vue 大屏数字上下滚动

效果就是有数字变动时，会有一个动画跳到相应的数字，是上下滚动的那种.

<div class="chartNum">
      <div class="box-item">
        <li :class="{'number-item': !isNaN(item), 'mark-item': isNaN(item) }"
            v-for="(item,index) in orderNum"
            :key="index">
              <span v-if="!isNaN(item)">
                <i ref="numberItem">0123456789</i>
              </span>
          <span class="comma" v-else>{{item}}</span>
        </li>
      </div>
    </div>

 .digit_set {
    background-image: url("../images/mmm.png");
    background-size: 100% 100%;
    margin-left: 5%;
    /*border: 1px solid red;*/
    /*height: 68%;*/
    width: 12%;
    text-align: center;
    line-height: 70px;
    font-size: 8rem;
    padding: 5% 0;
  }

  /*订单总量滚动数字设置*/
  .box-item {
    width: 12%;
    text-align: center;
    line-height: 70px;
    font-size: 8rem;
    padding: 2% 0;
    position: relative;
    list-style: none;
    writing-mode: vertical-lr;
    text-orientation: upright;
    /*文字禁止编辑*/
    -moz-user-select: none; /*火狐*/
    -webkit-user-select: none; /*webkit浏览器*/
    -ms-user-select: none; /*IE10*/
    -khtml-user-select: none; /*早期浏览器*/
    user-select: none;
  }

  /* 默认逗号设置 */
  .mark-item {
    width: 10px;
    height: 100px;
    margin-right: 5px;
    line-height: 10px;
    font-size: 48px;
    position: relative;
  }
  .mark-item span {
    position: absolute;
    width: 100%;
    bottom: 0;
    writing-mode: vertical-rl;
    text-orientation: upright;
  }
  /*滚动数字设置*/
  .number-item {
    margin-left: 26%;
    width: 100px;
    height: 145px;
    /*background: #ccc;*/
    list-style: none;
    margin-right: 5px;
    /*background:rgba(250,250,250,1);*/
    border-radius: 4px;
    border: 1px solid rgba(221, 221, 221, 1);
    background-image: url("../images/mmm.png");
    background-size: 100% 100%;

  }

  .number-item:first-child {
    margin-left: 0;
  }

  .number-item span {
    position: relative;
    display: inline-block;
    margin-right: 10px;
    width: 100%;
    height: 100%;
    writing-mode: vertical-rl;
    text-orientation: upright;
    overflow: hidden;

  }

  .number-item span i {
    font-style: normal;
    position: absolute;
    top: 0px;
    left: 50%;
    transform: translate(-50%, 0);
    transition: transform 1s ease-in-out;
    letter-spacing: 10px;
  }

  .number-item:last-child {
    margin-right: 0;
  }

export default {
    data() {
      return {
        orderNum: ['0', '0', '0', '0', '0'], // 默认订单总数

        // counts: ["-", "-", "-", "-", "-"],
      }
    },
    mounted() {
     
             this.toOrderNum(res.data[0].counts) // 这里输入数字即可调用
              this.setNumberTransform()

      
    },
    methods: {
      // 设置文字滚动
      setNumberTransform() {
        const numberItems = this.$refs.numberItem // 拿到数字的ref，计算元素数量
        const numberArr = this.orderNum.filter(item => !isNaN(item))
        // 结合CSS 对数字字符进行滚动,显示订单数量
        for (let index = 0; index < numberItems.length; index++) {
          const elem = numberItems[index]
          elem.style.transform = `translate(-50%, -${numberArr[index] * 10}%)`
        }
      },
      // 处理总订单数字
      toOrderNum(num) {
        num = num.toString()
        // 把订单数变成字符串
        if (num.length < 5) {
          num = '0' + num // 如未满八位数，添加"0"补位
          this.toOrderNum(num) // 递归添加"0"补位
        } else if (num.length === 5) {
          // 订单数中加入逗号
          // num = num.slice(0, 2) + ',' + num.slice(2, 5) + ',' + num.slice(5, 8)
          this.orderNum = num.split('') // 将其便变成数据，渲染至滚动数组
        } else {
          // 订单总量数字超过八位显示异常
          this.$message.warning('订单总量数字过大，显示异常，请联系客服')
        }
      },
    
    },
  }