{"id":25328,"date":"2017-06-16T17:09:59","date_gmt":"2017-06-16T08:09:59","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=25328"},"modified":"2024-05-06T11:43:17","modified_gmt":"2024-05-06T02:43:17","slug":"%e3%80%90javascript%e4%bd%bf%e3%81%84%e5%bf%85%e8%a6%8b%ef%bc%81%e3%80%91%e3%82%b3%e3%83%b3%e3%82%b9%e3%83%88%e3%83%a9%e3%82%af%e3%82%bf%e3%82%92%e4%bd%bf%e3%81%86%e3%81%a8%e3%81%8d%e3%81%aetips","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/25328","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4f7f\u3044\u65b9(new\/prototype\/overload)"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\uff01\u30e9\u30a4\u30bf\u30fc\u306e\u30e8\u30b7\u30c0\u30b8\u30e5\u30f3\u3067\u3059\u3002<\/p>\n

JavaScript\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u300c\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u300d<\/strong><\/span>\u3092\u3054\u5b58\u77e5\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n

\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u578b\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e<\/strong><\/span>\u306b\u306f\u3042\u308b\u6982\u5ff5\u306a\u306e\u3067\u3001\u99b4\u67d3\u307f\u306e\u3042\u308b\u65b9\u3082\u591a\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n

\u3061\u306a\u307f\u306b\u3001JavaScript\u306fECMAScript 2015(ES6)\u3088\u308a\u4ee5\u524d\u306f\u30af\u30e9\u30b9\u69cb\u6587\u304c\u3042\u308a\u307e\u305b\u3093<\/strong><\/span>\u3067\u3057\u305f\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<\/p>\n

\u30fb\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f
\n\u30fb\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5<\/strong><\/span><\/p>\n

\u3068\u3044\u3046\u3001\u982d\u306b\u5165\u308c\u3066\u304a\u304f\u3068\u3088\u3044\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<\/p>\n

\u30fb\u64ec\u4f3c\u7684\u306b\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3059\u308b\u65b9\u6cd5
\n\u30fb\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306ereturn\u5024\u306b\u3064\u3044\u3066
\n\u30fb\u30af\u30e9\u30b9\u306e\u4f5c\u6210(ECMAScript 2015\u4ee5\u964d)<\/strong><\/span><\/p>\n

\u3068\u3044\u3063\u305f\u5fdc\u7528\u7de8\u306b\u95a2\u3057\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u4eca\u56de\u306f\u305d\u3093\u306a\u300c\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u300d\u306b\u3064\u3044\u3066\u3001\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/p>\n

\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f<\/h2>\n

JavaScript\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f<\/h3>\n

\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u3044\u3046\u5358\u8a9e\u3092\u805e\u304f\u3068\u3001\u30bb\u30c3\u30c8\u3067\u3064\u3044\u3066\u304f\u308b\u306e\u304c\u30af\u30e9\u30b9<\/strong><\/span>\u306e\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u304c\u3001\u5b9f\u306fJavaScript\u306b\u306f\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/strong><\/span>\u3002<\/p>\n

\u3057\u304b\u3057\u3001ECMAScript 2015(ES6)\u304b\u3089\u30af\u30e9\u30b9\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/strong><\/span><\/p>\n

ECMAScript 2015(ES6)\u3088\u308a\u4ee5\u524d\u3067\u306f<\/p>\n

\u300c\u30af\u30e9\u30b9\u304c\u306a\u3044\u306e\u306b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308b\u3063\u3066\u3069\u3046\u3044\u3046\u3053\u3068\u3060\u308d\u3046\uff1f\u300d<\/strong><\/span><\/p>\n

\u3068\u7591\u554f\u3092\u6301\u305f\u308c\u305f\u65b9\u3082\u3044\u3089\u3063\u3057\u3083\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u7126\u3089\u305a\u306b\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n

\u9806\u756a\u306b\u3054\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u305d\u3082\u305d\u3082\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u306f\u4f55\u306a\u306e\u3067\u3057\u3087\u3046\uff1f<\/p>\n

