首先給大家展示演示效果：
基于JavaScript的網頁彈出層，鼠標按在彈出層的標題欄處，可以拖動該浮動層隨意移動位置，不需要時也可以關閉，操作體驗舒服，兼容性好，IE/火狐等眾多瀏覽器下運行穩定、反應快速。代碼表現方面，簡潔務實，不玩虛的，拿去學習也相當不錯。
js代碼
示例一：
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><title>彈出層并可拖拽</title><style>html,body{height:100%;overflow:hidden;}body,div,h2{margin:0;padding:0;}body{font:12px/1.5 Tahoma;}li{ list-style-type:none}center{padding-top:10px;}button{cursor:pointer;}#overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#000;opacity:0.5;filter:alpha(opacity=50);display:none;}#win{position:absolute;top:50%;left:50%;width:400px;height:200px;background:#fff;border:4px solid #f90;margin:-102px 0 0 -202px;display:none;}h2{font-size:12px;height:18px;text-align:right;background:#FC0;border-bottom:3px solid #f90;padding:5px;cursor:move;}h2 span{color:#f90;cursor:pointer;background:#fff;border:1px solid #f90;padding:0 2px;}</style><script>window.onload = function (){var oWin = document.getElementById("win");var oLay = document.getElementById("overlay");var oBtn = document.getElementsByTagName("button")[0];var oClose = document.getElementById("close");var oH2 = oWin.getElementsByTagName("h2")[0];var bDrag = false;var disX = disY = 0;oBtn.onclick = function (){oLay.style.display = "block";oWin.style.display = "block"};oClose.onclick = function (){oLay.style.display = "none";oWin.style.display = "none"};oClose.onmousedown = function (event){(event || window.event).cancelBubble = true;};oH2.onmousedown = function (event){var event = event || window.event;bDrag = true;disX = event.clientX - oWin.offsetLeft;disY = event.clientY - oWin.offsetTop;this.setCapture && this.setCapture();return false};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 - oWin.offsetWidth;var maxT = document.documentElement.clientHeight - oWin.offsetHeight;iL = iL < 0 ? 0 : iL;iL = iL > maxL ? maxL : iL;iT = iT < 0 ? 0 : iT;iT = iT > maxT ? maxT : iT;oWin.style.marginTop = oWin.style.marginLeft = 0;oWin.style.left = iL + "px";oWin.style.top = iT + "px";return false};document.onmouseup = window.onblur = oH2.onlosecapture = function (){bDrag = false;oH2.releaseCapture && oH2.releaseCapture();};};</script><meta charset="utf-8"></head><body><div id="overlay"></div><div id="win"><h2><span id="close">×</span></h2><li><a target='_blank'>http://www.100sucai.com</a></li><li><a title="CSS3和Html5">CSS3和Html5</a></li><li><a title="圖表與圖形">圖表與圖形</a></li></div><center><button>彈出層</button></center></body></html><br />jq代碼：
代碼示例二：
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><title>jQuery彈出層效果</title><meta content="網頁特效,特效代碼,jQuery,css特效,Js代碼,廣告幻燈,圖片切換" name="keywords" /><meta content="jQuery彈出層效果，有關閉按鈕，代碼簡單易懂，你可以隨意修改彈出層的參數。" name="description" /><script src="/uploads/common/js/jquery-1.4.2.min.js" type="text/javascript"></script><style>.black_overlay{display: none;position: absolute;top: 0%;left: 0%;width: 100%;height: 100%;background-color: black;z-index:1001;-moz-opacity: 0.8;opacity:.80;filter: alpha(opacity=80);}.white_content {display: none;position: absolute;top: 10%;left: 10%;width: 80%;height: 80%;border: 16px solid lightblue;background-color: white;z-index:1002;overflow: auto;}.white_content_small {display: none;position: absolute;top: 20%;left: 30%;width: 40%;height: 50%;border: 16px solid lightblue;background-color: white;z-index:1002;overflow: auto;}</style><script type="text/javascript">//彈出隱藏層function ShowDiv(show_div,bg_div){document.getElementById(show_div).style.display='block';document.getElementById(bg_div).style.display='block' ;var bgdiv = document.getElementById(bg_div);bgdiv.style.width = document.body.scrollWidth;// bgdiv.style.height = $(document).height();$("#"+bg_div).height($(document).height());};//關閉彈出層function CloseDiv(show_div,bg_div){document.getElementById(show_div).style.display='none';document.getElementById(bg_div).style.display='none';};</script></head><body><input id="Button1" type="button" value="點擊彈出層" onclick="ShowDiv('MyDiv','fade')" /><!--彈出層時背景層DIV--><div id="fade" class="black_overlay"></div><div id="MyDiv" class="white_content"><div style="text-align: right; cursor: default; height: 40px;"><span style="font-size: 16px;" onclick="CloseDiv('MyDiv','fade')">關閉</span></div>目前來說，我還是喜歡這個自己改造的彈出層。自己在項目中也用的是這個。</div></body></html>以上通過jq和js分別實現了遮罩層點擊按鈕彈出并且具有拖動和關閉效果，希望對大家有所幫助。
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