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	window.onload=function(){
		var?oDiv=document.getElementsByTagName('div');
		for(var?i=0,leg=oDiv.length;i<leg;i++){
			oDiv[i].alpha=30;//此處應(yīng)該怎么理解？是給oDiv自定義屬性？還是聲明變量？求大神解疑答惑！
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			oDiv[i].onmouseover=function(){
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			oDiv[i].onmouseout=function(){
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		obj.timer=setInterval(function(){
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				obj.alpha+=speed;
				obj.style.filter='alpha(opacity:'+obj.alpha+')';
				obj.style.opacity=obj.alpha/100;
			}
		},30)
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