本文實例講述了JS實現網頁Div層Clone拖拽效果。分享給大家供大家參考。具體如下：
這是一個層拖動，網頁上的拖拽Clone效果實例，兩個層可在鼠標的拖動下，任意改變位置，智能判斷層級，也就是智能判斷自身是否處于最高層，最高處的層是不會被其它層遮擋的。
運行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-draw-box-clone-style-codes/
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>拖拽--Clone</title><style type="text/css"> body,div{margin:0;padding:0;}body{background:#3e3e3e;}div{position:absolute;width:100px;height:100px;cursor:move;border:1px solid #888;background:#000;}#drag1{top:100px;left:100px;}#drag2{top:100px;left:300px;}#temp{opacity:0.3;filter:alpha(opacity=30);}</style><script type="text/javascript"> var zIndex = 1;window.onload = function (){ var oDrag1 = document.getElementById("drag1"); var oDrag2 = document.getElementById("drag2"); drag(oDrag1); drag(oDrag2);};function drag(oDrag){ var disX = dixY = 0; oDrag.onmousedown = function (event) { var event = event || window.event; disX = event.clientX - this.offsetLeft; disY = event.clientY - this.offsetTop; var oTemp = document.createElement("div"); oTemp["id"] = "temp"; oTemp.style.left = this.currentStyle ? this.currentStyle["left"] : getComputedStyle(this, null)["left"]; oTemp.style.top = this.currentStyle ? this.currentStyle["top"] : getComputedStyle(this, null)["top"]; oTemp.style.zIndex = zIndex++; document.body.appendChild(oTemp); document.onmousemove = function (event) { var event = event || window.event; var iL = event.clientX - disX; var iT = event.clientY - disY; var maxL = document.documentElement.clientWidth - oDrag.offsetWidth; var maxT = document.documentElement.clientHeight - oDrag.offsetHeight iL <= 0 && (iL = 0); iT <= 0 && (iT = 0); iL >= maxL && (iL = maxL); iT >= maxT && (iT = maxT); oTemp.style.left = iL + "px"; oTemp.style.top = iT + "px"; return false; }; document.onmouseup = function () { document.onmousemove = null; document.onmouseup = null; oDrag.style.left = oTemp.style.left; oDrag.style.top = oTemp.style.top; oDrag.style.zIndex = oTemp.style.zIndex; document.body.removeChild(oTemp); oDrag.releaseCapture && oDrag.releaseCapture() }; this.setCapture && this.setCapture(); return false } }</script></head><body><div id="drag1"></div><div id="drag2"></div></body></html>希望本文所述對大家的JavaScript程序設計有所幫助。
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