vue数字滚动动画

<template>
  <div>
    <div class="record">
      <div v-for="(item, index) in list" :key="index" class="item border">
        <div
          v-for="(v, indexs) in 10"
          :key="indexs"
          class="item"
          :style="{ ...style(item) }"
        >
          {
    
    { indexs }}
        </div>
      </div>
    </div>

    <div
      @click="randomNumber"
      style="width: 250px; height: 100px; background: #ccc; margin-top: 100px"
    >
      点击生成随机数
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 父级传入
      quantity: 9, // 默认9个
      delayed: true, // 从零变化
      number: "123456789", // 数字
      time: 2000, // 过度时间
      timing: "ease", // 过度动画速度

      num: 0,
    };
  },
  computed: {
    numArr() {
      if (this.num) {
        return (this.num + "").split("");
      } else {
        return new Array(this.number.length).fill(0);
      }
    },
    list() {
      let arr = [];
      let len = this.numArr.length;
      if (this.quantity && this.quantity > len) {
        arr = [...new Array(this.quantity - len).fill(0), ...this.numArr];
      } else {
        arr = this.numArr;
      }
      return arr;
    },
  },
  methods: {
    randomNumber() {
      this.number = Math.floor(Math.random() * (999999999 - 1 + 1)) + 1;
    },
    style(e) {
      return {
        transform: `translateY(-${e * 100}%)`,
        transition: this.time + "ms",
        transitionTimingFunction: this.timing,
      };
    },
  },
  created() {
    if (this.delayed) {
      setTimeout(() => {
        this.num = this.number;
      }, 1000);
    } else {
      this.num = this.number;
    }
  },
  watch: {
    number: {
      handler(newValue, oldValue) {
        // newValue 新的值，oldValue变化前的值
        console.log(newValue, oldValue);
        this.num = newValue;
      },
    },
  },
};
</script>
<style lang="scss" scoped>
* {
  touch-action: pan-y;
}
.record {
  display: flex;
  padding-top: 100px;
  width: 100%;
  align-items: center;
  justify-content: center;
}
.item {
  width: 60px;
  height: 80px;
  font-size: 50px;
  color: rgb(109, 160, 255);
  font-weight: 600;
  margin-right: 20px;
  text-align: center;
  line-height: 80px;
  overflow: hidden;
}
.border {
  border: 1px solid #ccc;
}
</style>