js纯数字逐一停止显示效果的实现代码

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);