<!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"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>t透明度动画</title></head><style>body,div{ margin:0; padding:0; } #div1{ width:200px; height:200px; background:red; filter:alpha(opacity:30); opacity:0.3; }</style><script> window.onload=function(){ var oDiv=document.getElementById('div1'); oDiv.onmouseover=function(){ startMove(100); } oDiv.onmouseout=function(){ startMove(30); } }var timer=null;var alpha=30;function startMove(iTarget){ var oDiv=document.getElementById('div1'); clearInterval(timer); timer=setInterval(function(){ var speed=0; if(alpha>iTarget){speed=-10;} else{speed=10;} if(alpha==iTarget){clearInterval(timer);} else{alpha+=speed; oDiv.style.filter='alpha(opacity:'+alpha+')'; oDiv.style.opacity=alpha/100; } },30)}</script><body><div id="div1"></div></body></html>其中，oDiv.style.filter='alpha(opacity:'+alpha+')';
filter:alpha(opacity:30);
去掉后没有变化啊，求赐教，我实在没看懂
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