js实现数字跳动到指定数字（小数、大数据都适用）

1、先上图

动画12.gif

2、技术代码（复制粘贴，直接使用）

/**
     * start:起始数据
     * end:最终数据
     * time:动画时间
    * */
jumpNumber(start, end, time) {
      this.num = start
      let endNum = end
      let lastNum = ''  //小数
      let digit = 0 //小数位数
      let step = 0  //累加步长
      const len = parseInt(end).toString().length
      //判断是小数
      if(parseInt(end) !== end) {
        endNum = parseInt(end)
        lastNum = end.toString().split('.')[1]
        digit = lastNum.length
      }
      const timer = setInterval(() => {
        if(this.num < (endNum - step)) {
          step++
          //小数
          let point = this.getRandomNum(digit)
          //数据过大，后面几位数随机跳动
          if(len >= 6) {
            let bigNumber = this.getRandomNum(len - 3)
            const leng = parseInt(start).toString().length
            const length = leng - bigNumber.length
            //截取岁随机数前面的数
            const cur = length <= 0 ? parseInt(start) : parseInt(start.toString().slice(0, length))
            start = cur + step + bigNumber + '.' + point
          } else {
            start = parseInt(start) + step + '.' + point
          }
          this.num = parseFloat(start)
        } else {
          clearInterval(timer)
          this.num = end
        }
    }, time)
},
getRandomNum(len) {
    let point = ''
    for(let i = 1; i <= len; i++) {
      point = point + parseInt(Math.random() * 10)
    }
    return point
  }

3、使用
this.jumpNumber(0, 128.456, 50)