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js寫一個彈出層并鎖屏效果實現(xiàn)代碼

更新時間：2012年12月07日 15:30:11 作者：

js實現(xiàn)一個彈出層并鎖屏效果是每一網(wǎng)友所期望的效果，于是搜集整理一番，把代碼曬出來和大家分享

 
<!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>一個彈出層并鎖屏效果</title> 
</head> 
<body> 
<div> 
<div> 
<p>測試</p><p>測試</p><p>測試</p><p>測試</p><p>測試</p><p>測試</p><p>測試</p> 
<p>測試</p><p>測試</p><p>測試</p><p>測試</p><p>測試</p><p>測試</p><p>測試</p> 
<input type="button" value="點擊這里" onClick="sAlert('測試彈出層并鎖屏效果');" /> 
</div> 
</div> 
<script language="javascript"> 
function sAlert(str) 
{ 
var msgw,msgh,bordercolor; 
msgw=400;//提示窗口的寬度 
msgh=100;//提示窗口的高度 
titleheight=25 //提示窗口標(biāo)題高度 
bordercolor="#336699";//提示窗口的邊框顏色 
titlecolor="#99CCFF";//提示窗口的標(biāo)題顏色 
var sWidth,sHeight; 
sWidth=document.body.offsetWidth;//獲取窗口寬度 
sHeight=screen.height;//獲取屏幕高度 
var bgObj=document.createElement("div");//關(guān)鍵在這里，原理：在body中創(chuàng)建一個div，并將其寬度與高度設(shè)置為覆蓋整個窗體，如此一來就無法對其它窗口時行操作 
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);//設(shè)置完此div后將其顯示出來 
var msgObj=document.createElement('div');//創(chuàng)建一個消息窗口 
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"); //創(chuàng)建一個標(biāo)題，以備放置在消息層 
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="關(guān)閉"; 
title.onclick=function() 
{ 
document.body.removeChild(bgObj);//移除覆蓋整個窗口的div層 
document.getElementById("msgDiv").removeChild(title);//移除標(biāo)題 
document.body.removeChild(msgObj);//移除消息層 
} 
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> 