js实现图层拖拽特效实例，可回放拖动路径，并带有坐标显示功能，实用的图层拖动js特效代码。
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<title>图层完美拖拽轨迹移动js特效实例 武鸣人</title>
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<style type="text/css">
html,body{overflow:hidden;}
body,div,h2,p{margin:0;padding:0;}
body{color:#fff;background:#000;font:12px/2 Arial;}
p{padding:0 10px;margin-top:10px;}
span{color:#ff0;padding-left:5px;}
#box_www_wuming_ren{position:absolute;width:300px;height:150px;background:#333;border:2px solid #ccc;top:50%;left:150px;margin:-75px 0 0 -150px;}
#box_www_wuming_ren h2{height:25px;cursor:move;background:#222;border-bottom:2px solid #ccc;text-align:right;padding:0 10px;}
#box_www_wuming_ren h2 a{color:#fff;font:12px/25px Arial;text-decoration:none;outline:none;}
</style>
<script type="text/javascript">
window.onload=function ()
{//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
var oBox=document.getElementById("box_www_wuming_ren");
var oH2 = oBox.getElementsByTagName("h2")[0];
var oA = oBox.getElementsByTagName("a")[0];
var aSpan = oBox.getElementsByTagName("span");
var disX = disY = 0;
var bDrag = false;
var aPos = [{x:oBox.offsetLeft, y:oBox.offsetTop}]
//鼠标按下, 激活拖拽
oH2.onmousedown = function (event)
{
var event = event || window.event;
bDrag = true;
disX = event.clientX - oBox.offsetLeft;
disY = event.clientY - oBox.offsetTop;
aPos.push({x:oBox.offsetLeft, y:oBox.offsetTop})
this.setCapture && this.setCapture();
return false
};
//拖拽开始
document.onmousemove = function (event)
{
if (!bDrag) return;
var event = event || window.event;
var iL = event.clientX - disX;
var iT = event.clientY - disY;
var maxL = document.documentElement.clientWidth - oBox.offsetWidth;
var maxT = document.documentElement.clientHeight - oBox.offsetHeight;
iL = iL < 0 ? 0 : iL;
iL = iL > maxL ? maxL : iL;
iT = iT < 0 ? 0 : iT;
iT = iT > maxT ? maxT : iT;
oBox.style.marginTop = oBox.style.marginLeft = 0;
oBox.style.left = iL + "px";
oBox.style.top = iT + "px";
aPos.push({x:iL, y:iT})
status();
return false
};
//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
//鼠标释放, 结束拖拽
document.onmouseup = window.onblur = oH2.onlosecapture = function ()
{
bDrag = false;
oH2.releaseCapture && oH2.releaseCapture();
status()
};
//回放拖动轨迹
oA.onclick = function ()
{
if (aPos.length == 1) return;
var timer = setInterval(function ()
{
var oPos = aPos.pop();
oPos ? (oBox.style.left = oPos.x + "px", oBox.style.top = oPos.y + "px", status()) : clearInterval(timer)
}, 30);
this.focus = false;//去除链接虚线
return false
};
//阻止冒泡
oA.onmousedown = function (event)
{
(event || window.event).cancelBubble = true
};
//监听状态函数
function status ()
{
aSpan[0].innerHTML = bDrag;
aSpan[1].innerHTML = oBox.offsetTop;
aSpan[2].innerHTML = oBox.offsetLeft
}
//初始调用
status()
};//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
</script>
</head>
<body>
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<div id="box_www_wuming_ren">
<h2><a href="javascript:;">点击回放拖动轨迹</a></h2>
<p><strong>Drag:</strong><span></span></p>
<p><strong>offsetTop:</strong><span></span></p>
<p><strong>offsetLeft:</strong><span></span></p>
</div>
</body>
</html>