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JS_CSS_logon_Mask

<!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" xml:lang="en" lang="en">       <head>              <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>              <title>test1</title>              <script>              function show(){                     var div=top.document.createElement("div");                     var divText=document.createTextNode("Saving");                     div.appendChild(divText);                     div.style.width=top.document.documentElement.scrollWidth+"px";                     div.style.height=top.document.documentElement.scrollHeight+"px";                     div.style.backgroundColor="gray";                     div.style.position="absolute";                     div.style.left=0;                     div.style.top=0;                     div.style.zIndex=9999;                     if(top.document.all)                        div.style.filter = "alpha(opacity=30)";                                              else div.style.opacity = .3;                     top.document.getElementById("ddd").appendChild(div);                     alert("真棒");              }              </script>       </head>       <body>       <div id="ddd">       <input type="button" value="http://www.mamicode.com/click" onclick="show()" />       </div>           </body></html>