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JS+CSS Implementation Mask Center pop-up layer

Source: Internet
Author: User
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  This article describes the use of JS to implement the mask pop-up layer centered, and with the browser window scroll scroll, sample code as follows, interested friends can refer to the following

JS+CSS Implementation Mask Center pop-up layer (scrolling with browser window scroll bar)     code as follows: <!doctype html>  <head>  <meta charset= " Utf-8 "/>  <title></title>  <style type=" Text/css ">  *{}{margin:0;padding:0;}   Html{}{_background:url (About:blank);}/**//* prevent flashing in IE6, replace empty files with About:blank, reduce requests */  Body{}{background: #ff F font:12px/1.5 Tahoma,geneva, 5b8b4f53, Sans-serif; height:100%;}   wrap{}{height:980px; padding-top:20px;text-align:center;}   P{}{FONT-SIZE:14PX;TEXT-ALIGN:CENTER;LINE-HEIGHT:24PX;}  /**//** Mask layer **/  #masklayer {}{  background: #000;  display:none;  filter:alpha (opacity = 50);   opacity:0.5;  top:0;  left:0;  height:100%;  width:100%;  z-index:999;  position :fixed;  _position:absolute;  _left:expression (documentelement.scrollleft + documentElement.clientWidth- This.offsetwidth);  _top:expression (Documentelement.scrolltop + Documentelement.clientheight-thiS.offsetheight); } /**//** pop-up **/  #popup {}{  display:none;  width:300px;  z-index :1000;  left:50%;  top:50%;  position:fixed!important;  margin-left:-150px!important;  _ position:absolute;  _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*/ } . Content{}{background: #f3f3f3; border:1px solid #999;}   content h3{}{background: #a0a0a0; color: #fff; font-size:14px;height:32px;line-height:32px; padding-left:5px;}   #clickbtn {}{margin-top:20px;}   </style>  </head>  <body>  <div class= "wrap" >  <p>  I am the text I am the text I am the text I am the text I am the body I am the text I am the text   <br/>  I am the text I am the text I am the body I am the text I am the text I am the text I am the text   <br/>  I am the textI am the text I am the text I am the body I am the text I am the text   <br/>  I am the text I am the text I am the text I am the text I am the body of the text I am the text   <br/>  I am the text I am the text I am the text I am the text I am the text I am the text   </p>  <input type= "button" id= "clickbtn" value= "Clike Me"/>   </div>  <div id= "Masklayer" ></div>  <div id= "popup" >  <div class= " Content ">  <h3> am I a pop-up layer with no center? </h3>  <p> Center Center Center Center Center </p>  <p> Center Centered Center Center </p>  <p> Center Centered Center Center < /p>  <p> Center Center </p>  </div>  </div>  <script type= "Text/javascript ">  (function (masklayer) {  var clickbtn = document.getElementById (' clickbtn ');  Clickbtn.onclick = function () {  var popup = document.getElementById (' popup ');  masklayer.style.display= ' block ';  Popup.style.display = ' block ';  var h = popup.clientheight;  with (popup.style) {  margintop =-h/2+ ' px '; nbsp } } }) (document.getElementById (' Masklayer')   </script>  </body>    </html>     

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