{"provider_name":"Hatena Blog","categories":["JavaScript"],"type":"rich","blog_url":"https://pashango-p.hatenadiary.org/","width":"100%","author_url":"https://blog.hatena.ne.jp/pashango_p/","image_url":null,"published":"2011-04-25 16:37:54","description":"\u6700\u8fd1\u3001JavaScript\u3092\u4f7f\u3046\u3053\u3068\u306b\u306a\u3063\u305f\u306e\u3067\u52c9\u5f37\u4e2d\u3002 \u30c7\u30d5\u30a9\u30eb\u30c8\u5f15\u6570\u304c\u4f7f\u3044\u305f\u3044\u306a\u3068\u601d\u3044\u30b0\u30b0\u3063\u305f\u3068\u3053\u308d\u3001\u4e0b\u306e\u30b3\u30fc\u30c9\u304c\u6ca2\u5c71\u30d2\u30c3\u30c8\u3059\u308b\u3002 def test(a) { a = a || \u30c7\u30d5\u30a9\u30eb\u30c8\u5024 ... } \u3048\u3001\u3053\u308c\u3063\u3066\u30c7\u30d5\u30a9\u30eb\u30c8\u5f15\u6570\u304c0\u3084False\u306e\u5834\u5408\u30c0\u30e1\u3060\u3088\u306d\u30fb\u30fb\u30fb\uff1f \u6b63\u3057\u304f\u306f\u3053\u3046\u3060\u3068\u601d\u3046\u3093\u3060\u304c\u30fb\u30fb\u30fb def test(a) { if(a === undefined) a = \u30c7\u30d5\u30a9\u30eb\u30c8\u5024; ... } \u300ca == undefined\u300d\u3067\u306f\u306a\u304f\u300ca === undefined\u300d\u306a\u306e\u3067\u6ce8\u610f\u3002JavaScript\u306b\u8a73\u3057\u3044\u65b9\u3067\u3001\u4fee\u6b63\u304c\u3042\u308a\u307e\u3057\u305f\u3089\u3054\u6307\u6458\u304f\u3060\u3055\u3044\u3002[\u8ffd\u8a18] \u30b3\u30e1\u30f3\u30c8\u304b\u3089\u6307\u6458\u304c\u3042\u308a\u2026","url":"https://pashango-p.hatenadiary.org/entry/20110425/1303717074","title":"JavaScript\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5f15\u6570\u3092\u4f7f\u3046","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fpashango-p.hatenadiary.org%2Fentry%2F20110425%2F1303717074\" title=\"JavaScript\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5f15\u6570\u3092\u4f7f\u3046 - Pashango\u2019s Blog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","blog_title":"Pashango\u2019s Blog","version":"1.0","author_name":"pashango_p"}