{"height":"190","categories":["js","\u9ad8\u901f\u5316"],"title":" +new Date \u3092 Date.now() \u306b\u5dee\u3057\u66ff\u3048\u308b\u3068200\u301c400% \u9ad8\u901f\u5316\u3082","description":"CSS \u3092\u5229\u7528\u3057\u305f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5fc5\u305a\u73fe\u5728\u6642\u523b\u3092\u53d6\u5f97\u3059\u308b\u30b3\u30fc\u30c9\u304c\u5165\u308a\u307e\u3059\u3002 var now = +new Date; ECMAScript-262 5th \u3067\u306f Date.now() \u304c\u65b0\u3057\u304f\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002 Date.now() \u306f +new Date \u3068\u540c\u3058\u6a5f\u80fd(\u73fe\u5728\u6642\u523b\u3092\u6570\u5024\u3067\u8fd4\u3059)\u3092\u6301\u3061\u306a\u304c\u3089\u3001new \u306e\u5fc5\u8981\u304c\u306a\u3044\u305f\u3081\u901f\u305d\u3046\u3067\u3059\u3002 \u30d9\u30f3\u30c1