vue el-table翻页问题，勾选的问题

如果不需要回显

直接设置reserve-selection 为true

如果需要回显

1.reserve-selection 设置为false

2.需要设置row-key

3.定义2个变量selectList，selectAllIds
selectAllIds 保存唯一的id
selectList 保存勾选的值

4.el-table里增加事件
@select=“handleSelectionChange”
@select-all=“handleAllChange”

5.注意不要使用select-change
利用@select的第二个参数来增减selectAllIds， selectList里的值，确保都是勾选上的
注意

6.selectList，selectAllIds初始化的时候要塞入回显的值

7.利用toggleRowSelection勾选数据（需要放入翻页的事件里）

注意下面的例子显示的是已经封装过的el-table

 <sys-table
          :loading="loading"
          :data="tableData"
          :columns="tableColumns"
          :num="params.currPage"
          :pageSize="params.pageSize"
          :pageTotal="pageTotal"
          :height="tableHeight"
          @onChange="handleChange"
          row-key="id"
          @select="handleSelectionChange"
          @select-all="handleAllChange"
          :pageSizes="[2, 10, 15]"
          ref="table"
        >
          <template #projectName="{ scope }">
            <el-link type="primary" @click="handleView(scope.row.id)">
              {{ scope.row.projectName }}
            </el-link>
          </template>
        </sys-table>

getBillList(this.params).then(res => {
        if (res && res.status === '0') {
          this.tableData = res.data.records
          this.pageTotal = Number(res.data.total)
          this.toggleData()
        } else {
          this.tableData = []
          this.pageTotal = 0
        }
        this.loading = false
      })

    // 勾选或不勾选
    handleSelectionChange(selection, row) {
      // 每次勾选都需要判断是否勾选了已经选中的数据

      if (!this.selectAllIds.includes(row.id)) {
        this.selectList.push(row)
        this.selectAllIds.push(row.id)
      } else {
        const index = this.selectAllIds.findIndex(item => {
          return item === row.id
        })
        const indexList = this.selectList.findIndex(item => {
          return item.id === row.id
        })
        this.selectAllIds.splice(index, 1)
        this.selectList.splice(indexList, 1)
      }
    },

    handleAllChange(selecteds) {
      if (selecteds.length > 0) {
        const tempList = []
        selecteds.forEach(item => {
          if (!this.selectAllIds.includes(item.id)) {
            tempList.push(item.id)
            this.selectList.push(item)
          }
        })
        this.selectAllIds = [...this.selectAllIds, ...tempList]
      } else {
        this.tableData.forEach(item => {
          this.selectAllIds.forEach((id, index) => {
            if (id === item.id) {
              this.selectList.splice(index, 1)
            }
          })
        })
        this.selectAllIds = this.selectAllIds.filter(item => {
          const obj = this.tableData.find(itemData => {
            return itemData.id === item
          })
          return !obj
        })
      }
    },

  toggleData() {
      this.$refs.table.toggleSelection(this.selectAllIds, 'id')
    },

 private toggleSelection(rows: any, id: string = 'id') {
    this.$nextTick(() => {
      if (rows) {
        rows.forEach((row: any) => {
          const data: any[] = Array.from(this.$attrs.data)
          const obj = data.find((item: any) => {
            return item[id] === row
          })
          if (obj) {
            ;(this.$refs.table as any).toggleRowSelection(obj, true)
          }
        })
      } else {
        ;(this.$refs.table as any).clearSelection()
      }
    })
  }