el-table中加图标文字提示

 "tableData" style="width: 100%" max-height="250">
      <el-table-column fixed prop="aaa" label="日期" width="150" />
      <el-table-column prop="bbb" label="日期" width="150" />
      <el-table-column prop="ccc" label="日期" width="150" />
      <el-table-column prop="ddd" label="日期" width="150">
        <template slot="header">
          <el-tooltip class="item" effect="dark" content="Top Left 提示文字" placement="top-start">
            <p>学不会<i class="el-icon-user">i>p>
          el-tooltip>
        template>
      el-table-column>