实现效果

1.实现代码

<template>
  <div class="test">
    <ul :style="{ width: config.width + 'px', height: config.height + 'px' }">
      <li><span v-if="num >= 10"></span></li>
      <li><span v-if="num >= 20"></span></li>
      <li><span v-if="num >= 30"></span></li>
      <li><span v-if="num >= 40"></span></li>
      <li><span v-if="num >= 50"></span></li>
      <li><span v-if="num >= 60"></span></li>
      <li><span v-if="num >= 70"></span></li>
      <li><span v-if="num >= 80"></span></li>
      <li><span v-if="num >= 90"></span></li>
      <li><span v-if="num >= 100"></span></li>
    </ul>
  </div>
</template>

<script>
export default {
  name: "volume",
  components: {},
  props: {
    //传入百分比数值
    num: {
      type: Number,
      default: 50,
    },
    config: {
      type: Object,
      default: () => ({
        width: 60,
        height: 22,
      }),
    },
  },
};
</script>

<style lang="scss" scoped>
ul {
  display: flex;
  justify-content: space-around;
  overflow: hidden;
  li {
    width: 8%;
    border-radius: 2px;
    background: rgba(0, 0, 0, 0.5);
    position: relative;
    span {
      position: absolute;
      top: 0;
      left: 0;
      display: inline-block;
      width: 100%;
      height: 100%;
      background: limegreen;
    }
    &:nth-child(1) {
      height: 4px;
      margin-top: 18px;
    }
    &:nth-child(2) {
      height: 6px;
      margin-top: 16px;
    }
    &:nth-child(3) {
      height: 8px;
      margin-top: 14px;
    }
    &:nth-child(4) {
      height: 10px;
      margin-top: 12px;
    }
    &:nth-child(5) {
      height: 12px;
      margin-top: 10px;
    }
    &:nth-child(6) {
      height: 14px;
      margin-top: 8px;
    }
    &:nth-child(7) {
      height: 16px;
      margin-top: 6px;
      span {
        background: rgb(255, 130, 0);
      }
    }
    &:nth-child(8) {
      height: 18px;
      margin-top: 4px;
      span {
        background: rgb(255, 90, 0);
      }
    }
    &:nth-child(9) {
      height: 20px;
      margin-top: 2px;
      span {
        background: rgb(255, 50, 0);
      }
    }
    &:nth-child(10) {
      height: 22px;
      margin-top: 0px;
      span {
        background: rgb(255, 0, 0);
      }
    }
  }
}
</style>

2.使用示例

<template>
  <div class="test">
    测试
    <Volume :num="40"></Volume>
    <Volume :num="60"></Volume>
    <Volume :num="80"></Volume>
    <Volume :num="100"></Volume>
  </div>
</template>

<script>
import { Volume } from "@/components";
export default {
  name: "test",
  components: { Volume },
};
</script>

噢利给！