业务需要，动手封装一个渐变色进度条。组件适用真假进度条，

1、调用子组件的setProgress（）方法，进度条开始执行，到91%进度条进入等待状态。待后台接收完数据，修改finished值为ture,进度条继续执行到100%。

2、如果需要真的进度条，调用接口轮循获取进度值progress传入组件。

<template>
  <hprogress ref="hjprogress" @isFinished="isFinished" :finished="finished" />
</template>
mounted(){
if (!this.finished) {
          //   this.setProgress();
          this.$nextTick(function () {
            this.$refs.hjprogress.setProgress();
          });
          setTimeout(() => { //模仿后台处理完毕返回
            this.finished = true;
          }, 10000);
        }
}

<template>
  <div class="mainConImport">
    <!-- <p>数据上传中</p> -->
    <div class="mainConImportProgress">
      <div class="mainConImportProgressBack">
        <span :style="{'width':progress+'%'}"></span>
      </div>
      <div class="mainConImportProgressPresent" v-if="progress<100">已上传{{progress}}%</div>
      <div class="mainConImportProgressPresent" v-else>上传成功</div>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      timer: null,
      progress: this.progres,
      initTime: this.initTimes,
    };
  },
  props: {
    progres: {
      type: Number,
      default: 0,
    },
    initTimes: { 
      type: Number,
      default: 70,//上传进度增长周期
    },
    finished: {
      type: Boolean,
      default: false,//是否确认完成进度条，为false则会在maxSlow值处暂停，直到后台返回结果，完成进度条，可根据finished值修改模拟上传速度
    },
    minSlow: {
      type: Number,
      default: 60,//模拟上传，完成60%后，且上传完成90%之前 开始降低上传速度
    },
    maxSlow: {
      type: Number,
      default: 90,//模拟上传，完成90%后暂停上传，等待后台返回结果。
    },
  },
  watch:{
    progress(val){
        if(val == 100){
            this.$emit('isFinished')
        }
    }
  },
  methods: {
    setProgress() {
      this.timer = setTimeout(() => {
        this.progress++;
        this.setProgress();
        if (this.progress > this.minSlow && this.progress < this.maxSlow) {
          if (!this.finished) {
              this.initTime += 4; 
          }else{
              //此处可重置上传进度增长周期
          }
        }
        if (this.progress > this.maxSlow) {
          if (!this.finished) {
            this.progress = this.maxSlow + 1;
          } else {
            if (this.progress > 99) {
              clearTimeout(this.timer);
              this.timer = null;//清除定时器，避免导致内存溢出
            }
          }
        }
      }, this.initTime);
    },
  },
};
</script>
<style lang="less" scoped>
.mainConImport {
  &Progress {
    height: 60px;
    margin: 60px 0;
    &Back {
      margin: 0 auto;
      height: 20px;
      max-width: 1000px;
      background-color: #ebeef5;
      border-radius: 12px;
      border-radius: 12px;
      padding: 0 15px;
      span {
        display: inline-block;
        height: 12px;
        background-image: linear-gradient(270deg, #33bea6 0%, #c8f1d5 100%);
        border-radius: 12px;
        border-radius: 12px;
      }
    }
    &Present {
      line-height: 16px;
      font-size: 16px;
      text-align: center;
      color: #333;
      margin-top: 22px;
    }
  }
}
</style>

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