{"id":4049,"date":"2020-03-16T14:35:41","date_gmt":"2020-03-16T05:35:41","guid":{"rendered":"https:\/\/learningbox.co.jp\/?p=4049"},"modified":"2020-03-26T16:29:18","modified_gmt":"2020-03-26T07:29:18","slug":"blog_java-script","status":"publish","type":"post","link":"https:\/\/learningbox.co.jp\/en\/2020\/03\/16\/blog_java-script\/","title":{"rendered":"What is JavaScript \"prototype\"?"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u958b\u767a\u90e8\u306e\u4e0a\u689d\u3067\u3059\u3002<br \/>\n\u4eca\u56de\u306e\u8a18\u4e8b\u3067\u306fJavaScript\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3044\u305f\u3057\u307e\u3059\u3002\u306a\u308b\u3079\u304f\u308f\u304b\u308a\u3084\u3059\u304f\u8a18\u4e8b\u306b\u307e\u3068\u3081\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u672c\u7a3f\u3082\u3069\u3046\u305e\u3088\u308d\u3057\u304f\u304a\u9858\u3044\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<p class=\"mokujimidasi\">\u76ee\u6b21\u306f\u3053\u3061\u3089<\/p>\n<ul class=\"mokuji\">\n<li>\uff11.\u3000prototype\u306f\u4e8c\u7a2e\u985e\u5b58\u5728\u3059\u308b\uff1f\uff1f<\/li>\n<li>\uff12.\u3000\u95a2\u6570\u304c\u6301\u3064 prototype (\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u9664\u304f)<\/li>\n<li>\uff13.\u3000\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6301\u3064 [[Prototype]]<\/li>\n<li>\uff14.\u3000\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u3068\u306f<\/li>\n<li>\uff15.\u3000\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u4f55\u304c\u826f\u3044\u306e\u304b<\/li>\n<\/ul>\n<h2 id=\"mokuji1\" class=\"anchor\">prototype\u306f\u4e8c\u7a2e\u985e\u5b58\u5728\u3059\u308b\uff1f\uff1f<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/java-script-1024x328.png\" alt=\"java-script\" width=\"1024\" height=\"328\" class=\"alignnone size-large wp-image-4268\" srcset=\"https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/java-script-1024x328.png 1024w, https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/java-script-300x96.png 300w, https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/java-script-768x246.png 768w, https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/java-script.png 1282w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>JavaScript\u306eprototype\u3068\u8868\u73fe\u3055\u308c\u308b\u3082\u306e\u306b\u306f\u4e8c\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<br \/>\n\u95a2\u6570\u304c\u6301\u3064  <code>prototype<\/code> \u3068<br \/>\n\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6301\u3064\u5185\u90e8\u30d7\u30ed\u30d1\u30c6\u30a3 <code>[[Prototype]]<\/code> \u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u4e8c\u3064\u306eprototype\u304cJavaScript\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306e\u7406\u89e3\u3092\u96e3\u3057\u304f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2 id=\"mokuji2\" class=\"anchor\">\u95a2\u6570\u304c\u6301\u3064 prototype<\/h2>\n<p>\u3053\u306eprototype\u306f\u76f4\u63a5\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<br \/>\n\u8a66\u3057\u306bObject\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u6301\u3064prototype\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"hljs\"><code><div>\r\n<span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-built_in\">Object<\/span>.prototype);\r\n\r\n<\/div><\/code><\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-4.png\" alt=\"\" width=\"546\" height=\"326\" class=\"alignnone size-full wp-image-4064\" srcset=\"https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-4.png 546w, https:\/\/learningbox.co.jp\/wp-content\/uploads\/2020\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-4-300x179.png 300w\" sizes=\"auto, (max-width: 546px) 100vw, 546px\" \/><\/p>\n<p>\u3053\u306e<code>prototype<\/code>\u306f\u898b\u3066\u306e\u901a\u308a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u306fjavascript\u304c\u4e88\u3081\u7528\u610f\u3057\u3066\u3044\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u8a73\u7d30\u306fMDN\u306eObject\u304b\u3089\u78ba\u8a8d\u51fa\u6765\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\">MDN \u6a19\u6e96\u30d3\u30eb\u30c8\u30a4\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3010Object\u3011<\/a><\/p>\n<p>\u3072\u3068\u307e\u305a\u3001\u95a2\u6570\u306b\u306fprototype\u3068\u3044\u3046\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308c\u3070\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n<h2 