\u65e5\u672c\u8a9e\u306b\u8a33\u3059\u3068\u300c\u69cb\u7bc9\u5b50\u300d\u306b\u306a\u308a\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9(\u5b9f\u4f53)<\/strong><\/span>\u3092\u4f5c\u6210\u3059\u308b\u95a2\u6570\u306e\u3053\u3068\u3092\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n

\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u3088\u3063\u3066\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u308a\u3001\u521d\u671f\u5316\u3082\u884c\u3044\u307e\u3059<\/strong><\/span>\u3002<\/p>\n

\u5909\u6570\u306f\u5ba3\u8a00\u3057\u305f\u3060\u3051\u3067\u306f\u305f\u3060\u306e\u7bb1\u306e\u3088\u3046\u306a\u3082\u306e<\/strong><\/span>\u3067\u3042\u308a\u3001\u5024\u3092\u4ee3\u5165\u3057\u305f\u6642\u70b9\u3067\u521d\u671f\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u306b\u3042\u308b\u30af\u30e9\u30b9\u3082\u3001\u5909\u6570\u3068\u540c\u3058\u3088\u3046\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u521d\u671f\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u305d\u306e\u3068\u304d\u306b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n

\u3057\u304b\u3057\u3001\u4e0a\u3067ECMAScript 2015(ES6)\u3088\u308a\u4ee5\u524d\u306fJavaScript\u306b\u306f\u30af\u30e9\u30b9\u304c\u306a\u3044<\/strong><\/span>\u3068\u3044\u3046\u3053\u3068\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u5b9f\u306f\u3001JavaScript\u3067\u306f\u95a2\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u7591\u4f3c\u7684\u306a\u30af\u30e9\u30b9\u3092\u5b9f\u73fe\u3067\u304d\u308b\u4ed5\u7d44\u307f\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n

\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n

JavaScript\u3067\u306f\u3001ECMAScript 2015(ES6)\u3088\u308a\u4ee5\u524d\u306ffunction\u3067\u7591\u4f3c\u7684\u306a\u30af\u30e9\u30b9\u3092\u4f5c\u3063\u305f\u308a<\/strong><\/span>\u3001new\u6f14\u7b97\u5b50<\/strong><\/span>\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n

\u5b9f\u969b\u306b\u7591\u4f3c\u7684\u306a\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u3054\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n

