<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
<style type="text/css">
#div1{
background: red;
height: 100px;
width:100px;
filter:alpha(opacity:30);
opacity:0.3;
-moz-opacity:0.3;
-khtml-opacity:0.3;
}
</style>
<script type="text/javascript">
window.onload=function (){
var oDiv=document.getElementById('div1');
//alert(getComputedStyle(oDiv,false).opacity);
oDiv.onmouseover=function ()
{
startMove(100);
};
oDiv.onmouseout=function ()
{
startMove(30);
};
}
var i=0;
function startMove(iTarget)
{
var timer=null;
var oDiv=document.getElementById('div1');
var speed=0;
var opa=getComputedStyle(oDiv,false).opacity*100;
clearInterval(timer);
timer= setInterval(function()
{
i++;
console.log(i);
var opa=getComputedStyle(oDiv,false).opacity*100;
if(opa<iTarget){
speed=10;
}else if(opa>iTarget){
speed=-10;
}
if(opa==iTarget){
clearInterval(timer);
}else{
document.getElementById('txt').value='iTarget:'+iTarget+','+'speed:'+speed+','+'opa:'+opa+'timer'+timer;
// alert('iTarget:'+iTarget+','+'speed:'+speed+','+'opa:'+opa);
opa+=speed;
oDiv.style.opacity=opa/100;
}
},30);
}
</script>
</head>
<body>
<div id="div1"></div>
<input id="txt" style='width:600px' type="text" name="">
</body>
</html>
定时器，setInterval
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转载自blog.csdn.net/qq_27891995/article/details/85157527
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