实现前端数字滚动效果

效果如下：
代码如下：
<!-- demo.vue -->
<template>
<div class="statisContent" v-loading="loading">
    <div class="chartNum">
        <h3 class="orderTitle">订单总量</h3>
        <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>
</div>
</template>

<script>
export default {
    data() {
        return {
            loading: false,
            orderNum: ['0', '0', ',', '0', '0', '0', ',', '0', '0', '0'],
            count: 123
        }
    },
    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 < 8) {
            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 === 8) {
            // 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.$message.warning('订单总量数字过大，显示异常，请联系客服')
          }
        },
        increaseNumber () {
          let self = this
          this.timer = setInterval(() => {
            self.count = self.count + this.getRandomNumber(1, 100)
            this.toOrderNum(self.count)
            this.$nextTick(() => {
                self.setNumberTransform(self.count)
            })
          }, 3000)
        },
        getRandomNumber (min, max) {
          return Math.floor(Math.random() * (max - min + 1) + min)
        }
    },
    mounted() {
        this.increaseNumber()
    }
}
</script>

<style lang=scss>
.statisContent{
    padding-top: 20px;
    background-color: #000;
    .number-item {
        width: 41px;
        height: 75px;
        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);
        display: inline-block;
        font-size: 60px;
        & > span {
            position: relative;
            display: inline-block;
            margin-right: 10px;
            width: 100%;
            height: 100%;
            writing-mode: vertical-rl;
            text-orientation: upright;
            overflow: hidden;
            & > i {
                font-style: normal;
                position: absolute;
                top: 7px;
                left: 50%;
                transform: translate(-50%,0);
                transition: transform 1s ease-in-out;
                letter-spacing: 10px;
            }
        }
    }
    .number-item:last-child {
        margin-right: 0;
    }
    .comma{
        display: inline-block;
        color: #fff;
        font-size: 30px;
    }
    .mark-item{
        display: inline-block;
    }
}
</style>