elementUI table 给表头添加气泡显示（鼠标悬浮显示注释）

前言：

公司出现这样的需求，产品要求给表格的表头部分字段添加解释说明，让用户知道这个字段的详细含义。之前倒是没有遇到过类似的问题，并不清楚怎么添加，于是去看element UI 组件文档。

element UI 文档

文档显示：（使用插槽，我看看到底是怎么个事儿）

文档代码:

<template>
  <el-table :data="filterTableData" style="width: 100%">
    <el-table-column label="Date" prop="date" />
    <el-table-column label="Name" prop="name" />
    <el-table-column align="right">
      <template #header>  //利用具名插槽，对表头进行自定义
        <el-input v-model="search" size="small" placeholder="Type to search" />
      </template>
      <template #default="scope">  
        <el-button size="small" @click="handleEdit(scope.$index, scope.row)">
          Edit
        </el-button>
        <el-button
          size="small"
          type="danger"
          @click="handleDelete(scope.$index, scope.row)"
        >
          Delete
        </el-button>
      </template>
    </el-table-column>
  </el-table>
</template>

<script lang="ts" setup>
import { computed, ref } from 'vue'

interface User {
  date: string
  name: string
  address: string
}

const search = ref('')
const filterTableData = computed(() =>
  tableData.filter(
    (data) =>
      !search.value ||
      data.name.toLowerCase().includes(search.value.toLowerCase())
  )
)
const handleEdit = (index: number, row: User) => {
  console.log(index, row)
}
const handleDelete = (index: number, row: User) => {
  console.log(index, row)
}

const tableData: User[] = [
  {
    date: '2016-05-03',
    name: 'Tom',
    address: 'No. 189, Grove St, Los Angeles',
  },
  {
    date: '2016-05-02',
    name: 'John',
    address: 'No. 189, Grove St, Los Angeles',
  },
  {
    date: '2016-05-04',
    name: 'Morgan',
    address: 'No. 189, Grove St, Los Angeles',
  },
  {
    date: '2016-05-01',
    name: 'Jessy',
    address: 'No. 189, Grove St, Los Angeles',
  },
]
</script>

修改后的效果：

<template>
  <el-table :data="filterTableData" style="width: 100%">
  <el-table-column prop="department" align="center" label="标**值">
        <template #header>
          <span>标**值</span>
         <!--  使用气泡组件展示注释内容-->
          <el-tooltip class="box-item" effect="dark" content="超出标**值时达到相关等级" placement="top-start">
            <el-icon>
              <InfoFilled />
            </el-icon>
          </el-tooltip>
        </template>
      </el-table-column>
  </el-table>
</template>

页面效果：