qq_SakuraSakura_03906596
2016-09-01 19:34
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>getStyle-1</title> <style type="text/css"> *{margin: 0;padding: 0;border: 0;} ul li{ list-style-type: none; margin: 10px; background-color: #2e9fdb; width: 200px; height: 100px; border: 1px solid red; filter:alpha(opacity:30); opacity: 0.3; } </style> </head> <body> <ul> <li id="li1"></li> </ul> <script> var li1=document.getElementById("li1"); li1.onmouseover=function(){ startMove(this,"width",400); }; li1.onmouseout=function(){ startMove(this,"width",100); }; var timer=null; // alert(0.03*100)//3 // alert(0.07*100)//7.000000000001 // alert(Math.round(0.07*100))//7, 四舍五入取整 function startMove(obj,aTtr,iTarget){ clearInterval(timer); timer=setInterval(function(){ var iCur=0; if(aTtr=="opacity"){ iCur=Math.round(parseFloat(getStyle(obj,aTtr))*100); } else{ iCur=parseInt(getStyle(obj,aTtr)); } var speed=(iTarget-iCur)/8; speed=speed>0?Math.ceil(speed):Math.floor(speed); if(iCur==iTarget){ clearInterval(timer); } else{ if(aTtr="opacity"){ obj.style.filter="alpha(opacity:"+(iCur+speed)+")"; obj.style.opacity=(iCur+speed)/100; } else { obj.style[aTtr]=iCur+speed+"px"; } } },30) } function getStyle(obj,attr){ if(obj.currentStyle){ return obj.currentStyle[attr]; } else{ return getComputedStyle(obj,false)[attr]; } } </script> </body> </html>
53行aTtr=="opacity"
JS动画效果
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