Tooltip text prompt Click the small icon to display the text

<el-tooltip v-else class="item" effect="light" content="流程标识不可修改！" placement="top">
   <i style="padding-left: 5px;" class="el-icon-question" />
</el-tooltip>

toopltip as a slot, displayed behind the form label

<el-form-item prop="className">
          <span slot="label">
            实体类名称
            <el-tooltip content="默认去除表名的前缀。如果存在重复，则需要手动添加前缀，避免 MyBatis 报 Alias 重复的问题。" placement="top">
              <i class="el-icon-question"></i>
            </el-tooltip>
          </span>
          <el-input placeholder="请输入" v-model="info.className" />
        </el-form-item>