转自：http://forlab.iteye.com/blog/1767843
<!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=gb2312" /> <title>Jquery遮罩层</title> <style type="text/css"> #BgDiv{background-color:#e3e3e3; position:absolute; z-index:99; left:0; top:0; display:none; width:100%; height:100%;opacity:0.5;filter: alpha(opacity=50);-moz-opacity: 0.5;} #DialogDiv{position:absolute;width:400px; left:50%; top:50%; margin-left:-200px; height:auto; z-index:100;background-color:#fff; border:1px #8FA4F5 solid; padding:1px;} #DialogDiv h2{ height:25px; font-size:14px; background-color:#8FA4F5; position:relative; padding-left:10px; line-height:25px;} #DialogDiv h2 a{position:absolute; right:5px; font-size:12px; color:#000000} #DialogDiv .form{padding:10px;} </style> <script language="javascript" type="text/javascript" src="jquery-1.4.2.min.js"></script> <script language="javascript" type="text/javascript"> function ShowDIV(thisObjID) { $("#BgDiv").css({ display: "block", height: $(document).height() }); $("#" + thisObjID ).css("top", "100px"); $("#" + thisObjID ).css("display", "block"); } function closeDiv(thisObjID) { $("#BgDiv").css("display", "none"); $("#" + thisObjID).css("display", "none"); } </script> </head> <body> <div> <input value="forlab" type="button" id="btnShow1" onclick="alert('forlab')" /> <div id="BgDiv"></div> <!--遮罩层显示的DIV1--> <div id="DialogDiv" style="display:none"> <h2>弹出层<a href="#" id="btnClose" onclick="javascript:closeDiv('DialogDiv')">关闭</a></h2> <div class="form">我是弹出对话框forlab！</div> </div> <p> <input value="弹出遮罩层1" type="button" id="btnShow1" onclick="ShowDIV('DialogDiv')" /> </p> <div> </body> </html>