\u3010JavaScript\u5165\u9580\u3011\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4f7f\u3044\u65b9(new\/prototype\/overload)<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n \n
prototype\u3092\u4f7f\u3063\u3066\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5<\/h3>\n
\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u300d\u3092\u6301\u3063\u3066\u3044\u308b\u3068\u5192\u982d\u3067\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002\u5148\u307b\u3069\u4f5c\u6210\u3057\u305f\u300cUser\u300d\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u306f\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u3060\u3051\u304c\u8a18\u8ff0\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u30e1\u30bd\u30c3\u30c9\u3082\u4e00\u7dd2\u306b\u5b9a\u7fa9\u3059\u308b\u5834\u5408\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u52b9\u7387\u7684\u306b\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306e\u4e00\u822c\u7684\u306a\u8a18\u8ff0\u65b9\u6cd5\u306f\u3001<\/p>\n
\u3010 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540d.prototype.\u30e1\u30bd\u30c3\u30c9\u540d= function() { } \u3011<\/p>\n
\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3067\u8a18\u8ff0\u3059\u308b\u3068\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u306e\u969b\u306b\u30e1\u30bd\u30c3\u30c9\u306f\u300c\u53c2\u7167\u300d\u3057\u3066\u5229\u7528\u3055\u308c\u307e\u3059\uff01<\/p>\n
\u30b3\u30d4\u30fc\u304c\u4f5c\u3089\u308c\u308b\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
![\"javascript-prototype-img3\"](\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/04\/javascript-prototype-img3.jpg\")
<\/p>\n
\u57fa\u672c\u7684\u306b\u30e1\u30bd\u30c3\u30c9\u306f\u3069\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5148\u3067\u3082\u5185\u5bb9\u306f\u540c\u3058\u306a\u306e\u3067\u3001\u4e00\u7dd2\u306b\u30b3\u30d4\u30fc\u3059\u308b\u306e\u306f\u7121\u99c4\u306b\u306a\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u8907\u96d1\u306a\u30e1\u30bd\u30c3\u30c9\u3092100\u500b\u304f\u3089\u3044\u6301\u3064\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3001\u6570\u5341\u500b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b\u3068\u30e1\u30e2\u30ea\u306e\u5727\u8feb\u306f\u6df1\u523b\u3067\u3059\u3002\u5927\u91cf\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u3063\u305f\u5834\u5408\u3001\u30b3\u30d4\u30fc\u3060\u3068\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u5ea6\u306b\u30e1\u30e2\u30ea\u304c\u5727\u8feb\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u300c\u53c2\u7167\u300d\u3067\u3042\u308c\u3070\u3001\u5927\u91cf\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u3063\u305f\u3068\u3057\u3066\u3082\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u5ea6\u306b\u30e1\u30e2\u30ea\u304c\u5727\u8feb\u3055\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
var User = function(name, age) {\r\n this.name = name;\r\n this.age = age;\r\n}\r\n\r\nUser.prototype.getName = function() {\r\n return this.name;\r\n}<\/pre>\n\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cUser\u300d\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5b9a\u7fa9\u3060\u3051\u306b\u306a\u3063\u3066\u3044\u308b\u70b9\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u305d\u3057\u3066\u3001\u300cprototype\u300d\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3063\u3066\u300cgetName()\u300d\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
prototype\u3092\u4f7f\u308f\u306a\u3044\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u4e8b\u4f8b<\/h3>\n
\u3061\u306a\u307f\u306b\u3001prototype\u3092\u4f7f\u308f\u306a\u3044\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u4f8b\u3092\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
var User = function(name, age) {\r\n this.name = name;\r\n this.age = age;\r\n \r\n\r\n \/\/\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\r\n this.getName = function() {\r\n return this.name;\r\n }\r\n}<\/pre>\n\u3053\u306e\u4f8b\u3067\u306f\u3001User\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u300cgetName()\u300d\u3068\u3044\u3046\u540d\u524d\u3092\u53d6\u5f97\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057prototype\u3092\u4f7f\u308f\u306a\u3044\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u305f\u5834\u5408\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3059\u308b\u5ea6\u306b\u30e1\u30bd\u30c3\u30c9\u3082\u4e00\u7dd2\u306b\u30b3\u30d4\u30fc\u3055\u308c\u308b\u306e\u3067\u3001\u7121\u99c4\u306a\u30e1\u30e2\u30ea\u3092\u6d88\u8cbb\u3057\u3066\u3057\u307e\u3044\u307e\u3059\uff01
