用ajax实现的自动投票的代码javascript技巧_H5之家

<html>
<script language="javascript" >
var checkfreq=1;//队列检查频率，默认1秒检查一次
var brun=false;//防止同一时间同时运行２个程序
function runurl(strurl,strfreq)
{
  this.url=strurl;//运行的url
  this.freq=strfreq;//运行频率
  this.lastrun='';//上次运行时间
}
var runqueue = new array();
function addrun(strurl,strfreq)//添加run
{
  if(strurl==''||strfreq=='')return
  runqueue[runqueue.length]=new runurl(strurl,strfreq)
}
function run(url)//运行url
{
  var xmlhttp;
  if (window.xmlhttprequest)xmlhttp = new xmlhttprequest();
  else if (window.activexobject)xmlhttp = new activexobject("microsoft.xmlhttp");
  xmlhttp.onreadystatechange = function(){brun=false;}
  xmlhttp.open("get", url, true);
  xmlhttp.send(null);
  brun=true;
}
function checkrun()//检查队列
{
  var dtnow=new date(),objrun;
  var tnow=dtnow.gettime();
  for(var i=0;i<runqueue.length;i++)
  {
    objrun=runqueue[i];
    if(objrun.lastrun=='')objrun.lastrun=tnow;
    if(!brun&&(objrun.freq==0||(tnow-objrun.lastrun)>objrun.freq*1000))
    {
      objrun.lastrun=tnow;
      run(objrun.url);
    }
  }
}
addrun('http://publish.sina.com.cn/poll.php?p_id=413&t_id=119',10);
setinterval('checkrun()',checkfreq*1000);//setinterval
</script>

<script language="javascript" >

</script></html>