js操作元素透明度以及浏览器兼容性

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>透明度</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style>
    #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(){
            movestar(100);
        }
        oDiv.onmouseout=function(){
            movestar(30);
        }
    }
    var timer=null;
    var alpha=30;
    function movestar(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>
</head>
<body>
    <div id="div1"></div>
</body>
</html>
原文地址:https://www.cnblogs.com/itsmart/p/8047778.html