首先给大家展示演示效果：
基于JavaScript的网页弹出层，鼠标按在弹出层的标题栏处，可以拖动该浮动层随意移动位置，不需要时也可以关闭，操作体验舒服，兼容性好，IE/火狐等众多浏览器下运行稳定、反应快速。代码表现方面，简洁务实，不玩虚的，拿去学习也相当不错。
js代码
示例一：
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>弹出层并可拖拽</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 href='http://www.100sucai.com' target='_blank'>http://www.100sucai.com</a></li> <li><a href="http://www.100sucai.com/web/jquerytexiao/CSS3heHtml5" title="CSS3和Html5">CSS3和Html5</a></li> <li><a href="http://www.100sucai.com/web/jquerytexiao/tubiaoyutuxing" title="图表与图形">图表与图形</a></li> </div> <center><button>弹出层</button></center> </body> </html><br />
jq代码：
代码示例二：
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>jQuery弹出层效果</title> <meta content="网页特效,特效代码,jQuery,css特效,Js代码,广告幻灯,图片切换" name="keywords" /> <meta content="jQuery弹出层效果，有关闭按钮，代码简单易懂，你可以随意修改弹出层的参数。" name="description" /> <script src="http://www.jb51.netuploads/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"> //弹出隐藏层 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()); }; //关闭弹出层 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="点击弹出层" /> <> <div id="fade"> </div> <div id="MyDiv"> <div> <span>关闭</span> </div> 目前来说，我还是喜欢这个自己改造的弹出层。自己在项目中也用的是这个。 </div> </body> </html>
以上通过jq和js分别实现了遮罩层点击按钮弹出并且具有拖动和关闭效果，希望对大家有所帮助。