用ajax实现的自动投票的代码_javascript技巧

<script> <BR>var CheckFreq=1;//队列检查频率，默认1秒检查一次 <BR>var bRun=false;//防止同一时间同时运行２个程序 <BR>function RunUrl(strUrl,strFreq) <BR>{ <BR> this.url=strUrl;//运行的URL <BR> this.freq=strFreq;//运行频率 <BR> this.lastrun='';//上次运行时间 <BR>} <BR>var RunQueue = new Array(); <BR>function AddRun(strUrl,strFreq)//添加Run <BR>{ <BR> if(strUrl==''||strFreq=='')return <BR> RunQueue[RunQueue.length]=new RunUrl(strUrl,strFreq) <BR>} <BR>function Run(url)//运行url <BR>{ <BR> var xmlHttp; <BR> if (window.XMLHttpRequest)xmlHttp = new XMLHttpRequest(); <BR> else if (window.ActiveXObject)xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); <BR> xmlHttp.onreadystatechange = function(){bRun=false;} <BR> xmlHttp.open("GET", url, true); <BR> xmlHttp.send(null); <BR> bRun=true; <BR>} <BR>function CheckRun()//检查队列 <BR>{ <BR> var dtNow=new Date(),objRun; <BR> var tNow=dtNow.getTime(); <BR> for(var i=0;i<RunQueue.length;i++) <BR> { <BR> objRun=RunQueue[i]; <BR> if(objRun.lastrun=='')objRun.lastrun=tNow; <BR> if(!bRun&&(objRun.freq==0||(tNow-objRun.lastrun)>objRun.freq*1000)) <BR> { <BR> objRun.lastrun=tNow; <BR> Run(objRun.url); <BR> } <BR> } <BR>} <BR>AddRun('http://publish.sina.com.cn/poll.php?p_id=413&t_id=119',10); <BR>setInterval('CheckRun()',CheckFreq*1000);//setInterval <BR></script>

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