vue怎么实现element表格里表头信息提示功能？

<template>
<!-- 处理element表格表头文字提示特别添加全局注册组件  -->
<div class="promt-message-tooltip">
    <el-tooltip effect="light" placement="left">
        <div slot="content">
            <p v-for="item in messages" :key="item">
                {{item}}
            </p>
        </div>
        <i class="el-icon-question" class="tips-icon"></i>
    </el-tooltip>
</div>
</template>
<script>
export default {
  props: ['messages']
}
</script>
<style lang="scss">
.promt-message-tooltip {
  .tips-icon {
    color:#409eff;
    margin-left:5px;
    font-size:14px;
  }
}
</style>

import promptMessage from './promptMessage.vue'
export default {
  install: (Vue) => {
    Vue.component('promptMessage', promptMessage)
  }
}

<template>
<el-table tooltip-effect="light" :data="dataList" border >
  <el-table-column label="操作" :render-header="renderHeader">
    <template slot-scope="scope">删除</template>
  </el-table-column>
</el-table>
</template>
<script>
export default {
  methods: {
    // render 事件
    renderHeader (h, { column }) {
      return h(
        'div', {
          style: 'display:flex;margin:auto;'
        },
        [
          h('span', column.label),
          // 直接用组件就完事了
          h('prompt-message', {
            props: { messages: ['kaimo需要的tips！'] }
          })
        ]
      )
    }
  }
}
</script>