javascript實現漂亮的拖動層，窗口拖拽特效
<!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>窗口拖拽（改變大小/最小化/最大化/還原/關閉）</title><style type="text/css"> body,div,h2{margin:0;padding:0;}body{background:url(/jscss/demoimg/201205/bg.jpg);font:12px/1.5 /5fae/8f6f/96c5/9ed1;color:#333;}#drag{position:absolute;top:100px;left:100px;width:300px;height:160px;background:#e9e9e9;border:1px solid #444;border-radius:5px;box-shadow:0 1px 3px 2px #666;}#drag .title{position:relative;height:27px;margin:5px;}#drag .title h2{font-size:14px;height:27px;line-height:24px;border-bottom:1px solid #A1B4B0;}#drag .title div{position:absolute;height:19px;top:2px;right:0;}#drag .title a,a.open{float:left;width:21px;height:19px;display:block;margin-left:5px;background:url(/jscss/demoimg/201205/tool.png) no-repeat;}a.open{position:absolute;top:10px;left:50%;margin-left:-10px;background-position:0 0;}a.open:hover{background-position:0 -29px;}#drag .title a.min{background-position:-29px 0;}#drag .title a.min:hover{background-position:-29px -29px;}#drag .title a.max{background-position:-60px 0;}#drag .title a.max:hover{background-position:-60px -29px;}#drag .title a.revert{background-position:-149px 0;display:none;}#drag .title a.revert:hover{background-position:-149px -29px;}#drag .title a.close{background-position:-89px 0;}#drag .title a.close:hover{background-position:-89px -29px;}#drag .content{overflow:auto;margin:0 5px;}#drag .resizeBR{position:absolute;width:14px;height:14px;right:0;bottom:0;overflow:hidden;cursor:nw-resize;background:url(/jscss/demoimg/201205/resize.png) no-repeat;}#drag .resizeL,#drag .resizeT,#drag .resizeR,#drag .resizeB,#drag .resizeLT,#drag .resizeTR,#drag .resizeLB{position:absolute;background:#000;overflow:hidden;opacity:0;filter:alpha(opacity=0);}#drag .resizeL,#drag .resizeR{top:0;width:5px;height:100%;cursor:w-resize;}#drag .resizeR{right:0;}#drag .resizeT,#drag .resizeB{width:100%;height:5px;cursor:n-resize;}#drag .resizeT{top:0;}#drag .resizeB{bottom:0;}#drag .resizeLT,#drag .resizeTR,#drag .resizeLB{width:8px;height:8px;background:#FF0;}#drag .resizeLT{top:0;left:0;cursor:nw-resize;}#drag .resizeTR{top:0;right:0;cursor:ne-resize;}#drag .resizeLB{left:0;bottom:0;cursor:ne-resize;}</style><script type="text/javascript"> /*-------------------------- +獲取id, class, tagName+-------------------------- */var get = {byId: function(id) {return typeof id === "string" ? document.getElementById(id) : id},byClass: function(sClass, oParent) {var aClass = [];var reClass = new RegExp("(^| )" + sClass + "( |$)");var aElem = this.byTagName("*", oParent);for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);return aClass},byTagName: function(elem, obj) {return (obj || document).getElementsByTagName(elem)}};var dragMinWidth = 250;var dragMinHeight = 124;/*-------------------------- +拖拽函數+-------------------------- */function drag(oDrag, handle){var disX = dixY = 0;var oMin = get.byClass("min", oDrag)[0];var oMax = get.byClass("max", oDrag)[0];var oRevert = get.byClass("revert", oDrag)[0];var oClose = get.byClass("close", oDrag)[0];handle = handle || oDrag;handle.style.cursor = "move";handle.onmousedown = function (event){var event = event || window.event;disX = event.clientX - oDrag.offsetLeft;disY = event.clientY - oDrag.offsetTop;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);oDrag.style.left = iL + "px";oDrag.style.top = iT + "px";return false};document.onmouseup = function (){document.onmousemove = null;document.onmouseup = null;this.releaseCapture && this.releaseCapture()};this.setCapture && this.setCapture();return false}; //最大化按鈕oMax.onclick = function (){oDrag.style.top = oDrag.style.left = 0;oDrag.style.width = document.documentElement.clientWidth - 2 + "px";oDrag.style.height = document.documentElement.clientHeight - 2 + "px";this.style.display = "none";oRevert.style.display = "block";};//還原按鈕oRevert.onclick = function (){ oDrag.style.width = dragMinWidth + "px";oDrag.style.height = dragMinHeight + "px";oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";this.style.display = "none";oMax.style.display = "block";};//最小化按鈕oMin.onclick = oClose.onclick = function (){oDrag.style.display = "none";var oA = document.createElement("a");oA.className = "open";oA.href = "javascript:;";oA.title = "還原";document.body.appendChild(oA);oA.onclick = function (){oDrag.style.display = "block";document.body.removeChild(this);this.onclick = null;};};//阻止冒泡oMin.onmousedown = oMax.onmousedown = oClose.onmousedown = function (event){this.onfocus = function () {this.blur()};(event || window.event).cancelBubble = true};}/*-------------------------- +改變大小函數+-------------------------- */function resize(oParent, handle, isLeft, isTop, lockX, lockY){handle.onmousedown = function (event){var event = event || window.event;var disX = event.clientX - handle.offsetLeft;var disY = event.clientY - handle.offsetTop;var iParentTop = oParent.offsetTop;var iParentLeft = oParent.offsetLeft;var iParentWidth = oParent.offsetWidth;var iParentHeight = oParent.offsetHeight;document.onmousemove = function (event){var event = event || window.event;var iL = event.clientX - disX;var iT = event.clientY - disY;var maxW = document.documentElement.clientWidth - oParent.offsetLeft - 2;var maxH = document.documentElement.clientHeight - oParent.offsetTop - 2;var iW = isLeft ? iParentWidth - iL :handle.offsetWidth + iL;var iH = isTop ? iParentHeight - iT : handle.offsetHeight + iT;isLeft && (oParent.style.left = iParentLeft + iL + "px");isTop && (oParent.style.top = iParentTop + iT + "px");iW < dragMinWidth && (iW = dragMinWidth);iW > maxW && (iW = maxW);lockX || (oParent.style.width = iW + "px");iH < dragMinHeight && (iH = dragMinHeight);iH > maxH && (iH = maxH);lockY || (oParent.style.height = iH + "px");if((isLeft && iW == dragMinWidth) || (isTop && iH == dragMinHeight)) document.onmousemove = null;return false; };document.onmouseup = function (){document.onmousemove = null;document.onmouseup = null;};return false;}};window.onload = window.onresize = function (){var oDrag = document.getElementById("drag");var oTitle = get.byClass("title", oDrag)[0];var oL = get.byClass("resizeL", oDrag)[0];var oT = get.byClass("resizeT", oDrag)[0];var oR = get.byClass("resizeR", oDrag)[0];var oB = get.byClass("resizeB", oDrag)[0];var oLT = get.byClass("resizeLT", oDrag)[0];var oTR = get.byClass("resizeTR", oDrag)[0];var oBR = get.byClass("resizeBR", oDrag)[0];var oLB = get.byClass("resizeLB", oDrag)[0];drag(oDrag, oTitle);//四角resize(oDrag, oLT, true, true, false, false);resize(oDrag, oTR, false, true, false, false);resize(oDrag, oBR, false, false, false, false);resize(oDrag, oLB, true, false, false, false);//四邊resize(oDrag, oL, true, false, false, true);resize(oDrag, oT, false, true, true, false);resize(oDrag, oR, false, false, false, true);resize(oDrag, oB, false, false, true, false);oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";}</script></head><body><div id="drag"><div class="title"><h2>這是一個可以拖動的窗口</h2><div><a class="min" href="javascript:;" title="最小化"></a><a class="max" href="javascript:;" title="最大化"></a><a class="revert" href="javascript:;" title="還原"></a><a class="close" href="javascript:;" title="關閉"></a></div></div><div class="resizeL"></div><div class="resizeT"></div><div class="resizeR"></div><div class="resizeB"></div><div class="resizeLT"></div><div class="resizeTR"></div><div class="resizeBR"></div><div class="resizeLB"></div><div class="content">① 窗口可以拖動；<br />② 窗口可以通過八個方向改變大??；<br />③ 窗口可以最小化、最大化、還原、關閉；<br />④ 限制窗口最小寬度/高度。</div> </div></body></html>以上所述就是本文的全部內容了，希望大家能夠喜歡。
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