\u4ee5\u4e0b\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n

function Person(name, age) {\r\n  this.name = name;\r\n  this.age = age;\r\n}\r\n<\/pre>\n
Person\u3068\u3044\u3046\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5b9a\u7fa9\u3057\u3066\u3001\u305d\u306e\u4e2d\u306b\u540d\u524d\u3092\u8868\u3059name\u3068\u3001\u5e74\u9f62\u3092\u8868\u3059age\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u300cthis\u300d\u3092\u4ed8\u3051\u3066\u3044\u308b\u306e\u306b\u3082\u7406\u7531\u304c\u3042\u308a\u307e\u3059\u3002<\/strong><\/span><\/p>\n
\u5b9f\u969b\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u300cnew Person()\u300d\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3057\u3066\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
var person1 = new Person('\u592a\u90ce', 22);\r\nvar person2 = new Person('\u6b21\u90ce', 31);\r\n\r\nconsole.log( person1.name );\r\nconsole.log( person1.age );\r\n \r\nconsole.log( person2.name );\r\nconsole.log( person2.age );\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
\u592a\u90ce\r\n22\r\n \r\n\u6b21\u90ce\r\n31\r\n<\/pre>\n
\u300cnew\u300d\u3092\u4ed8\u3051\u308b\u3053\u3068\u3067\u3001\u751f\u6210\u3055\u308c\u308b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u300cthis\u300d\u306b\u30bb\u30c3\u30c8\u3055\u308c\u308b<\/strong><\/span>\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u300cnew Person(‘\u592a\u90ce’, 22)\u300d\u306ethis\u306bperson1\u304c\u30bb\u30c3\u30c8\u3055\u308c\u3001\u300cnew Person(\u2018\u6b21\u90ce’, 31)\u300d\u306ethis\u306bperson2\u304c\u30bb\u30c3\u30c8\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5<\/h2>\n
\u6b21\u306b\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u306e\u65b9\u6cd5\u3068\u3057\u3066\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u3067\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5<\/strong><\/span>\u3068\u3001prototype\u3092\u4f7f\u3063\u305f\u65b9\u6cd5<\/strong><\/span>\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u3067\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5<\/h3>\n
\u307e\u305a\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u3067\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n
var Person = function(name, age) {\r\n    this.name = name;\r\n    this.age  = age;\r\n\r\n    this.setName = function(name) {\r\n        this.name = name;\r\n    }\r\n    this.getName = function() {\r\n        return this.name;\r\n    }\r\n}\r\n<\/pre>\n
\u3053\u306e\u65b9\u6cd5\u306e\u5834\u5408\u3001Person\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u547c\u3073\u51fa\u3059\u305f\u3073\u306bsetName\u30e1\u30bd\u30c3\u30c9\u3068getName\u30e1\u30bd\u30c3\u30c9\u304c\u30b3\u30d4\u30fc\u3055\u308c\u3001\u30e1\u30e2\u30ea\u5bb9\u91cf\u3092\u6d88\u8cbb\u3059\u308b\u3068\u3044\u3046\u30c7\u30e1\u30ea\u30c3\u30c8<\/strong><\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
prototype\u3092\u4f7f\u3063\u3066\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5<\/h3>\n
\u6b21\u306bprototype\u3092\u4f7f\u3063\u305f\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u306e\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n
prototype\u3068\u3044\u3046\u306e\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u4e00\u7a2e\u3067\u3001\u6700\u521d\u306f\u7a7a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u300c\u53c2\u7167\u300d<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u300c\u53c2\u7167\u300d\u3068\u3044\u3046\u306e\u306f\u30c7\u30fc\u30bf\u305d\u306e\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u30e1\u30e2\u30ea\u4e0a\u306e\u4ed6\u306e\u5834\u6240\u306b\u3042\u308b\u30c7\u30fc\u30bf\u3092\u6307\u3059\u3082\u306e\u3067\u3059\u3002<\/p>\n
prototype\u3092\u4f7f\u3063\u3066\u5b9a\u7fa9\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u751f\u6210\u3055\u308c\u308b\u305f\u3073\u306b\u30b3\u30d4\u30fc\u3055\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093<\/strong><\/span>\u3002<\/p>\n
\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6301\u3063\u3066\u3044\u308b\u306e\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u4f53\u3067\u306f\u306a\u304f\u300c\u53c2\u7167\u300d\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n