id=\"mokuji3\" class=\"anchor\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6301\u3064 [[Prototype]]<\/h2>\n<p>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u751f\u6210\u6642\u3001\u65b0\u305f\u306b\u751f\u6210\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3001<br \/>\n\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u95a2\u6570\u306e <code>prototype<\/code> \u306e<code>\u53c2\u7167<\/code>\u3092\u3082\u3063\u305f\u3001\u5185\u90e8\u30d7\u30ed\u30d1\u30c6\u30a3 <code>[[Prototype]]<\/code> \u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<br \/>\n\u30a4\u30e1\u30fc\u30b8\u3068\u3057\u3066\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u3059\u3002<\/p>\n<pre class=\"hljs\"><code><div>\r\n<span class=\"hljs-keyword\">const<\/span> newObj = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Object<\/span>();\r\n\u2193\r\nnewObj.[[Prototype]] = <span class=\"hljs-built_in\">Object<\/span>.prototype;\r\n\r\n<\/div><\/code><\/pre>\n<p>\u3053\u306e <code>[[prototype]]<\/code> \u306f newObj.[[prototype]] \u3068\u3044\u3046\u98a8\u306b\u53c2\u7167\u3059\u308b\u3053\u3068\u306f\u51fa\u6765\u307e\u305b\u3093\u3002<\/p>\n<p><code>Object.getPrototypeOf()<\/code> \u3084 <code>__proto__\u30d7\u30ed\u30d1\u30c6\u30a3<\/code>(\u975e\u63a8\u5968) \u3092\u4f7f\u7528\u3057\u3066\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n<pre class=\"hljs\"><code><div>\r\n<span class=\"hljs-keyword\">const<\/span> newObj = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Object<\/span>();\r\n<span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-built_in\">Object<\/span>.getPrototypeOf(newObj) === <span class=\"hljs-built_in\">Object<\/span>.prototype); <span class=\"hljs-comment\">\/\/ true<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(newObj.__proto__ === <span class=\"hljs-built_in\">Object<\/span>.prototype); <span class=\"hljs-comment\">\/\/ true<\/span>\r\n\r\n<\/div><\/code><\/pre>\n<p>\u3053\u3053\u304b\u3089\u5148\u306f\u308f\u304b\u308a\u3084\u3059\u3055\u512a\u5148\u3067 <code>[[prototype]]<\/code> \u306f <code>__proto__<\/code> \u3092\u4f7f\u3063\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2 id=\"%E3%83%97%E3%83%AD%E3%83%88%E3%82%BF%E3%82%A4%E3%83%97%E3%83%81%E3%82%A7%E3%83%BC%E3%83%B3%E3%81%A8%E3%81%AF\">\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u3068\u306f<\/h2>\n<p>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u3068\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u53c2\u7167\u3057\u3088\u3046\u3068\u3057\u305f\u6642\u306b\u3001<br \/>\n\u305d\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u306a\u3051\u308c\u3070\u3001<code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8.__proto__<\/code>\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u63a2\u3057\u306b\u884c\u304f\u4ed5\u7d44\u307f\u3067\u3059\u3002<br \/>\n\u66f4\u306b<code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8.__proto__<\/code>\u306b\u3082\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u306a\u3051\u308c\u3070\u3001<code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8.__proto__.__proto__<\/code>\u306b&#8230;<br \/>\n\u3068\u3044\u3046\u3075\u3046\u306b <code>null<\/code> \u306b\u306a\u308b\u307e\u3067\u63a2\u3057\u306b\u884c\u304d\u307e\u3059\u3002<br \/>\n\u4f8b\u3048\u3070<\/p>\n<pre class=\"hljs\"><code><div>\r\n<span class=\"hljs-keyword\">const<\/span> newObj = {<span class=\"hljs-attr\">name<\/span>: <span class=\"hljs-string\">'\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8'<\/span>};\r\n<span class=\"hljs-built_in\">console<\/span>.log(newObj.toString()); <span class=\"hljs-comment\">\/\/ [object Object]<\/span>\r\n\r\n<\/div><\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f <code>newObj<\/code> \u306b\u306f <code>toString()<\/code> \u30e1\u30bd\u30c3\u30c9\u306f\u5b58\u5728\u3057\u3066\u3044\u306a\u3044\u306f\u305a\u3067\u3059\u304c\u3001\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<br \/>\n\u3053\u308c\u306f\u4e0b\u306e\u3088\u3046\u306a\u52d5\u304d\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<ol>\n<li><code>newObj<\/code> \u306b <code>toString()<\/code> \u30e1\u30bd\u30c3\u30c9\u304c\u7121\u3044\u304b\u63a2\u3059\u3002<\/li>\n<li>\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u306e\u3067 <code>newObj.