数字变化动效

在开发过程中经常会遇到数字从0不断变动的动画效果，在接到这样的需求后，我第一时间想到了通过计时器的方式对数字进行不断的更改，以实现这样的变动效果。具体代码如下：

// 数字动效
    var numberAction = function (id, number) {
      this.id = id;
      this.number = number ? number : Number($(id).html());
    }

    numberAction.prototype.start = function () {
      // time单位为ms
      var _this = this, num = 0;
      this.flag = setInterval(function () {
        var the_int = _this.number.toFixed(0);
        var last = (_this.number - num);
        if (last > 100000) {
          num = Number(num) + 100000;
        } else if (last > 10000) {
          num = Number(num) + 10000;
        } else if (last > 1000) {
          num = Number(num) + 1000;
        } else if (last > 100) {
          num = Number(num) + 100;
        } else if (last > 10) {
          num = Number(num) + 10;
        } else if (last > 1) {
          num = Number(num) + 1;
        } else if (last <= 0) {
          console.log(num, _this.number)
          clearInterval(_this.flag);
        }
        $(_this.id).html(num)
      }, 80);
    }
//设置数字动效的id列表以便后面遍历创建numberAction动效
    var numberlist = ["#num-1", "#num-2", "#num-3", "#num-4", "#num-5", "#num-6", "#num-7", "#num-8", "#num-9"];
    for (var i = 0; i < numberlist.length; i++) {
      var number = new numberAction(numberlist[i]);
      number.start();
    }