\u30e1\u30bd\u30c3\u30c9\u304c\u30b3\u30d4\u30fc\u3055\u308c\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u30e1\u30e2\u30ea\u306e\u7bc0\u7d04\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u3001prototype\u3092\u4f7f\u3063\u305f\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n
var Person = function(name, age) {\r\n    if(!(this instanceof Person)) {\r\n        return new Person(name, age);\r\n    }\r\n    this.name = name;\r\n    this.age  = age;\r\n}\r\n\r\nPerson.prototype.setName = function(name) {\r\n    this.name = name;\r\n}\r\nPerson.prototype.getName = function() {\r\n    return this.name;\r\n}\r\n<\/pre>\n
prototype\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3044\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5916\u3067\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u3092\u884c\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n
\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010JavaScript\u5165\u9580\u3011\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306e\u4f7f\u3044\u65b9\u3068\u7d99\u627f\u307e\u3068\u3081\uff01<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
\u64ec\u4f3c\u7684\u306b\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3059\u308b\u65b9\u6cd5<\/h2>\n
\u30b1\u30fc\u30b9\u306b\u3088\u3063\u3066\u306f\u3001\u5f15\u6570\u306e\u6570\u304c\u9055\u3046\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u8907\u6570\u7528\u610f\u3057\u3066\u304a\u304d\u305f\u3044<\/strong><\/span>\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070\u3001\u5f15\u6570\u304c1\u500b\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30682\u500b\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e2\u3064\u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306a\u3069\u3067\u3059\u3002<\/p>\n
\u3053\u308c\u30921\u3064\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u5b9f\u73fe\u3057\u305f\u3044\u5834\u5408<\/strong><\/span>\u306f\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n
\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
function Cat(name, age) {\r\n \r\n\/\/\u671f\u5f85\u3057\u305f\u5f15\u6570\u304c\u5165\u529b\u3055\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u521d\u671f\u5024\u3092\u8a2d\u5b9a\r\n  if ( name === undefined ) name = '\u533f\u540d';\r\n  if ( age === undefined ) age = '\u4e0d\u660e';\r\n \r\n  \/\/\u6307\u5b9a\u306e\u5f15\u6570\u4ee5\u4e0a\u304c\u5165\u529b\u3055\u308c\u305f\u5834\u5408\u306e\u6761\u4ef6\u5206\u5c90\u51e6\u7406\r\n  if ( arguments.length > 2 ) alert('\u5f15\u6570\u3092\u6b63\u3057\u304f\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044');\r\n \r\n  this.name = name;\r\n  this.age = age;\r\n}\r\n \r\n\/\/\u5f15\u6570\u30921\u3064\u3057\u304b\u8a2d\u5b9a\u3057\u306a\u3044\u5834\u5408\r\nvar cat1 = new Cat( '\u304b\u3093\u306a' );\r\n \r\nconsole.log( cat1 );\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
Cat { name: \"\u304b\u3093\u306a\", age: \"\u4e0d\u660e\" }\r\n<\/pre>\n
\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001Cat\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f5c\u6210\u3057\u300c\u540d\u524d\u300d\u3068\u300c\u5e74\u9f62\u300d\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong><\/span>\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u5b9f\u969b\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u6642\u306b\u3001\u672c\u6765\u306f2\u3064\u306e\u5f15\u6570\u3092\u8a2d\u5b9a\u3059\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u540d\u524d\u3057\u304b\u8a2d\u5b9a\u3057\u306a\u3044\u5834\u5408\u306b\u6761\u4ef6\u5206\u5c90\u3067\u521d\u671f\u5024\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n
\u4eca\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u3060\u3068\u300c\u5e74\u9f62\u300d\u304c\u5165\u529b\u3055\u308c\u3066\u3044\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u521d\u671f\u5024\u3067\u3042\u308b\u300c\u4e0d\u660e\u300d\u304c\u8a2d\u5b9a<\/strong><\/span>\u3055\u308c\u305f\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u3053\u308c\u306f\u3001\u671f\u5f85\u3057\u3066\u3044\u305f\u5f15\u6570\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u300cundefined\u300d\u306b\u306a\u308b\u7279\u6027\u3092\u5229\u7528<\/strong><\/span>\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u304c\u3001\u9006\u306b\u5f15\u6570\u304c\u591a\u3044\u5834\u5408\u306b\u306f\u300carguments\u300d\u3092\u4f7f\u3063\u3066\u6761\u4ef6\u5206\u5c90<\/strong><\/span>\u3092\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306ereturn\u5024\u306b\u3064\u3044\u3066<\/h2>\n
