让FF和IE离得更近
给FF添加了IE专有的属性和方法:

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举个例子,在FF中使用currentStyle:
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<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'><html xmlns='http://www.w3.org/1999/xhtml' xml:lang='cn' lang='cn'><head><style type="text/css">#a{width:100px;height:100px;background-color:yellow;}</style><script type="text/javascript"> window.onload=function(){ HTMLElement.prototype.__defineGetter__("currentStyle", function(){return this.ownerDocument.defaultView.getComputedStyle(this,null);}); //上面一行代码就给所有的HTML元素添加了currentStyle属性 var a=document.getElementById("a"); alert("style中的width=""+a.style.width+""\tcurrentStyle中的width=""+a.currentStyle.width+"""); } </script></head><body> <div id="a"></div></body></html>?
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