function showScore($ele, num, secand, pause){ //second 按照秒数，动画运行多少秒
        if (!secand) { secand = 2;}
        if (!pause) { pause = 20;}

        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, pause, secand);
            times++;
            
          }, pause);


        }

        setValue(num, pause, secand);

      }

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