<el-tabs type="card" v-model="tabItem">
 <el-tab-pane name="heart">
  <span slot="label"><icon name="heart" scale="2"></icon>心率</span>
  <baseline ref="heart" :chartData="{}" v-if="'heart' === tabItem"></baseline>
 </el-tab-pane>
 <el-tab-pane name="breath">
  <span slot="label"><icon name="breath" scale="2"></icon>呼吸</span>
  <baseline ref="breath" :chartData="{}" v-if="'breath' === tabItem"></baseline>
 </el-tab-pane>
 <el-tab-pane label="体动" name="move">
  <span slot="label"><icon name="move" scale="2"></icon>体动</span>
  <baseline ref="move" :chartData="{}" v-if="'move' === tabItem"></baseline>
 </el-tab-pane>
</el-tabs>

<template>
 <el-tabs v-model="activeName" @tab-click="handleClick">
  <el-tab-pane label="用户管理" name="first">用户管理</el-tab-pane>
  <el-tab-pane label="配置管理" name="second">配置管理</el-tab-pane>
  <el-tab-pane label="角色管理" name="third">角色管理</el-tab-pane>
  <el-tab-pane label="定时任务补偿" name="fourth">
    <div class="echartsBox" 
      v-loading="loadingDetail"
      element-loading-spinner="el-icon-loading"
      >
      <echart-line 
      v-if="'fourth' === activeName"  //在这里加上这句话就可以解决上面的问题
      class="CurePicture"
      :category="chartData.category"
      :data="chartData.data"
      :unit="chartData.unit"
      ></echart-line>
     </div>
  </el-tab-pane>
 </el-tabs>
</template>
<script>
import echartLine from "@/components/echarts/line"
 export default {
  components: {
  echartLine
  }, 
  data() {
   return {
    activeName: 'second'
   };
  },
  methods: {
   handleClick(tab, event) {
    console.log(tab, event);
   }
  }
 };
</script>