JS實(shí)現(xiàn)5秒鐘自動(dòng)封鎖div層的方法

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    這篇文章主要介紹了JS實(shí)現(xiàn)5秒鐘自動(dòng)封鎖div層的方法,涉及javascript針對(duì)div層操作的技巧,具有一定參考借鑒價(jià)值,需要的朋友可以參考下
    本文實(shí)例講述了JS實(shí)現(xiàn)5秒鐘自動(dòng)封鎖div層的方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下:
    代碼如下:
    <html>
    <head>
    <title>JS實(shí)現(xiàn)5秒鐘自動(dòng)封鎖div層</title>
    <style type="text/css">
    <!--
    #sponsorAdDiv {position:absolute; height:1; width:1; top:0; left:0;}
    -->
    </style>
    </head>
    <body>
    <SCRIPT LANGUAGE="JavaScript1.2">
    adTime=5; //封鎖窗口期待的時(shí)間
    chanceAd=1;
    var ns=(document.layers);
    var ie=(document.all);
    var w3=(document.getElementById && !ie);
    adCount=0;
    function initAd(){
    if(!ns && !ie && !w3) return;
    if(ie) adDiv=eval('document.all.sponsorAdDiv.style');
    else if(ns) adDiv=eval('document.layers["sponsorAdDiv"]');
    else if(w3) adDiv=eval('document.getElementById("sponsorAdDiv").style');
    randAd=Math.ceil(Math.random()*chanceAd);
    if (ie||w3)
    adDiv.visibility="visible";
    else
    adDiv.visibility ="show";
    if(randAd==1) showAd();
    }
    function showAd(){
    if(adCount<adTime*10){adCount+=1;
    if (ie){documentWidth =document.body.offsetWidth/2+document.body.scrollLeft-20;
    documentHeight =document.body.offsetHeight/2+document.body.scrollTop-20;}
    else if (ns){documentWidth=window.innerWidth/2+window.pageXOffset-20;
    documentHeight=window.innerHeight/2+window.pageYOffset-20;}
    else if (w3){documentWidth=self.innerWidth/2+window.pageXOffset-20;
    documentHeight=self.innerHeight/2+window.pageYOffset-20;}
    adDiv.left=documentWidth-200;adDiv.top =documentHeight-200;
    setTimeout("showAd()",100);}else closeAd();
    }
    function closeAd(){
    if (ie||w3)
    adDiv.display="none";
    else
    adDiv.visibility ="hide";
    }
    onload=initAd;
    </script>
    <div id="sponsorAdDiv">
    <table width="450" height="350" bgcolor="008000"><tr><td>
    <table width="445" height="345" bgcolor="F0FFF0"><tr><td>
    <center>welcome to >這個(gè)窗口將在5秒后自動(dòng)封鎖</center>
    </td></tr></table></td></tr></table></div>
    </body>
    </html>
    希望本文所述對(duì)大家的javascript程序設(shè)計(jì)有所幫助。