var len = String(num).length;

    var temnum,times = 0,stepTimes,max ;
    var numArr = String(num).split("");


    function getRandom(n){
      var num = Math.floor(Math.random()*(Math.pow(10,n)-1 - Math.pow(10,n-1))+Math.pow(10,n-1));

      if (String(num).length !== n) {num = getRandom(n);}

      return num;
    }

    function setValue(num,pause,secand){//second 运行多少秒后停止
      var len = String(num).length,j=0;

      if (!stepTimes) {
        max = Math.ceil(secand*1000/len);
        stepTimes = Math.ceil(max/pause);
      }

      temnum = "";
      setTimeout(function(){
        for (var i = 1; i <= len; i++) {
          if (times >= stepTimes*i) {
            j++;
            temnum += numArr[i-1]+"";
          }else{
            break;
          }
        };

        if (j < len) {
          $ele.html(temnum+""+getRandom(len-j));
        }else{
          $ele.html(temnum);
        }


        if (times >= max || j >= len) {return;};

        setValue(num,secand);
        times++;

      },pause);


    }

    setValue(num,secand);

  }

showscore($(".num"),2344,1.5,10);