小试动画透明度 

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        #div1 {
            width:200px;
            height:200px;
            background:red;
            filter:alpha(opacity:30);
            opacity:0.3;
        }
    </style>

    <script type="text/javascript">
        window.onload = function () {
            var oDiv = document.getElementById("div1");
            
            oDiv.onmousemove = function () {
                startMove(100);
            }

            oDiv.onmouseout = function () {
                startMove(30);
            }
        }
        
        var timer = null;

        var alpha = 30;

        function startMove(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;
                    //IE
                    oDiv.style.filter = 'alpha(opactiy :' + alpha + ')';
                   //google firefox
                    oDiv.style.opacity = alpha / 100;
                }
            }, 30);

        }
    </script>

</head>
<body>
    <div id="div1">

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

 

posted @ 2015-07-20 21:12  KyrieYang  阅读(197)  评论(0)    收藏  举报