<!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>无标题文档</title> <script src="file:///E|/课程视频/0103Jquery/Jquery/jquery-1.11.2.min.js"></script> <style type="text/css"> #zz{width:100%; height:100%; position:absolute; left:0px; top:0px; background-color:black; z-index:5;filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity: 0.5; opacity: 0.5;} </style> </head> <body> <div id="shang" style="position:absolute; z-index:10; left:100px; top:100px;"> <input type="button" value="关灯" id="guan" /> <input type="button" value="开灯" id="kai" /> </div> </body> <script type="text/javascript"> $("#guan").click(function(){ var str = "<div id='zz'></div>"; $("body").append(str); $(this).css("display","none"); $("#kai").css("display","block"); }) $("#kai").click(function(){ $("#zz").remove(); $("#guan").css("display","block"); $(this).css("display","none"); }) </script> </html>