js写一个弹出层并锁屏效果实现代码

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我是靠谱客的博主传统板凳，最近开发中收集的这篇文章主要介绍js写一个弹出层并锁屏效果实现代码，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

复制代码代码如下:

 
<!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>一个弹出层并锁屏效果</title> 
</head> 
<body> 
<div> 
<div> 
<p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p> 
<p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p><p>测试</p> 
<input type="button" value="点击这里" onClick="sAlert('测试弹出层并锁屏效果');" /> 
</div> 
</div> 
<script language="javascript"> 
function sAlert(str) 
{ 
var msgw,msgh,bordercolor; 
msgw=400;//提示窗口的宽度 
msgh=100;//提示窗口的高度 
titleheight=25 //提示窗口标题高度 
bordercolor="#336699";//提示窗口的边框颜色 
titlecolor="#99CCFF";//提示窗口的标题颜色 
var sWidth,sHeight; 
sWidth=document.body.offsetWidth;//获取窗口宽度 
sHeight=screen.height;//获取屏幕高度 
var bgObj=document.createElement("div");//关键在这里，原理：在body中创建一个div，并将其宽度与高度设置为覆盖整个窗体，如此一来就无法对其它窗口时行操作 
bgObj.setAttribute('id','bgDiv'); 
bgObj.style.position="absolute"; 
bgObj.style.top="0"; 
bgObj.style.background="#777"; 
bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75"; 
bgObj.style.opacity="0.6"; 
bgObj.style.left="0"; 
bgObj.style.width=sWidth + "px"; 
bgObj.style.height=sHeight + "px"; 
bgObj.style.zIndex = "10000"; 
document.body.appendChild(bgObj);//设置完此div后将其显示出来 
var msgObj=document.createElement('div');//创建一个消息窗口 
msgObj.setAttribute("id","msgDiv"); 
msgObj.setAttribute("align","center"); 
msgObj.style.background="white"; 
msgObj.style.border="1px solid " + bordercolor; 
msgObj.style.position = "absolute"; 
msgObj.style.left = "50%"; 
msgObj.style.top = "50%"; 
msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif"; 
msgObj.style.marginLeft = "-225px" ; 
msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px"; 
msgObj.style.width = msgw+"px"; 
msgObj.style.height = msgh+"px"; 
msgObj.style.textAlign = "center"; 
msgObj.style.lineHeight ="25px"; 
msgObj.style.zIndex = "10001"; 
var title=document.createElement("h4"); //创建一个标题，以备放置在消息层 
title.setAttribute("id","msgTitle"); 
title.setAttribute("align","right"); 
title.style.margin="0"; 
title.style.padding="3px"; 
title.style.background=bordercolor; 
title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);"; 
title.style.opacity="0.75"; 
title.style.border="1px solid " + bordercolor; 
title.style.height="18px"; 
title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif"; 
title.style.color="white"; 
title.style.cursor="pointer"; 
title.innerHTML="关闭"; 
title.onclick=function() 
{ 
document.body.removeChild(bgObj);//移除覆盖整个窗口的div层 
document.getElementById("msgDiv").removeChild(title);//移除标题 
document.body.removeChild(msgObj);//移除消息层 
} 
document.body.appendChild(msgObj); 
document.getElementById("msgDiv").appendChild(title); 
var txt=document.createElement("p"); 
txt.style.margin="1em 0" 
txt.setAttribute("id","msgTxt"); 
txt.innerHTML=str; 
document.getElementById("msgDiv").appendChild(txt); 
} 
</script> 
</body> 
</html> 