elementui中Table切换分页保存多选框选中的数据

    <el-table
      ref="multipleTable"
      row-key="id"
      :data="tableData"
      tooltip-effect="dark"
      style="width: 100%"
      @selection-change="handleSelectionChange">
      <el-table-column
      reserve-selection
      type="selection"
      width="55">
      el-table-column>
      <el-table-column
      label="日期"
      width="120">
      <template slot-scope="scope">{{ scope.row.date }}template>
      el-table-column>
      <el-table-column
      prop="name"
      label="姓名"
      width="120">
      el-table-column>
      <el-table-column
      prop="address"
      label="地址"
      show-overflow-tooltip>
      el-table-column>
  el-table>
  <div style="margin-top: 20px">
      <el-button @click="toggleSelection([tableData[1], tableData[2]])">切换第二、第三行的选中状态el-button>
      <el-button @click="toggleSelection()">取消选择el-button>
  div>

主要是添加 row-key="id"和 reserve-selection ：仅对 type=selection 的列有效，类型为 Boolean，为 true 则会在数据更新之后保留之前选中的数据（需指定 row-key的值唯一）

      toggleSelection(rows) {
        if (rows) {
          rows.forEach(row => {
            this.$refs.multipleTable.toggleRowSelection(row);
          });
        } else {
          this.$refs.multipleTable.clearSelection();
        }
      },
      handleSelectionChange(val) {
        this.multipleSelection = val;
      },