{"published":"2007-11-26 09:40:33","blog_url":"https://m-hiyama.hatenablog.com/","height":"190","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/m-hiyama/","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fm-hiyama.hatenablog.com%2Fentry%2F20071126%2F1196037633\" title=\"JavaScript\u5927\u57df\u5909\u6570\u306e\u5b58\u5728\u78ba\u8a8d - \u6a9c\u5c71\u6b63\u5e78\u306e\u30ad\u30de\u30a4\u30e9\u98fc\u80b2\u8a18 (\u306f\u3066\u306aBlog)\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","width":"100%","image_url":null,"title":"JavaScript\u5927\u57df\u5909\u6570\u306e\u5b58\u5728\u78ba\u8a8d","blog_title":"\u6a9c\u5c71\u6b63\u5e78\u306e\u30ad\u30de\u30a4\u30e9\u98fc\u80b2\u8a18 (\u306f\u3066\u306aBlog)","categories":["\u96d1\u8a18\uff0f\u5099\u5fd8"],"url":"https://m-hiyama.hatenablog.com/entry/20071126/1196037633","version":"1.0","description":"[\u8ffd\u8a18]id:zorio\u3055\u3093\u306e\u30d6\u30c3\u30af\u30de\u30fc\u30af\u30b3\u30e1\u30f3\u30c8\u306e\u6307\u6458\u306b\u3088\u308a\u3001\u629c\u3051\u3066\u3044\u305f\u300c.apply\u300d\u3092\u633f\u5165\u3057\u307e\u3057\u305f\u3002[/\u8ffd\u8a18]JavaScript\u3067\u3001\u5927\u57df\u5909\u6570\uff08\u5927\u57df\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\uff09foo\u304c\u5b58\u5728\u3057\u306a\u3044\u3068\u304d\u306b\u4f55\u304b\u3092\u3057\u305f\u3044\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001\u3053\u3093\u306a\u66f8\u304d\u65b9\u3092\u3057\u307e\u3059\u3088\u306d\u3002 if (!foo) { // \u4f55\u304b }\u3067\u3082\u3001\u5f0f !foo \u306f\u3001foo\u304cnull\u3067\u3082false\u3067\u30820\u3067\u3082true\u306b\u8a55\u4fa1\u3055\u308c\u307e\u3059\u3002 if (foo == undefined) { // \u4f55\u304b }\u3068\u3057\u305f\u307b\u3046\u304c\u3088\u3055\u305d\u3046\u3067\u3059\u3002\u304c\u3001null == undefined \u3082true\u3068\u306a\u308b\u306e\u3067\u3042\u307e\u308a\u6539\u5584\u3055\u308c\u3066\u307e\u305b\u3093\u3002 if (foo === unde\u2026","author_name":"m-hiyama","type":"rich"}