\n![\"javascript-prototype-img2\"](\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/04\/javascript-prototype-img21.jpg\")
<\/p>\n
prototype\u5b9a\u7fa9\u306e\u7c21\u7d20\u5316<\/h2>\n
\u3055\u3066\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u30e1\u30e2\u30ea\u3092\u6700\u9069\u5316\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u3057\u304b\u3057\u3001\u3053\u306e\u307e\u307e\u3060\u3068\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u8a18\u8ff0\u304c\u8907\u96d1\u306b\u306a\u308a\u53ef\u8aad\u6027\u3084\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u304c\u96e3\u3057\u304f\u306a\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
var User = function(name, age) {\r\n this.name = name;\r\n this.age = age;\r\n}\r\n\r\n\r\nUser.prototype.getName = function() {\r\n return this.name;\r\n}\r\n\r\nUser.prototype.getAge = function() {\r\n return this.age;\r\n}<\/pre>\n\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cgetName()\u300d\u300cgetAge()\u300d\u3068\u3044\u30462\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3068\u3053\u308d\u304c\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u304c30\u500b\u301c50\u500b\u3068\u5897\u3048\u3066\u304d\u305f\u5834\u5408\u306b\u7ba1\u7406\u304c\u96e3\u3057\u304f\u306a\u308b\u3068\u601d\u3044\u307e\u305b\u3093\u304b\uff1f\u4f8b\u3048\u3070\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540d\u304c\u300cUser\u300d\u304b\u3089\u300cMember\u300d\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u306b\u306a\u3063\u305f\u3089\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002<\/p>\n
\u305d\u3053\u3067\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u5b9a\u7fa9\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5f62\u5f0f\u3067\u8a18\u8ff0\u3059\u308b\u3053\u3068\u30671\u3064\u306b\u307e\u3068\u3081\u308b\u624b\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff01<\/p>\n
\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
User.prototype = {\r\n getName: function() {\r\n return this.name;\r\n },\r\n\r\n getAge: function() {\r\n return this.age;\r\n }\r\n}<\/pre>\n\u300cUser.prototype\u300d\u306b\u7d9a\u3051\u3066\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5f62\u5f0f\u3067\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u3066\u3082\u3001\u6700\u521d\u306e\u66f8\u304d\u65b9\u3068\u307e\u3063\u305f\u304f\u540c\u3058\u3053\u3068\u3092\u5b9f\u73fe\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3067\u3042\u308c\u3070\u3001\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u30921\u3064\u306b\u307e\u3068\u3081\u3089\u308c\u308b\u3046\u3048\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540d\u306e\u5909\u66f4\u3082\u5bb9\u6613\u3067\u3059\u306d\uff01<\/p>\n
\u300cprototype\u300d\u306b\u3088\u308b\u7d99\u627f<\/h2>\n
\u3053\u306e\u7ae0\u3067\u306f\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u6d3b\u7528\u3057\u305f\u300c\u7d99\u627f\u300d\u306e\u3057\u304f\u307f\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n
\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3042\u308b\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u300d\u3084\u7d99\u627f\u306e\u4f5c\u308a\u65b9\u306a\u3069\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n
\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u306e\u4ed5\u7d44\u307f\u306b\u3064\u3044\u3066<\/h3>\n
\u307e\u305a\u306f\u3001\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u300d\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n
\u3053\u308c\u306f\u6587\u5b57\u901a\u308a\u3001\u5404\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6301\u3063\u3066\u3044\u308b\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u300d\u3092\u30c1\u30a7\u30fc\u30f3\u306e\u3088\u3046\u306b\u9023\u7d50\u3057\u3066\u304a\u4e92\u3044\u3092\u53c2\u7167\u3067\u304d\u308b\u4ed5\u7d44\u307f\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
