鼠标移入移出透明度变化效果

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style style="text/css">
        *{
            margin:0;
            padding:0;
        }
        #div1{
            width:200px;
            height: 200px;
            background: red;
            filter:alpha(opacity:30); /* 兼容IE */
            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);//防止定时器叠加
        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>

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原文地址：https://www.cnblogs.com/clear93/p/5239380.html