__proto__<\/code> \u3064\u307e\u308a <code>Object.prototype<\/code> \u306b <code>toString()<\/code> \u30e1\u30bd\u30c3\u30c9\u304c\u7121\u3044\u304b\u63a2\u3059\u3002<\/li>\n<li>\u898b\u3064\u304b\u3063\u305f\u70ba\u547c\u3073\u51fa\u3059\u3002(newObj.__proto__.toString())<\/li>\n<\/ol>\n<p>\u7d50\u679c\u3000[object Object]<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u53c2\u7167\u3057\u305f\u3044\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u306a\u3044\u5834\u5408\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306eprototype\u3092\u63a2\u3057\u306b\u3044\u304f\u4ed5\u7d44\u307f\u3092<code>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3<\/code>\u3068\u8a00\u3044\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057\u6700\u5f8c\u307e\u3067\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"hljs\"><code><div>\r\n<span class=\"hljs-keyword\">const<\/span> newObj = {<span class=\"hljs-attr\">name<\/span>: <span class=\"hljs-string\">'\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8'<\/span>};\r\n<span class=\"hljs-built_in\">console<\/span>.log(newObj.toArray()); <span class=\"hljs-comment\">\/\/ newObj.toArrayis not a function<\/span>\r\n\r\n<\/div><\/code><\/pre>\n<ol>\n<li><code>newObj<\/code> \u306b <code>toArray()<\/code> \u30e1\u30bd\u30c3\u30c9\u304c\u7121\u3044\u304b\u63a2\u3059\u3002<\/li>\n<li>\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u306e\u3067 <code>newObj.__proto__<\/code> \u306b <code>toArray()<\/code> \u30e1\u30bd\u30c3\u30c9\u3092\u63a2\u3059\u3002<\/li>\n<li>\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u306e\u3067 <code>newObj.__proto__.__proto__<\/code> \u306b&#8230;  <\/li>\n<li><code>newObj.__proto__.__proto__<\/code> \u306f null \u306a\u306e\u3067\u7d42\u4e86\u3002<\/li>\n<\/ol>\n<p>\u7d50\u679c\u3000newObj.toArrayis not a function<\/p>\n<p>prototype\u306f\u62e1\u5f35\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u306e\u3067\u3042\u3089\u304b\u3058\u3081toArray\u30e1\u30bd\u30c3\u30c9\u3092\u7528\u610f\u3057\u3066\u3044\u308c\u3070\u4e0b\u306e\u3088\u3046\u306b\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n<pre class=\"hljs\"><code><div>\r\n<span class=\"hljs-built_in\">Object<\/span>.prototype.toArray = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\r\n  <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-built_in\">Object<\/span>.values(<span class=\"hljs-keyword\">this<\/span>);\r\n}\r\n<span class=\"hljs-keyword\">const<\/span> newObj = {<span class=\"hljs-attr\">name<\/span>: <span class=\"hljs-string\">'\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8'<\/span>};\r\n<span class=\"hljs-built_in\">console<\/span>.log(newObj.toArray()); <span class=\"hljs-comment\">\/\/ [\"\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\"]<\/span>\r\n\r\n<\/div><\/code><\/pre>\n<p>\u4eca\u56de\u306e\u4f8b\u3067\u306f\u30d3\u30eb\u30c8\u30a4\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u308bObject\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eprototype\u3092\u62e1\u5f35\u3057\u307e\u3057\u305f\u304c\u3001\u57fa\u672c\u7684\u306b\u306f\u30d3\u30eb\u30c8\u30a4\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u89e6\u308b\u306e\u306f\u3001\u3088\u304f\u306a\u3044\u3053\u3068\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u7406\u7531\u306f\u8272\u3005\u3042\u308a\u307e\u3059\u306e\u3067\u6c17\u306b\u306a\u3063\u305f\u65b9\u306f\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2 class=\"anchor\">\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u4f55\u304c\u826f\u3044\u306e\u304b<\/h2>\n<p>JavaScript\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u5168\u3066\u30b3\u30d4\u30fc\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u76f4\u63a5\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3068\u3001\u751f\u6210\u3057\u305f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u6570\u3060\u3051\u30e1\u30bd\u30c3\u30c9\u304c\u4f5c\u6210\u3055\u308c\u3001\u30e1\u30e2\u30ea\u306e\u6d88\u8cbb\u304c\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002<br \/>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u6697\u9ed9\u7684\u306a\u53c2\u7167\u304c\u6301\u3066\u308b\u306e\u3067\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<br 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