{"author_name":"takuya_1st","image_url":"http://cdn-ak.f.st-hatena.com/images/fotolife/t/takuya_1st/20160602/20160602152936.jpg","blog_url":"https://takuya-1st.hatenablog.jp/","version":"1.0","categories":["javascript"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftakuya-1st.hatenablog.jp%2Fentry%2F2016%2F06%2F02%2F161227\" title=\"ES/JavaScript\u306ethis\u3068\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u77e5\u3063\u3066\u304a\u304f\u3079\u304d\u3053\u3068 - \u305d\u308c\u30de\u30b0\u3067\uff01\" 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","description":"this. \u3053\u306e\u4fbf\u5229\u3067\u30cf\u30de\u308a\u3069\u3053\u308d\u306e\u591a\u3044\u5909\u6570 Array.forEach / map \u7cfb \u306ethisArg \u304c\u5b89\u5b9a\u3057\u306a\u3044\u3002 this \u5909\u6570\u306e\u7d39\u4ecb this \u5909\u6570\u306e\u4f8b apply , call window \u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u30b3\u30fc\u30eb\u30d0\u30c3\u30af \u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9 Array.forEach \u500b\u4eba\u7684\u306a\u7d50\u8ad6 this \u306f\u3067\u304d\u308b\u3060\u3051\u907f\u3051\u308b \u8abf\u3079\u305f\u30ad\u30c3\u30ab\u30b1\u306f Array.forEach arr = [\"A\",\"B\",\"C\"] arr.forEach( function ( x ) { console.log ( this ) } ) \u3053\u306ethis\u3068\u3057\u3066 this => [\u201cA\u201d,\u201cB\u201d,\u201cC\u201d] \u3092\u671f\u5f85\u3057\u305f\u308f\u3051\u3067\u2026","width":"100%","height":"190","url":"https://takuya-1st.hatenablog.jp/entry/2016/06/02/161227","title":"ES/JavaScript\u306ethis\u3068\u30a2\u30ed\u30fc\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u77e5\u3063\u3066\u304a\u304f\u3079\u304d\u3053\u3068","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/takuya_1st/","blog_title":"\u305d\u308c\u30de\u30b0\u3067\uff01","provider_name":"Hatena Blog","published":"2016-06-02 16:12:27"}