\u901a\u5e38\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u4f7f\u3044\u65b9\u3068\u3057\u3066\u306f\u3001\u65b0\u3057\u3044this\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u3066return\u3067\u8fd4\u3059<\/strong><\/span>\u3068\u3044\u3046\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u7570\u306a\u308b\u70b9\u3068\u3057\u3066\u306f\u3001\u660e\u793a\u7684\u306bthis\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u305f\u308areturn\u3092\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044<\/strong><\/span>\u3068\u3044\u3046\u70b9\u3067\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
var Dog = function () {\r\n    \/\/var this = {}; \u306e\u8a18\u8ff0\u306f\u3044\u3089\u306a\u3044\r\n\r\n    this.name = 'pochi';\r\n \r\n    \/\/return this; \u306e\u8a18\u8ff0\u306f\u3044\u3089\u306a\u3044\r\n};\r\n \r\nvar myDog = new Dog();\r\n\r\nconsole.log( myDog.name );\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
pochi\r\n<\/pre>\n
\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u3044\u308b\u90e8\u5206\u3092\u898b\u308b\u3068\u5206\u304b\u308a\u307e\u3059\u304c\u3001\u65b0\u3057\u304fthis\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u3063\u305f\u308a\u3001\u305d\u306ethis\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092return\u3067\u8fd4\u3059\u51e6\u7406\u306f\u4e0d\u8981\u3068\u3044\u3046\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u610f\u56f3\u7684\u306b\u4efb\u610f\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092return<\/strong><\/span>\u3057\u3066\u3057\u307e\u3046\u3068\u4e88\u60f3\u3068\u306f\u9055\u3046\u52d5\u4f5c\u3092\u3057\u307e\u3059\u3002<\/p>\n
\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n
var Dog = function () {\r\n    this.name = 'pochi';\r\n    \r\n    \/\/\u610f\u56f3\u7684\u306b\u7a7a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u3066\u307f\u308b\r\n    return {};\r\n};\r\n \r\nvar myDog = new Dog();\r\n\r\nconsole.log( myDog.name );\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
undefined\r\n<\/pre>\n
\u4e0a\u8a18\u306e\u5834\u5408\u3001\u7a7a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300c{}\u300d\u3092\u8fd4\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u305f\u3081\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3063\u3066name\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u306e\u3067undefined\u30a8\u30e9\u30fc\u3068\u306a\u3063\u3066\u3057\u307e\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n
\u3057\u304b\u3057\u3001\u4ee5\u4e0b\u306e\u5834\u5408\u306f\u7570\u306a\u308b\u52d5\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
var Dog = function () {\r\n    this.name = 'pochi';\r\n    \r\n    \/\/\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u4ee5\u5916\u306e\u4efb\u610f\u306e\u57fa\u672c\u578b\u3092\u8fd4\u3059\r\n    return 1;\r\n};\r\n \r\nvar myDog = new Dog();\r\n\r\nconsole.log( myDog.name );\r\n<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
pochi\r\n<\/pre>\n
\u3053\u306e\u5834\u5408\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u30671\u3068\u3044\u3046\u6570\u5024\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u304c\u3001undefined\u30a8\u30e9\u30fc\u3067\u306f\u306a\u304fthis\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6b63\u3057\u304f\u8fd4\u3055\u308c\u3066name\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u304b\u3089\u5206\u304b\u308b\u306e\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u3067\u751f\u6210\u3057\u305f\u6570\u5024\u306a\u3069\u306e\u57fa\u672c\u578b\u306f\u7121\u8996\u3055\u308c<\/strong><\/span>\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u3067\u751f\u6210\u3057\u305f\u4efb\u610f\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u306f\u8fd4\u3055\u308c\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n
