IT戦記 - 一行㧠IE ã® JavaScript を高速化ã™ã‚‹æ–¹æ³•ä»¥ä¸‹ã®ä¸€è¡Œã‚’ã™ã¹ã¦ã® JavaScript ã®å‰ã«èªã¿è¾¼ã‚€ /*@cc_on _d=document;eval('var document=_d')@*/ ã“ã®ä¸€è¡Œã‚’èªã¿è¾¼ã‚€ã“ã¨ã«ã‚ˆã£ã¦ IE ã§ã® document ã¸ã®ã‚¢ã‚¯ã‚»ã‚¹ãŒ 5 å€é€Ÿããªã‚Šã¾ã™ã€‚ ãŸã¨ãˆã° 以下ã®ã‚ˆã†ã«ã€èªã¿è¾¼ã‚€å‰ã¨èªã¿è¾¼ã‚“ã 後を比較ã—ã¦ã¿ã¾ã™ã€‚ // Before var date = new Date; for (var i = 0; i < 100000; i++) document; alert(new Date - date); // 643 /*@cc_on _d=document;eval('var document=_d')@*/ // After date = new Date; for (var i = 0; i < 100000; i++) document; alert(new Date -
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