使用作用域插槽动态渲染el-table，异步请求到的数据无法渲染的问题

Question

<!--
 * @Author: h
 * @Date: 2021-11-09 15:38:41
 * @LastEditors: h
 * @LastEditTime: 2021-11-12 16:28:37
 * @Description: 
-->

<template>
  <div class="mod-config">
    <el-form
      :inline="true"
      :model="dataForm"
      @keyup.enter.native="getDataList()"
      label-width="100px"
    >
      <el-row>
        <el-col :span="8">
          <el-form-item label="告警名称">
            <el-input
              v-model="dataForm.newAlarmName"
              placeholder="告警名称"
              clearable
            ></el-input>
          </el-form-item>
        </el-col>

        <el-col :span="8">
          <el-form-item label="观测站类型" prop="type">
            <el-select
              v-model="dataForm.newType"
              style="width:100%"
              placeholder="观测站类型"
            >
              <el-option
                v-for="item in types"
                :key="item.id"
                :label="item.name"
                :value="item.name"
              ></el-option>
            </el-select>
          </el-form-item>
        </el-col>
      </el-row>
      <el-row>
        <el-col :span="8">
          <el-form-item label="观测站编号">
            <el-input
              v-model="dataForm.newCode"
              placeholder="观测站编号"
              clearable
            ></el-input>
          </el-form-item>
        </el-col>

        <el-col :span="8">
          <el-form-item label="观测站名称">
            <el-input
              v-model="dataForm.newName"
              placeholder="观测站名称"
              clearable
            ></el-input>
          </el-form-item>
        </el-col>
        <el-col :span="8">
          <el-form-item>
            <el-button @click="queryByForm()" type="primary">查询</el-button>
            <el-button type="primary" @click="addOrUpdateHandle()"
              >新增</el-button
            >
          </el-form-item>
        </el-col>
      </el-row>
    </el-form>
    <el-table
      :data="dataone"
      border
      v-loading="dataListLoading"
      style="width: 100%;"
    >
      <el-table-column
        prop="name"
        header-align="center"
        align="center"
        label="告警名称"
      >
      </el-table-column>
      <el-table-column
        prop="stationType_dictText"
        header-align="center"
        align="center"
        label="观测站类型"
      >
      </el-table-column>
      <el-table-column
        header-align="center"
        align="center"
        label="观测数据"
     
      >
      <template slot-scope="scope">
        <p>{{searchId(scope.row.dataflowId)}}</p>
      </template>
      </el-table-column>
      <el-table-column
        prop="symbol"
        header-align="center"
        align="center"
        label="运算符"
      >
      </el-table-column>
      <el-table-column
        prop="condi"
        header-align="center"
        align="center"
        label="触发条件"
      >
      </el-table-column>
      <el-table-column
        header-align="center"
        align="center"
        label="适用的观测站"
        prop="stationCodes_dictText"
      >
        <!-- <template slot-scope="scope">
          <p>{{ transferString(scope.row.stationCodes) }}</p>
        </template> -->
      </el-table-column>
      <el-table-column
        fixed="right"
        header-align="center"
        align="center"
        width="150"
        label="操作"
      >
        <template slot-scope="scope">
          <el-button
            type="text"
            size="small"
            @click="addOrUpdateHandle(scope.row.id)"
            >编辑</el-button
          >
          <el-button
            type="text"
            size="small"
            @click="deleteHandle(scope.row.id, scope.row.name)"
            >删除</el-button
          >
        </template>
      </el-table-column>
    </el-table>
    <el-pagination
      @size-change="sizeChangeHandle"
      @current-change="currentChangeHandle"
      :current-page="pageIndex"
      :page-sizes="[10, 20, 50, 100]"
      :page-size="pageSize"
      :total="totalPage"
      layout="total, sizes, prev, pager, next, jumper"
    >
    </el-pagination>
    <!-- 弹窗, 新增 / 修改 -->
    <add-or-update
      v-if="addOrUpdateVisible"
      ref="addOrUpdate"
      @refreshDataList="getDataList"
    ></add-or-update>
  </div>
</template>

