element-ui中，使用el-tabs嵌套el-table，初次加载tab页时table表头和表格数据错位

Question

### 问题描述
element-ui中，使用el-tabs嵌套el-table，每个tab页下放置引入的子组件。并有v-if控制它的显示。子组件中的el-table中设置了列的宽度。问题出在初次加载tab页时table表头和表格数据错位。点击其他tab页再切换回去的时候错位消失了。
下图是初次点击左侧菜单进来时的状态
点击其他tab页比如已审批以后，再切回原来的第一个tab后

### 相关代码
父组件中

<el-tabs v-model="activeName" :before-leave="beforeLeave" @tab-click="handleClick">
  <el-tab-pane v-if="isZhiDuiManage" label="我发起的" name="1">
    <process-index ref="zhiDuiFillIn" :content-type="1" />
  </el-tab-pane>
  <el-tab-pane v-if="isApprover || isHighManager" label="待审批" name="2">
    <process-index ref="waitApprover" :content-type="2" />
  </el-tab-pane>
  <el-tab-pane v-if="isApprover || isHighManager" label="已审批" name="3">
    <process-index ref="alreadyApprover" :content-type="3" />
  </el-tab-pane>
  <el-tab-pane v-if="isHighManager" label="机关填报" name="4">
    <other-grid ref="builtInGrid" :content-type="4" />
  </el-tab-pane>
  <el-tab-pane v-if="isHighManager" label="明细汇总" name="5">
    <other-grid ref="sumGrid" :content-type="5" />
  </el-tab-pane>
  <el-tab-pane v-if="isHighManager" :label="isZongDui?'总队明细':'部局明细'" name="6">
    <process-index ref="highGrid" :content-type="6" />
  </el-tab-pane>
</el-tabs>
<script>
mounted() {
this.getTableData(this.activeName)
},
activated() {
if (this.refreshTable) {
  this.getTableData(this.activeName)
  this.$store.dispatch('setRefreshTable', '')
},
methods: {
    getTableData(activeName) {
  switch (activeName) {
    case '1':this.$refs.zhiDuiFillIn.getTableData()
      break
    case '2':this.$refs.waitApprover.getTableData()
      break
    case '3':this.$refs.alreadyApprover.getTableData()
      break
    case '4':this.$refs.builtInGrid.getTableData()
      break
    case '5':this.$refs.sumGrid.getTableData()
      break
    case '6':this.$refs.highGrid.getTableData()
      break

子组件processindex中

<el-table v-loading="loading" :data="tableData" highlight-current-row border fit>
  <el-table-column prop="searchTitle" label="标题" align="left" width="300"/>
  <el-table-column prop="createTime" label="创建时间" align="left"/>
  <el-table-column prop="createPerson" label="创建人" align="left"/>
  <el-table-column prop="currentStatus" label="当前状态" align="left"/>
  <el-table-column prop="currentNode" label="当前节点" align="left"/>
  <el-table-column label="操作" align="left">
  </el-table-column>
</el-table>
methods: {
getTableData() {
  this.loading = true
  const param = { pageSize: this.pageSize, pageNum: this.pageNum }
  Object.assign(param,     this.$refs.SearchTool.queryCondition)
  switch (this.contentType) {
    case 1:param.operationType = 1
      break
    case 2:param.operationType = 2
      break
    case 3:param.operationType = 3
      break
    case 6:param.operationType = 1
  }

  this.getProcessDatas(param)
},
getProcessDatas(param) {
  getASDetailProcess(param).then(res => {
    if (res.success) {
      this.total = res.data.total
      this.tableData = res.data.list
    }
    this.loading = false
  }).catch(() => {
    this.loading = false
  })
},

Answer 1

我是监听数据获取之后，手动调用一下这个方法，手动触发表格视图更新

this.$refs.tableRef.doLayout();