手写进度条，鼠标移入显示悬浮框

效果

<template>
  <div class="box">
    <div class="mid-box">
      <div class="mid-contant">
        <!-- 提示框 -->
        <div
          v-if="hover"
          class="tooltip"
          :style="{
            top: hovertop,
          }"
        >
          <div>{{ hoverArea }}</div>
          <div>销量：{{ hoverSalse }}</div>
          <div>目标量：{{ hoverTarget }}</div>
        </div>
        <!-- 单个数据项--鼠标移入传索引，显示当前的提示框并添加移入的背景，鼠标移除隐藏提示框并取消移入背景(currentHoverIndex = -1)， -->
        <div
          class="progress-box"
          v-for="(item, index) in progressData"
          :key="index"
          @mouseover="hoverFn(index)"
          @mouseleave="(hover = false), (currentHoverIndex = -1)"
        >
          <div class="left-text">
            {{ item.area }}
          </div>

          <div class="middle-bar">
            <div class="progress-bar">
              <!-- 预警线，低于预警线爆红 -->
              <div
                class="warn-line"
                :style="{ left: item.warnLine * 100 + '%' }"
              ></div>
              <!-- 达成bar -->
              <div
                class="progress"
                :style="{
                  width: item.realValue > 1 ? '100%' : item.value,
                  background:
                    item.realValue < item.warnLine ? '#ff4938' : '#02cdcb',
                }"
              ></div>
            </div>
          </div>
          <div class="right-data">{{ item.value }}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //模拟数据
      progressData: [
        {
          area: "东部大区",
          realValue: 0.223,
          value: "22%",
          warnLine: 0.5, //预警线（达标线）
          salse: 3999,
          target: 17933,
        },
        {
          area: "北部大区",
          realValue: 0.341,
          value: "34%",
          warnLine: 0.8,
          salse: 1820,
          target: 5337,
        },
        {
          area: "南部大区",
          realValue: 0.83,
          value: "83%",
          warnLine: 0.5,
          salse: 12320,
          target: 14843,
        },
        {
          area: "中部大区",
          realValue: 0.83,
          value: "83%",
          warnLine: 0.5,
          salse: 4520,
          target: 5446,
        },
        {
          area: "西部大区",
          realValue: 1.23,
          value: "123%",
          warnLine: 0.8,
          salse: 2520,
          target: 2048,
        },
        {
          area: "全部大区数据",
          realValue: 0.53,
          value: "53%",
          warnLine: 0.5,
          salse: 1820,
          target: 3434,
        },
      ],
      //默认没有鼠标移入状态
      currentHoverIndex: -1,
      // 是否显示提示框
      hover: false,
      hoverArea: "",
      hoverSalse: 0,
      hoverTarget: 0,
    };
  },
  methods: {
    // 鼠标移入效果
    hoverFn(index) {
      this.hover= true
      this.currentHoverIndex = index;
      this.hoverArea = this.progressData[index].area;
      this.hoverSalse = this.progressData[index].salse;
      this.hoverTarget = this.progressData[index].target;
    },
  },
  computed:{
    // 提示框显示的位置：最后两条显示在当前数据项上方，其他显示在下方
    hovertop(){
      return this.progressData.length<3|| this.currentHoverIndex<this.progressData.length-2 ? (46*this.currentHoverIndex+46) +'px':(46*(this.currentHoverIndex-1)) +'px'
    }
  }
};
</script>

<style lang="less" scoped>
.box {
  position: relative;
  width: 100vw;
  height: 100vh;
  top: 0;
  left: 0;
  background-color: #0d1f50;
  color: rgba(255, 255, 255, 0.8);
  font-size: 8px;
}
.mid-box {
  width: 200px;
  height: 50vh;
  overflow: hidden;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border: 1px solid #605f5f;
  background-color: #161c4e;
  .mid-contant {
    overflow-y: scroll;
    height: 100%;
  }
}
.progress-box {
  padding: 5px 8px;
  border: 1px solid #000;
  display: flex;
  justify-content: space-between;
  align-items: center;
 box-sizing: border-box;
  .left-text {
    width: 20%;
    // 文字两行显示，溢出使用省略号
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
     
  }
  .middle-bar {
    width: 60%;
    height: 36px;

    .progress-bar {
      display: flex;
      align-items: center;
      position: relative;
      top: 0;
      left: 0;
      height: 100%;
      width: 100%;
      .warn-line {
        border-left: 1px solid #fff;
        height: 20px;
        position: absolute;
        top: calc(50% - 10px);
      }
      .progress {
        height: 16px;
      }
    }
  }
  .right-data {
    width: 20%;
  }
}
/* 滚动槽 */
::-webkit-scrollbar {
  width: 5px;
}
// 滚动条滑块
::-webkit-scrollbar-thumb {
  width: 5px;
  border-radius: 3px;
  background-color: #72afeb;
}
// 提示框
.tooltip {
  position: absolute;
  left:40%;
  border: 1px solid #1963da;
  background-color: #2c2c9e;
  color: rgba(255, 255, 255, 0.8);
  z-index: 99999;
}
</style>>

重点：通过数据控制元素的样式，比如宽高，背景等