側邊欄層滾動緩衝運動,側邊欄滾動緩衝

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側邊欄層滾動緩衝運動,側邊欄滾動緩衝

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html xmlns="http://www.w3.org/1999/xhtml">    <head>        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />        <title>側邊滾動運動</title>        <style type="text/css">#div1 {width: 100px;height: 100px;position: absolute;background: green;right: 0px;}body {height: 1000px;}        </style>    </head>    <script  type="text/javascript">        window.onload = function() {            document.onscroll = function() {                var oDiv1 = document.getElementById("div1");                var iScrollTop = document.documentElement.scrollTop || document.body.scrollTop;                var iClientHeight = document.documentElement.clientHeight || document.body.clientHeight;                var i = iScrollTop + (iClientHeight - oDiv1.offsetHeight) / 2;                //oDiv1.style.top = iScrollTop + (iClientHeight - oDiv1.offsetHeight) / 2 + "px";                // oDiv1.innerHTML = iScrollTop + (iClientHeight - oDiv1.offsetHeight) / 2 + "px";                startMove(oDiv1, parseInt(i));//paserInt是防止抖動,目標點取整            };            var oTimer = null;            function startMove(obj, iTarget) {                clearInterval(oTimer);                oTimer = setInterval(function() {                      //速度                    var iSpeed = (iTarget - obj.offsetTop) /8;                    iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);                    //速度取整                    if (obj.offsetTop == iTarget) {                        clearInterval(oTimer);                    } else {                        obj.style.top = obj.offsetTop + iSpeed + "px";//層運動                    };                }, 30);            };        };    </script>    <body>        <div id="div1">        </div>    </body></html>

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