js遮罩层效果代码一例

发布时间:2020-11-10编辑:脚本学堂
本文介绍下,js实现的遮罩层效果的例子,有需要的朋友,参考下吧。

js遮罩层效果代码。

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=utf-8" />
 <title>mask遮罩层-www.jb200.com</title>
 <style type="text/css">
   #newDiv
   {
   
   }
 </style>
</head>
<body>
<script type="text/javascript">
  var docEle = function() {
   return document.getElementById(arguments[0]) || false;
  }

  function openNewDiv(_id) {
   var m = "mask";
   if (docEle(_id)) document.body.removeChild(docEle(_id));
   if (docEle(m)) document.body.removeChild(docEle(m));

   //mask遮罩层
   var newMask = document.createElement("div");
   newMask.id = m;
   newMask.style.position = "absolute";
   newMask.style.zIndex = "1";
   _scrollWidth = Math.max(document.body.scrollWidth, document.documentElement.scrollWidth);
   _scrollHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
   newMask.style.width = _scrollWidth + "px";
   newMask.style.height = _scrollHeight + "px";
   newMask.style.top = "0px";
   newMask.style.left = "0px";
   newMask.style.background = "#33393C";
   newMask.style.filter = "alpha(opacity=10)";
   newMask.style.opacity = "0.20";
   document.body.appendChild(newMask);

   //新弹出层
   var newDiv = document.createElement("div");
   newDiv.id = _id;
   newDiv.style.position = "absolute";
   newDiv.style.zIndex = "9999";
   newDivWidth = 400;
   newDivHeight = 200;
   newDiv.style.width = newDivWidth + "px";
   newDiv.style.height = newDivHeight + "px";
   newDiv.style.top = (document.body.scrollTop + document.body.clientHeight / 2 - newDivHeight / 2) + "px";
   newDiv.style.left = (document.body.scrollLeft + document.body.clientWidth / 2 - newDivWidth / 2) + "px";
   newDiv.style.background = "#EFEFEF";
   newDiv.style.border = "1px solid #860001";
   newDiv.style.padding = "5px";
   newDiv.innerHTML = "弹出层内容 ";
   document.body.appendChild(newDiv);

   //弹出层滚动居中

   function newDivCenter() {
    newDiv.style.top = (document.body.scrollTop + document.body.clientHeight / 2 - newDivHeight / 2) + "px";
    newDiv.style.left = (document.body.scrollLeft + document.body.clientWidth / 2 - newDivWidth / 2) + "px";
   }
   if (document.all) {
    window.attachEvent("onscroll", newDivCenter);
   }
   else {
    window.addEventListener('scroll', newDivCenter, false);
   }

   //关闭新图层和mask遮罩层

   var newA = document.createElement("a");
   newA.href = "#";
   newA.innerHTML = "关闭";
   newA.onclick = function() {
    if (document.all) {
     window.detachEvent("onscroll", newDivCenter);
    }
    else {
     window.removeEventListener('scroll', newDivCenter, false);
    }
    document.body.removeChild(docEle(_id));
    document.body.removeChild(docEle(m));
    return false;
   }
   newDiv.appendChild(newA);
  }
 </script>
 <body>
  <a  style="cursor: pointer">点击弹出遮罩层</a>
  <br />
  <br />
  <br />
  <br />
  <br />
  <br />
  <br />
  <br />
  <br />
  <br />
 </body>
 <script type="text/javascript">
  openNewDiv('newDiv');
 </script>
</html>