运行效果截图如下：
具体代码如下：
<!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>无标题文档</title> <script type="text/javascript" src="https://www.jb51.net/jquery1.3.2.js"></script> <style type="text/css"> <!-- html, body { height: 100%; margin: 0px; font-size: 12px; } .mydiv { background-color: #FFCC66; border: 1px solid #f00; text-align: center; line-height: 40px; font-size: 12px; font-weight: bold; z-index: 99; width: 300px; height: 120px; left: 50%; /*FF IE7*/ top: 50%; /*FF IE7*/ margin-left: -150px !important; /*FF IE7 该值为本身宽的一半 */ margin-top: -60px !important; /*FF IE7 该值为本身高的一半*/ margin-top: 0px; position: fixed !important; /*FF IE7*/ position: absolute; /*IE6*/ _top: expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/ document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2); /*IE5 IE5.5*/ } .mydiv2 { background-color: #FFCC66; border: 1px solid #f00; text-align: center; line-height: 40px; font-size: 12px; font-weight: bold; z-index: 99; width: 400px; height: 400px; left: 50%; /*FF IE7*/ top: 50%; /*FF IE7*/ margin-left: -200px !important; /*FF IE7 该值为本身宽的一半 */ margin-top: -200px !important; /*FF IE7 该值为本身高的一半*/ margin-top: 0px; position: fixed !important; /*FF IE7*/ position: absolute; /*IE6*/ _top: expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/ document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2); /*IE5 IE5.5*/ } .bg { background-color: #666; width: 100%; height: 100%; left: 0; top: 0; /*FF IE7*/ filter: alpha(opacity=50); /*IE*/ opacity: 0.5; /*FF*/ z-index: 1; position: fixed !important; /*FF IE7*/ position: absolute; /*IE6*/ _top: expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/ document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2); /*IE5 IE5.5*/ } -- ></style> <script language="javascript" type="text/javascript"> function showDiv() { $('#popDiv').removeClass().addClass("mydiv").css("display","block").css("background","ff9"); $('#bg').css("display","block"); } function showDiv2() { $('#popDiv').removeClass().addClass("mydiv2").css("display","block").css("background","pink"); $('#bg').css("display","block"); } function closeDiv() { $('#popDiv').css("display","none"); $('#bg').css("display","none"); } </script> </head> <body> <div> 动态弹出的层<br /> 动态弹层的内容<br /> <a href="javascript:closeDiv()">关闭窗口</a></div> <div> </div> <div> <div> <a href="javascript:showDiv()">点我1</a><br/><br/> <a href="javascript:showDiv2()">点我2</a> </div> </div> </body> </html>