像这样的HTML淘宝倒计时，不用手动输入时间，谁会做，急急急

这个需要js设置时间的，我给你一个我以前做的倒计时吧，希望有用：

function _fresh()
{
 var endtime=new Date("2016/9/01,00:00:00");
 var nowtime = new Date();
 var leftsecond=parseInt((endtime.getTime()-nowtime.getTime())/1000);
 __d=parseInt(leftsecond/3600/24);
var c=new Date();
var q=((c.getMilliseconds())%10);
 document.getElementById("timeaa").innerHTML=__d;
 if(leftsecond<=0){
 document.getElementById("timeaa").innerHTML="";
 clearInterval(sh);
 }
}
_fresh()
var sh;
sh=setInterval(_fresh,100);




function _fresh()
{
 var endtime=new Date("2016/9/01,00:00:00");
 var nowtime = new Date();
 var leftsecond=parseInt((endtime.getTime()-nowtime.getTime())/1000);
 __h=parseInt((leftsecond/3600)%24);
var c=new Date();
var q=((c.getMilliseconds())%10);
 document.getElementById("timebb").innerHTML=__h;
 if(leftsecond<=0){
 document.getElementById("timebb").innerHTML="活动已结束";
 clearInterval(sh);
 }
}
_fresh()
var sh;
sh=setInterval(_fresh,100);




function _fresh()
{
 var endtime=new Date("2016/9/01,00:00:00");
 var nowtime = new Date();
 var leftsecond=parseInt((endtime.getTime()-nowtime.getTime())/1000);
 __m=parseInt((leftsecond/60)%60);
var c=new Date();
var q=((c.getMilliseconds())%10);
 document.getElementById("timecc").innerHTML=__m;
 if(leftsecond<=0){
 document.getElementById("timecc").innerHTML="活动已结束";
 clearInterval(sh);
 }
}
_fresh()
var sh;
sh=setInterval(_fresh,100);




function _fresh()
{
 var endtime=new Date("2016/9/01,00:00:00");
 var nowtime = new Date();
 var leftsecond=parseInt((endtime.getTime()-nowtime.getTime())/1000);
 __s=parseInt(leftsecond%60);
var c=new Date();
var q=((c.getMilliseconds())%10);
 document.getElementById("timedd").innerHTML=__s+"."+q;
 if(leftsecond<=0){
 document.getElementById("timedd").innerHTML="活动已结束";
 clearInterval(sh);
 }
}
_fresh()
var sh;
sh=setInterval(_fresh,100);