<script>
import AddOrUpdate from './watercommonalarm-add-or-update';
export default {
  data() {
    return {
      dataForm: {
        key: '',
        newAlarmName: '',
        newType: '',
        newCode: '',
        newName: ''
      },
      types: [],
      dataList: [],
      dataone: [],
      stations: [],
      pageIndex: 1,
      pageSize: 10,
      totalPage: 0,
      dataListLoading: false,
      addOrUpdateVisible: false
    };
  },
  components: {
    AddOrUpdate
  },
  activated() {
    this.getTypesData();
    this.getDataList();
  },
  methods: {
    // 获取观测站类型数据
    getTypesData() {
      this.$http({
        url: this.$http.adornUrl(`/sys/dicttypedata/list`),
        method: 'get',
        params: this.$http.adornParams({
          limit: -1,
          typeId: 6
        })
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.types = data.page.list;
        } else {
          this.$message.error(data.msg);
        }
      });
      this.$http({
        url: this.$http.adornUrl(`/sys/dicttypedata/list`),
        method: 'get',
        params: this.$http.adornParams({
          limit: -1,
          typeId: 9
        })
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.optypes = data.page.list;
        } else {
          this.$message.error(data.msg);
        }
      });
    },
    // 获取数据列表
    getDataList() {
      this.dataListLoading = true;
      this.$http({
        url: this.$http.adornUrl('/management/tbwatercommonalarm/list'),
        method: 'get',
        params: this.$http.adornParams({
          page: this.pageIndex,
          limit: this.pageSize,
          key: this.dataForm.key
        })
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.dataList = data.page.list;
          this.dataone = this.dataList;
          console.log(this.dataone);
          this.totalPage = data.page.totalCount;
        } else {
          this.dataList = [];
          this.totalPage = 0;
        }
        this.dataListLoading = false;
      });
    },
     /**
     * @ description: 通过id查找观测数据
     * @param {*} id
     * @ return:
     */
    searchId(id) {
      if (id != null) {
        this.$http({
          url: this.$http.adornUrl(`/management/tbwaterdataflow/info/${id}`),
          method: 'get'
        }).then(({ data }) => {
          if (data && data.code === 0) {
            console.log(data.tbWaterDataflow.name)
            return data.tbWaterDataflow.name;
          }
        });
      }
    },
    queryByForm() {
      this.dataListLoading = true;
      this.$http({
        url: this.$http.adornUrl('/management/tbwatercommonalarm/list'),
        method: 'get',
        params: this.$http.adornParams({
          page: this.pageIndex,
          limit: this.pageSize,
          key: this.dataForm.key,
          alarmName: this.dataForm.newAlarmName,
          stationCode: this.dataForm.newCode,
          stationType: this.dataForm.newType,
          stationName: this.dataForm.newName
        })
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.dataList = data.page.list;
          this.dataone = this.dataList;
          console.log(this.dataone);
          this.totalPage = data.page.totalCount;
        } else {
          this.dataList = [];
          this.totalPage = 0;
        }
        this.dataListLoading = false;
      });
    },
    // 每页数
    sizeChangeHandle(val) {
      this.pageSize = val;
      this.pageIndex = 1;
      this.getDataList();
    },
    // 当前页
    currentChangeHandle(val) {
      this.pageIndex = val;
      this.getDataList();
    },
    // 新增 / 修改
    addOrUpdateHandle(id) {
      this.addOrUpdateVisible = true;
      this.$nextTick(() => {
        this.$refs.addOrUpdate.init(id);
      });
    },
    // 删除
    deleteHandle(id, name) {
      this.$confirm(`确定对${name}进行删除操作?`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.$http({
          url: this.$http.adornUrl(`/management/tbwatercommonalarm/delete`),
          method: 'delete',
          data: this.$http.adornData([id], false)
        }).then(({ data }) => {
          if (data && data.code === 0) {
            this.$message({
              message: '操作成功',
              type: 'success',
              duration: 1500,
              onClose: () => {
                this.getDataList();
              }
            });
          } else {
            this.$message.error(data.msg);
          }
        });
      });
    },

    /**
     * @ description: string数组转int数组
     * @param {*} stationCodes
     * @ return:
     */
    transferString(stationCodes) {
      var strArry = stationCodes.split(',');
      var intArry = [];
      strArry.forEach(item => {
        intArry.push(parseInt(item));
      });
      return intArry;
    }
  }
};
</script>

1.图片右侧可以看出请求重复发送了很多这是为什么呢？
2.试用searchId返回的数据为什么没有在观测数据那一列渲染？而且我后面对table数据源进行修改，新加的属性也不会渲染到列上，这是咋回事？
3.应该怎么修改呢？
希望大佬不吝赐教！！！

Answer 1

循环里面调接口， 你还问为什么请求那么多次？？， 谁让你们这样设计逻辑的
看样子后端的锅比较大， 这个数据应该在列表接口一并返回，而不是列表循环里面再单独去请求

<el-table-column
        header-align="center"
        align="center"
        label="观测数据"
     
      >
      <template slot-scope="scope">
        <p>{{searchId(scope.row.dataflowId)}}</p>
      </template>
      </el-table-column>

第二个问题，为啥那一列没数据？ 从头到尾我就没看到你数据里有这个参数 “stationCodes_dictText”， 如果dataone里面一开始就没这个参数，你即使后面请求成功附加进去了，也照样不会触发dataone的更新， 因为vue2里面只有一开始有这个参数的才能监听到。 vue3就没这个问题。 还有一点就是这么多循环一定会触发频繁的更新，太频繁的话vue是会跳过一些更新。

<el-table-column
        header-align="center"
        align="center"
        label="适用的观测站"
        prop="stationCodes_dictText"
      >
        <!-- <template slot-scope="scope">
          <p>{{ transferString(scope.row.stationCodes) }}</p>
        </template> -->
      </el-table-column>