{"provider_url":"https://hatena.blog","version":"1.0","height":"190","categories":["JavaScript"],"description":"null\u30c1\u30a7\u30c3\u30af\u3001undefined\u30c1\u30a7\u30c3\u30af\u3001\u3053\u308c\u3089\u3092\u4e21\u65b9\u66f8\u304f\u306e\u306f\u3057\u305f\u304f\u306a\u3044\u3002 \u2193\u3053\u3093\u306a\u306e\u3002 if (val === null || val === undefined) { } \u3067\u3082\u3053\u308c\u3089\u306e\u5024\u306e\u9055\u3044\u3092\u660e\u78ba\u306b\u3057\u3066\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u30d7\u30ed\u30c0\u30af\u30c8\u3082\u3042\u307e\u308a\u306a\u3044\u3002 \u306e\u3067\u3001\u4e00\u822c\u7684\u306b===\u3067\u53b3\u5bc6\u306b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u671b\u307e\u3057\u3044\u304c\u3001\u7a7a\u5024\u306e\u30c1\u30a7\u30c3\u30af\u306b\u95a2\u3057\u3066\u306f\u3001 if (val == null) { } \u3068\u66f8\u304f\u3053\u3068\u3082\u3042\u308a\u304b\u3082\u3002 \u304a\u3088\u305d\u7a7a\u5024\u306b\u4f7f\u7528\u3055\u308c\u3046\u308b\u5024\u306b\u3064\u3044\u3066\u306enull\u3068\u306e==\u7d50\u679c\u306f\u4ee5\u4e0b\u3002 \u3061\u3083\u3093\u3068\uff08\uff1f\uff09undefined\u306e\u3068\u304d\u3060\u3051true\u306b\u306a\u3063\u3066\u304f\u308c\u308b\u3002 console.log(null == undefined) \u2026","url":"https://natech12.hatenadiary.jp/entry/2020/06/13/170739","title":"\u3010JS\u3011null, undefined\u30c1\u30a7\u30c3\u30af\u306b\u3064\u3044\u3066","blog_url":"https://natech12.hatenadiary.jp/","type":"rich","provider_name":"Hatena Blog","author_name":"natech12","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnatech12.hatenadiary.jp%2Fentry%2F2020%2F06%2F13%2F170739\" title=\"\u3010JS\u3011null, undefined\u30c1\u30a7\u30c3\u30af\u306b\u3064\u3044\u3066 - natech12&#39;s blog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","image_url":null,"blog_title":"natech12's blog","published":"2020-06-13 17:07:39","author_url":"https://blog.hatena.ne.jp/natech12/"}