3057\u305f\u30ad\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u5c11\u3057\u66f8\u304d\u63db\u3048\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"user-obj-prop.js\" data-lang=\"JavaScript\"><code>const name = &quot;username&quot;;\n\nlet user = {\n  [name]: &quot;mangataro&quot;, \/\/ []\u3067\u5909\u6570\u540d\u3092\u56f2\u3093\u3067\u3042\u3052\u308b\n  &quot;age&quot;: 17,\n  &quot;gender&quot;: &quot;male&quot;,\n  &quot;phone&quot;: &quot;080-XXXX-XXXX&quot;\n};\n\nconsole.log(user[name]); \/\/ \u30ad\u30fc&quot;username&quot;\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5909\u6570\u3067\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306b\u306f\u5fc5\u305a\u30d6\u30e9\u30b1\u30c3\u30c8\u8868\u8a18\u6cd5\u3092\u7528\u3044\u307e\u3059\u3002\u30c9\u30c3\u30c8\u8868\u8a18\u6cd5\u306b\u3059\u308b\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u304c\u3001<code>\"name\"<\/code>\u304c\u306a\u3044\u3088\u3001\u3068\u3044\u3046<code>undefined<\/code>\u304c\u8fd4\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"dot-subs.js\" data-lang=\"JavaScript\"><code>console.log(user.name); \/\/ \u30c9\u30c3\u30c8\u8868\u8a18\u6cd5\u3067\u306fundefined\n\nconsole.log(user.username); \/\/ mangataro<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u8aac\u660e\u306f\u4e0d\u8981\u304b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u3053\u306e\u5834\u5408<code>user<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc<code>name<\/code>\u3092\u6307\u5b9a\u3057\u3066\u3057\u307e\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u3089\u305a\u3001<code>undefined<\/code>\u3068\u306a\u308a\u307e\u3059\u3002<code>user.username<\/code>\u3067\u3042\u308c\u3070mangataro\u304c\u53d6\u5f97\u53ef\u80fd\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d50\u8ad6\u3068\u3057\u3066\u306f\u3001\u5909\u6570\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306f\u5fc5\u305a\u30d6\u30e9\u30b1\u30c3\u30c8\u8868\u8a18\u6cd5\u306e<code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8[\u5909\u6570\u540d]<\/code>\u3068\u3044\u3046\u5f62\u3092\u3068\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Javasciript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ad\u30fc\u5024\u306b\u5909\u6570\u3092\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u304c\u591a\u3005\u3042\u308a\u307e\u3059\u3002\u30ad\u30fc\u5024\u306b\u540c\u3058\u6587\u5b57\u5217\u3092\u6bce\u56de\u6307\u5b9a\u3059\u308b\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u7169\u96d1\u306b\u306a\u3063\u305f\u308a\u3001\u624b\u9593\u304c\u5897\u3048\u975e\u52b9\u7387\u3067\u3059\u3002 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