官网提到在element-ui table列表自定义表头，修改列标题样式、添加tooltip，需要render-header，但是在2.4.11及以后，element-ui官方已经更新了，并添加了自定义表头的方法

需要通过设置 Scoped slot 来自定义表头

demo:

<template slot="header" slot-scope="scope">
 ...
</template>

完整示范：

<template>
  <el-table
    :data="tableData.filter(data => !search || data.name.toLowerCase().includes(search.toLowerCase()))"
    style="width: 100%">
    <el-table-column
      label="Date"
      prop="date">
    </el-table-column>
    <el-table-column
      prop="name">
      <template slot="header" slot-scope="scope">
        <span>名字</span>
        <el-tooltip class="item" effect="dark" content="Right Center 提示文字" placement="right">
          <i class="el-icon-question"></i>
        </el-tooltip>
      </template>
    </el-table-column>
    <el-table-column
      align="right">
      <template slot="header" slot-scope="scope">
        <el-input
          v-model="search"
          size="mini"
          placeholder="输入关键字搜索"/>
      </template>
      <template slot-scope="scope">
        <el-button
          size="mini"
          @click="handleEdit(scope.$index, scope.row)">Edit</el-button>
        <el-button
          size="mini"
          type="danger"
          @click="handleDelete(scope.$index, scope.row)">Delete</el-button>
      </template>
    </el-table-column>
  </el-table>
</template>

<script>
  export default {
    data() {
      return {
        tableData: [{
          date: '2016-05-02',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1518 弄'
        }, {
          date: '2016-05-04',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1517 弄'
        }, {
          date: '2016-05-01',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1519 弄'
        }, {
          date: '2016-05-03',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1516 弄'
        }],
        search: ''
      }
    },
    methods: {
      handleEdit(index, row) {
        console.log(index, row);
      },
      handleDelete(index, row) {
        console.log(index, row);
      }
    },
  }
</script>

效果：