{"width":"100%","blog_url":"https://suiginto.hatenadiary.org/","published":"2007-02-03 19:36:55","provider_url":"https://hatena.blog","url":"https://suiginto.hatenadiary.org/entry/20070203/1170499015","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsuiginto.hatenadiary.org%2Fentry%2F20070203%2F1170499015\" title=\" \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u9023\u60f3\u914d\u5217 - Today I abandon\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","type":"rich","image_url":null,"categories":["JavaScript"],"author_name":"suiginto","blog_title":"Today I abandon","title":" \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u9023\u60f3\u914d\u5217","author_url":"https://blog.hatena.ne.jp/suiginto/","provider_name":"Hatena Blog","description":"JavaScript \u306e\u914d\u5217\u3068\u9023\u60f3\u914d\u5217\u306e\u9055\u3044 - IT\u6226\u8a18 \u9023\u60f3\u914d\u5217\u3067 for in \u3092\u4f7f\u3046\u6642\u3067\u3082 Object.prototype.hoge = \"Foo\"; \u3068\u304b\u3057\u3066\u305f\u3089\u307e\u305a\u3044\u3088\u3046\u306a\u6c17\u304c\u3057\u307e\u3059\u304c\u3069\u3046\u3067\u3057\u3087\u3046\u3002 \u3058\u3083\u3042\u3069\u3046\u3057\u305f\u3089\u3044\u3044\u3093\u3060\u308d\u3046\u3002\u30eb\u30fc\u30d7\u5185\u3067 hasOwnProperty \u3068\u304b\u3067\u30c1\u30a7\u30c3\u30af?\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff1d\u9023\u60f3\u914d\u5217\u3068\u3044\u3046\u306e\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u5f37\u529b\u306a\u6a5f\u69cb\u3067\u306f\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u9023\u60f3\u914d\u5217\u3068\u3057\u3066\u4f7f\u3046\u5834\u5408\u306b\u306f\u4f7f\u3044\u3065\u3089\u3044\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u3088\u304f\u601d\u3044\u307e\u3059\u3002 \u4f8b\u3048\u3070 function assocEmptyHash(key){ var hash = {}; return hash[key]; } \u3068\u3044\u3046\u95a2\u6570\u3092\u8003\u3048\u307e\u3059\u3002\u3053\u2026","height":"190"}