多图淡入淡出 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        div {
            width: 100px;
            height: 100px;
            background: red;
            margin: 10px;
            filter: alpha(30);
            opacity: 0.3;
        }
    </style>
    <script>
        window.onload = function() {
                var aDiv = document.getElementsByTagName('div');
                var i = 0;
                for (i = 0; i < aDiv.length; i++) {
                    aDiv[i].alpha = 30;
                    aDiv[i].onmouseover = function() {
                        startMove(this, 100);
                    }
                    aDiv[i].onmouseout = function() {
                        startMove(this, 30);
                    }
                }
            }
            // var alpha = 30;

        function startMove(obj, iTarget) { //多物体运动所有东西都不能共用
            clearInterval(obj.timer);
            obj.timer = setInterval(function() {
                var iSpeed = (iTarget - obj.alpha) / 8;
                iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
                if (obj.alpha == iTarget) {
                    clearInterval(obj.timer);
                } else {
                    obj.alpha += iSpeed;
                    obj.style.filter = 'alpha(opacity:' + obj.alpha + ')';
                    obj.style.opacity = obj.alpha / 100;
                }
            }, 30)
        }
    </script>
</head>

<body>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
</body>

</html>

 

查看范例

posted @ 2017-02-16 18:05  Mr_W_Blog  阅读(160)  评论(0)    收藏  举报