vue项目之数量占比进度条实现

功能说明：

1、点击开始，滚动条自动加；
2、点击停止，滚动条停止加；

封装如下

<template>
  <div>
    <div class="progress-bar">
      <div
        class="progress"
        :style="{
          width: progressRatio + '%'
        }"
      >
        {{ surplusProgress }}
      </div>
      {{ totalProgress }}
    </div>
    {{ surplusProgress }}
    <button @click="start()">开始</button>
    <button @click="stop()">停止</button>
  </div>
</template>

<script>
export default {
  name: 'index',
  components: {},
  props: {
    total: {
      type: Number
    },
    surplus: {
      type: Number
    }
  },
  data() {
    return {
      totalProgress: 0,
      surplusProgress: 0,
      progressRatio: 0,
      clearInt: null // 定时器名
    }
  },
  computed: {
    // 用于监听两个值同时存在的情况
    progress() {
      const { surplus, total } = this
      return {
        surplus,
        total
      }
    }
  },
  watch: {
    progress(newVal) {
      this.totalProgress = newVal.total
      this.surplusProgress = newVal.surplus
      // 注意这里是当前剩余的值比上总值的一个比例显示
      this.progressRatio = (newVal.surplus / newVal.total) * 100
    }
  },
  methods: {
    start() {
      let _this = this
      // 增加的值 = 总数量 / 100
      let addNum = _this.totalProgress / 100
      clearInterval(_this.clearInt)
      _this.clearInt = setInterval(function () {
        _this.progressRatio = _this.progressRatio + 1
        // 这里剩余的值 必须按照比例去增加 才可以最终到达总值
        _this.surplusProgress = ((_this.surplusProgress * 100 + addNum * 100) / 100).toFixed(1)
        if (_this.progressRatio >= 100) {
          clearInterval(_this.clearInt)
          _this.progressRatio = _this.progressRatio
          _this.surplusProgress = parseInt(_this.surplusProgress)
        }
      }, 100)
    },
    stop() {
      clearInterval(this.clearInt)
    }
  }
}
</script>

<style  lang="scss" scoped>
.progress-bar {
  width: 500px;
  height: 30px;
  color: #000;
  text-align: center;
  line-height: 30px;
  box-sizing: border-box;
  margin-top: 50px;
  margin-bottom: 20px;
  border: 1px solid gray;
  box-shadow: -1px -1px 1px #000;
  background: rgb(177, 174, 174);
  position: relative;
  .progress {
    height: 100%;
    background: #3165c5;
    color: #fff;
    overflow: hidden;
    position: absolute;
    opacity: 0.5;
    text-align: center;
  }
}
</style>

组件使用

<template>
  <div class="content-box">
    <div class="container">
      <Progress :total="total1" :surplus="surplus1" />
      <Progress :total="total2" :surplus="surplus2" />
    </div>
  </div>
</template>

<script>
import Progress from '@/components/ProgressBar'
export default {
  name: 'record',
  components: {
    Progress
  },
  data() {
    return {
      surplus1: 0,
      total1: 0,
      surplus2: 0,
      total2: 0
    }
  },
  activated() {
    let _this = this
    // 模拟请求情况
    setTimeout(() => {
      _this.surplus1 = 30
      _this.total1 = 100
      _this.surplus2 = 60
      _this.total2 = 220
    }, 3000)
  },
  methods: {},
  mounted() {}
}
</script>

<style scoped>
</style>

效果如下

遇到问题

在到达终点时，总数和剩余值不一致问题，查明问题原因是小数点的问题，目前保留一位小数点；