var User = function() {};\r\nvar MemberA = function() {};\r\nvar MemberB = function() {};<\/pre>\n\u3053\u306e\u4f8b\u3067\u306f\u3001\u4e2d\u8eab\u304c\u7a7a\u3063\u307d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30923\u3064\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u305d\u3053\u3067\u3001\u3053\u306e3\u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u305d\u308c\u305e\u308c\u6301\u3063\u3066\u3044\u308b\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u300d\u3092\u9023\u7d50\u3055\u305b\u308b\u306b\u306f\u3069\u3046\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u304b\uff1f\u5b9f\u306f\u3001\u5404\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u306f\u9023\u7d50\u3055\u305b\u305f\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4ee3\u5165\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\uff01<\/p>\n
\u6b21\u306e\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
MemberA.prototype = new User();<\/pre>\n\u3053\u308c\u306f\u300cMemberA\u300d\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u300cUser\u300d\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4ee3\u5165\u3057\u3066\u3044\u308b\u4f8b\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u300cUser\u300d\u3068\u300cMemberA\u300d\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u305d\u308c\u305e\u308c\u53c2\u7167\u3067\u304d\u308b\u72b6\u614b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3055\u3089\u306b\u3001\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n
MemberB.prototype = new MemberA();<\/pre>\n\u4eca\u5ea6\u306f\u3001\u300cMemberA\u300d\u3068\u300cMemberB\u300d\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u540c\u58eb\u3092\u9023\u7d50\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u4e21\u8005\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u53c2\u7167\u95a2\u4fc2\u306b\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u300cMemberB\u300d\u3068\u300cUser\u300d\u3082\u540c\u3058\u3088\u3046\u306b\u53c2\u7167\u95a2\u4fc2\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3064\u307e\u308a\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u300cUser \/ MemberA \/ MemberB\u300d\u304c\u305d\u308c\u305e\u308c\u7e4b\u304c\u3063\u305f\u308f\u3051\u3067\u3059\u3002\u4eca\u56de\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4e2d\u8eab\u304c\u7a7a\u3063\u307d\u3067\u3057\u305f\u304c\u3001\u901a\u5e38\u306a\u3089\u300cUser\u300d\u306e\u6a5f\u80fd\u3092\u300cMemberB\u300d\u304c\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u306a\u308f\u3051\u3067\u3059\u3002<\/p>\n
prototype\u3092\u6d3b\u7528\u3057\u305f\u7d99\u627f\u306e\u4f5c\u308a\u65b9<\/h3>\n
\u5148\u307b\u3069\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u304c\u5206\u304b\u3063\u305f\u3089\u3001JavaScript\u306e\u300c\u7d99\u627f\u300d\u306f\u7c21\u5358\u3067\u3059\uff01<\/p>\n
\u3068\u3001\u8a00\u3046\u306e\u3082\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u300d\u304c\u300c\u7d99\u627f\u300d\u306e\u4ed5\u7d44\u307f\u305d\u306e\u3082\u306e\u3060\u3068\u8a00\u3063\u3066\u3082\u904e\u8a00\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
var User = function() {};\r\nvar Member = function() {};\r\n\r\nUser.prototype.hello = function() {\r\n return '\u3053\u3093\u306b\u3061\u306f\uff01';\r\n}\r\n\r\nMember.prototype = new User();<\/pre>\n\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cUser\u300d\u300cMember\u300d2\u3064\u306e\u4e2d\u8eab\u304c\u7121\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u305d\u3057\u3066\u3001User\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u300chello()\u300d\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u72b6\u614b\u3067\u300cMember\u300d\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u300cUser\u300d\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4ee3\u5165\u3059\u308b\u3068\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u306e\u7ae0\u3067\u89e3\u8aac\u3057\u305f\u901a\u308a\u3001\u300cMember\u300d\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3082\u300chello()\u300d\u30e1\u30bd\u30c3\u30c9\u304c\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3088\u306d\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u8a18\u8ff0\u3092\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n
var User = function() {};\r\nvar Member = function() {};\r\n \r\nUser.prototype.hello = function() {\r\n return '\u3053\u3093\u306b\u3061\u306f\uff01';\r\n}\r\n\r\nMember.prototype = new User();\r\n\r\nvar taro = new User();\r\nvar hanako = new Member();\r\n \r\nconsole.log( taro.hello() );\r\nconsole.log( hanako.hello() );<\/pre>\n\u5b9f\u884c\u7d50\u679c<\/p>\n
