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<body><SCRIPT LANGUAGE="JavaScript">
var  s = "";
s += "\r\nÍøÒ³¿É¼ûÇøÓò¿í£º"+ document.body.clientWidth;
s += "\r\nÍøÒ³¿É¼ûÇøÓò¸ß£º"+ document.body.clientHeight;
s += "\r\nÍøÒ³¿É¼ûÇøÓò¿í£º"+ document.body.offsetWidth  +" (°üÀ¨±ßÏߺ͹ö¶¯ÌõµÄ¿í)";
s += "\r\nÍøÒ³¿É¼ûÇøÓò¸ß£º"+ document.body.offsetHeight +" (°üÀ¨±ßÏߵĿí)";
s += "\r\nÍøÒ³ÕýÎÄÈ«ÎÄ¿í£º"+ document.body.scrollWidth;
s += "\r\nÍøÒ³ÕýÎÄÈ«Îĸߣº"+ document.body.scrollHeight;
s += "\r\nÍøÒ³±»¾íÈ¥µÄ¸ß£º"+ document.body.scrollTop;
s += "\r\nÍøÒ³±»¾íÈ¥µÄ×ó£º"+ document.body.scrollLeft;
s += "\r\nÍøÒ³ÕýÎIJ¿·ÖÉÏ£º"+ window.screenTop;
s += "\r\nÍøÒ³ÕýÎIJ¿·Ö×ó£º"+ window.screenLeft;
s += "\r\nÆÁÄ»·Ö±æÂʵĸߣº"+ window.screen.height;
s += "\r\nÆÁÄ»·Ö±æÂÊµÄ¿í£º"+ window.screen.width;
s += "\r\nÆÁÄ»¿ÉÓù¤×÷Çø¸ß¶È£º"+ window.screen.availHeight;
s += "\r\nÆÁÄ»¿ÉÓù¤×÷Çø¿í¶È£º"+ window.screen.availWidth;
s += "\r\nÄãµÄÆÁÄ»ÉèÖÃÊÇ "+ window.screen.colorDepth +" Î»²ÊÉ«";
s += "\r\nÄãµÄÆÁÄ»ÉèÖà"+ window.screen.deviceXDPI +" ÏñËØ/Ó¢´ç";
alert(s);
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[·­Òë]High Performance JavaScript(020)

Yielding with Timers  Óö¨Ê±Æ÷Èóöʱ¼äƬ
    Despite your best efforts, there will be times when a JavaScript task cannot be completed in 100 milliseconds or less because of its complexity. In these cases, it's ideal to yield control of the UI thread so that UI updates may occur ......

[·­Òë]High Performance JavaScript(023)

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    When considering data transmission techniques, you must take into account several factors: feature set, compatibility, performance, and direction (to or from the server). When considering data formats, the only scale you need for comparison is speed.
......

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Summary  ×ܽá
    When web pages or applications begin to feel slow, analyzing assets as they come over the wire and profiling scripts while they are running allows you to focus your optimization efforts where they are needed most.
    µ±ÍøÒ³»òÓ¦ÓóÌÐò±äÂýʱ£¬·ÖÎ ......
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