{"provider_url":"https://hatena.blog","url":"https://javascripter.hatenablog.com/entry/20081105/1225881958","width":"100%","height":"190","author_name":"javascripter","blog_url":"https://javascripter.hatenablog.com/","categories":["javascript"],"version":"1.0","title":"__proto__ = null","image_url":null,"blog_title":"\u7d20\u4eba\u304c\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u52c9\u5f37\u3057\u3066\u3044\u305f\u30d6\u30ed\u30b0","type":"rich","description":"__proto__\u30d7\u30ed\u30d1\u30c6\u30a3\u306bnull\u3092\u4ee3\u5165\u3059\u308b\u3068\u3001Object.prototype\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3057\u306a\u3044\u30af\u30ea\u30fc\u30f3\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u624b\u306b\u5165\u308c\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002 var o = {__proto__: null}; console.log(typeof o.toString); // undefined console.log('__proto__' in o); // false console.log(typeof o.__proto__); // undefined console.log(Object.getPrototypeOf(o)); // null console.log(o ins\u2026","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/javascripter/","published":"2008-11-05 19:45:58","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjavascripter.hatenablog.com%2Fentry%2F20081105%2F1225881958\" title=\"__proto__ = null - \u7d20\u4eba\u304c\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u52c9\u5f37\u3057\u3066\u3044\u305f\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}