【el-table】实现分页多选，保留上下分页(或模糊查询)时已勾选的数据

<el-table
    border
    stripe
    v-loading="addloading"
    :data="addDataList"
    ref="tableRef"
    :row-key="getRowKeys"
    @selection-change="handleSelectionChange"
 >
	<el-table-column type="selection" :reserve-selection="true" width="55"></el-table-column>
	...
// 设置 row-key  以及 :reserve-selection="true"

methods: {

	// 设置rowKey
    getRowKeys(row) {
      return row.id
    },
	 // 多选
    handleSelectionChange(val) {
      console.log(val);
    },
}