setInterval更新的数据不能够及时的在页面做更新显示，但angular自带的$interval可以做到，用法和setInterval完全一样，这里只做了秒倒计时，没有做分钟倒计时，另外timer对象为全局变量，在点击按钮和切换路由的时候需要控制清楚timer,因为angular单页面web应用的特性。

leftTimer = $interval(function(){
    each.leftMsec = each.leftMsec-10;
    var time = (each.leftMsec).toString();
    each.Sec = time.substring(time.length-5,time.length-3);
    each.MSec = time.substring(time.length-3,time.length-1);
    console.log(each.Sec);
    //console.log(each.MSec);
    if(each.Sec.length==1){
        each.Sec = "0" + each.Sec;
    }else if(each.Sec==""){
        each.Sec = "00";
    }
    if(each.MSec.length==1){
        each.MSec = "0" + each.MSec;
    }else if(each.MSec==""){
        each.MSec = "00";
    }
    each.leftMsecS = ("00:"+each.Sec+":"+each.MSec)
    if(each.leftMsec<=0){
        each.leftMsecS = '正在揭晓......';
        $interval.cancel(leftTimer);

    }
},10);