没有出现透明度改变效果
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#box1{ width:200px; height:200px; background-color:red; opacity:0.3;}
</style>
</head>
<body>
<div id="box1"></div>
<script>
window.onload=function(){
var mydiv=document.getElementById("box1");
mydiv.onmouseover=function(){
startMove(0.1,1);
}
mydiv.onmouseout=function(){
startMove(-0.1,0.3);
}
}
var myopacity=0.3;
function startMove(speed,mytarget){
clearInterval(i);
var mydiv=document.getElementById("box1");
var i=null;
i=setInterval(function(){
if(myopacity==mytarget){
clearInterval(i);
}
else {
mydiv.style.opacity=myopacity+speed;
}
},30)
} <!--end of startMove-->
</script>
</body>
</html>
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JavaScript