\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u623b\u308a\u5024\u3092\u6b63\u3057\u304f\u7406\u89e3\u3057\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n
\u30af\u30e9\u30b9\u306e\u4f5c\u6210(ECMAScript 2015\u4ee5\u964d)<\/h2>\n
ECMAScript 2015(ES6)\u304b\u3089JavaScript\u3067\u3082\u30af\u30e9\u30b9\u304c\u5c0e\u5165<\/strong><\/span>\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\u30af\u30e9\u30b9\u306fJavaScript\u306b\u3059\u3067\u306b\u3042\u308b\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30d9\u30fc\u30b9\u7d99\u627f\u306e\u7cd6\u8863\u69cb\u6587<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
\u7cd6\u8863\u69cb\u6587<\/strong><\/span>\u3068\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306b\u304a\u3044\u3066\u8aad\u307f\u66f8\u304d\u306e\u3057\u3084\u3059\u3055\u306e\u305f\u3081\u306b\u5c0e\u5165\u3055\u308c\u308b\u66f8\u304d\u65b9<\/strong><\/span>\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u3067\u3059\u306e\u3067\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u7d99\u627f\u30e2\u30c7\u30eb\u304c\u5c0e\u5165\u3055\u308c\u305f\u306e\u3067\u306f\u306a\u304f\u3001\u8907\u96d1\u3067\u308f\u304b\u308a\u306b\u304f\u3044\u66f8\u304d\u65b9\u3068\u5168\u304f\u540c\u3058\u610f\u5473\u306b\u306a\u308b\u3082\u306e\u3092\u3001\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u3067\u308f\u304b\u308a\u3084\u3059\u3044\u66f8\u304d\u65b9\u3067\u66f8\u3051\u308b<\/strong><\/span>\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9\u306f\u3042\u308b\u30af\u30e9\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u524d\u306b\u3001\u305d\u306e\u30af\u30e9\u30b9\u3092\u5ba3\u8a00<\/strong><\/span>\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9\u306e\u5b9a\u7fa9<\/h3>\n
\u30af\u30e9\u30b9\u306e\u5b9a\u7fa9\u306e\u4f8b\u3092\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
class Person {\r\n    constructor(name, age) {\r\n        this.name = name;\r\n        this.age = age;\r\n    }\r\n}\r\n\r\nvar person = new Person('\u592a\u90ce', 22);\r\n\r\nconsole.log( person.name );\r\nconsole.log( person.age );<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
\u592a\u90ce\r\n22<\/pre>\n
\u30af\u30e9\u30b9\u3067\u306f\u30e1\u30bd\u30c3\u30c9\u540dconstructor<\/strong><\/span>\u3067\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n
\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9<\/h3>\n
\u30af\u30e9\u30b9\u5185\u306b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
class Person {\r\n    constructor(name, age) {\r\n        this.name = name;\r\n        this.age = age;\r\n    }\r\n    \r\n    get result() {\r\n        this.checkAge();\r\n    }\r\n    \r\n    checkAge() {\r\n        if(this.age < 20) {\r\n            console.log(this.name + '\u306f\u672a\u6210\u5e74\u3067\u3059');\r\n        } else {\r\n            console.log(this.name + '\u306f\u6210\u4eba\u3067\u3059');\r\n        }\r\n    }\r\n}\r\n\r\nvar person = new Person('\u592a\u90ce', 22);\r\nperson.result;<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
\u592a\u90ce\u306f\u6210\u4eba\u3067\u3059<\/pre>\n
\u30af\u30e9\u30b9\u306e\u7d99\u627f<\/h3>\n
Java\u3084C++\u3001C#\u306a\u3069\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u306e\u3088\u3046\u306b\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3057\u3066\u6a5f\u80fd\u3092\u8ffd\u52a0<\/strong><\/span>\u3055\u305b\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3059\u308b\u306b\u306f\u3001extends<\/strong><\/span>\u53e5\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
class Person {\r\n    constructor(name, age) {\r\n        this.name = name;\r\n        this.age = age;\r\n    }\r\n}\r\n\r\nclass ChildPerson extends Person {\r\n    get result() {\r\n        this.checkAge();\r\n    }\r\n    \r\n    checkAge() {\r\n        if(this.age < 20) {\r\n            console.log(this.name + '\u306f\u672a\u6210\u5e74\u3067\u3059');\r\n        } else {\r\n            console.log(this.name + '\u306f\u6210\u4eba\u3067\u3059');\r\n        }\r\n    }\r\n}\r\n\r\nvar person = new ChildPerson('\u592a\u90ce', 22);\r\nperson.result;<\/pre>\n
\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
\u592a\u90ce\u306f\u6210\u4eba\u3067\u3059<\/pre>\n
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