待完成：有时间搞一搞网页反爬的js代码

比如消除实验室考试的那个5分钟点一次的功能

<script language="JavaScript">
var secondsInit = 1;
var hdflag = 0;
var login_flag = "1";
var site_url = "";

function _fresh()
{
    secondsInit ++;
    var seconds = secondsInit;
    var result = '';
    if (seconds >= 3600)
    {
        var h = Math.floor(seconds / 3600);
        result += h + "小时";
        seconds -= 3600 * h;
    }
    if (seconds >= 60)
    {
        var m = Math.floor(seconds / 60);
        result += m + "分";
        seconds -= 60 * m;
    }
    result += seconds + "秒";
    document.getElementById('_lefttime').innerHTML = result;

    if((hdflag % 60)==0){
        $.post(site_url+"/exam_xuexi_online.php", {
            "cmd":'xuexi_online'
        }, function (data) {
            data = eval('('+data+')');
            if(data.status==1){
                $('#xuexi_online').html(data.shichang);
            }
        });
    }
    if(hdflag>240){
            hdflag = 0; 
    }
    hdflag ++;
}
if(login_flag){
    _fresh()
    setInterval(_fresh,1000);
}
</script>

改之前if判断那块本来是：
if(hdflag > 300){
  if(....()){
     输出......
  }
}