\u3053\u3093\u306b\u3061\u306f\uff01\r\n\u3053\u3093\u306b\u3061\u306f\uff01<\/pre>\n\u3053\u306e\u4f8b\u3067\u306f\u3001\u300cUser \/ Member\u300d\u305d\u308c\u305e\u308c\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u6ce8\u76ee\u3057\u3066\u6b32\u3057\u3044\u306e\u306f\u5b9f\u884c\u7d50\u679c\u3067\u3059\u3002\u3069\u3061\u3089\u3082\u300chello()\u300d\u30e1\u30bd\u30c3\u30c9\u304c\u5b9f\u884c\u3067\u304d\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n
\u3064\u307e\u308a\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u306b\u3088\u3063\u3066\u300cUser\u300d\u3068\u300cMember\u300d\u304c\u7e4b\u304c\u308b\u3053\u3068\u3067\u300c\u7d99\u627f\u300d\u3092\u5b9f\u73fe\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002\u3055\u3089\u306b\u300c\u7d99\u627f\u300d\u306b\u3064\u3044\u3066\u77e5\u8b58\u3092\u6df1\u3081\u305f\u3044\u65b9\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u3055\u307e\u3056\u307e\u306a\u7d99\u627f\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n \n \n
\n
\n
![](\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/05\/javascript-inheritance-re2-150x86.jpg\")
\n <\/div>\n
\n
\u3010JavaScript\u5165\u9580\u3011\u521d\u5fc3\u8005\u3067\u3082\u5206\u304b\u308b\u7d99\u627f\u306e\u4f5c\u308a\u65b9\uff08ES2015\u5bfe\u5fdc\uff09<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n \n
\u307e\u3068\u3081<\/h2>\n
\u4eca\u56de\u306f\u3001JavaScript\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3092\u3057\u307e\u3057\u305f\uff01<\/p>\n
\u6700\u5f8c\u306b\u3001\u3082\u3046\u4e00\u5ea6\u30dd\u30a4\u30f3\u30c8\u3092\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n
\n
\n- \u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u30d9\u30fc\u30b9\u306b\u30b3\u30d4\u30fc\u3092\u3059\u308b\u3053\u3068\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3067\u304d\u308b<\/b><\/li>\n
- \u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u30e1\u30e2\u30ea\u6d88\u8cbb\u3092\u6291\u5236\u3067\u304d\u308b<\/b><\/li>\n
- \u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u7d99\u627f\u3092\u5b9f\u73fe\u3067\u304d\u308b<\/b><\/li>\n<\/ul>\n<\/div>\n
\u4e0a\u8a18\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u3066\u3001\u305c\u3072\u81ea\u5206\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u53d6\u308a\u5165\u308c\u3066\u6d3b\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u9811\u5f35\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3053\u3093\u306b\u3061\u306f\u3001\u30e9\u30a4\u30bf\u30fc\u306e\u30de\u30b5\u30c8\u3067\u3059\uff01 \u4eca\u56de\u306f\u3001JavaScript\u3067\u300c\u7d99\u627f\u300d\u3092\u5b9f\u73fe\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3082\u3042\u308b\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u300d\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3092\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u300c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u300d\u3092\u4f7f\u3046\u3068\u30e1\u30e2\u30ea […]<\/p>\n","protected":false},"author":4,"featured_media":47734,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2346],"tags":[95,1488],"class_list":["post-47722","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript-study","tag-javascript","tag-prototype"],"acf":[],"yoast_head":"\n
\u3010JavaScript\u5165\u9580\u3011\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306e\u4f7f\u3044\u65b9\u3068\u7d99\u627f\u307e\u3068\u3081\uff01 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010JavaScript\u5165\u9580\u3011\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306e\u4f7f\u3044\u65b9\u3068\u7d99\u627f\u307e\u3068\u3081\uff01 \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sejuku.net\/blog\/47722\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010JavaScript\u5165\u9580\u3011\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306e\u4f7f\u3044\u65b9\u3068\u7d99\u627f\u307e\u3068\u3081\uff01 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010JavaScript\u5165\u9580\u3011\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306e\u4f7f\u3044\u65b9\u3068\u7d99\u627f\u307e\u3068\u3081\uff01 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