Add a floating prompt for the header icon in the ElementUI table

<el-table-column
    label="operation"
    fixed="right"
    :render-header="tableAction"
    width="120">
    <!--scope is userList scope.row is the current row data-->
    <template slot-scope="scope">
        <el-button @click="editCar(scope.row)" type="primary" icon="el-icon-edit" size="small" circle></el-button>
        <el-button @click="delCar(scope.row.carId)" type="danger"
                   icon="el-icon-delete" circle size="small"></el-button>
    </template>
</el-table-column>

 //Table operation prompt tableAction() {
     return this.$createElement('HelpHint', {
         props: {
             content: 'Edit vehicle/Delete vehicle'
         }
     }, 'operate');
 },

import HelpHint from '~/components/HelpHint/HelpHint.vue';

<template>
  <span>
    <span style="margin-right: 8px"><slot></slot></span>
    <el-tooltip :content="content" :placement="placement">
      <i class="el-icon-question" style="cursor: pointer;"></i>
    </el-tooltip>
  </span>
</template>
<script>
  export default {
    name: 'HelpHint',
    props: {
      placement:
        default: 'top'
      },
      content: String,
    },
    data() {
      return {}
    },
  }
</script>