antd-vue Table组件翻页后保留上一页已选的数据

由于官方组件的onChange方法在分页重载数据时会清空selectedRows，因此我们改用onSelect和onSelectAll事件来维护selectedRows状态，避免数据丢失问题。代码如下（只抽取了选中的逻辑）

//表格的属性
:rowSelection="{
   selectedRowKeys: selectedRowKeys,
   onChange: onSelectChange,
   onSelect:onSelect,
   onSelectAll:onSelectAll,
}"

export default {
  data(){
    return {
        selectedRowKeys:[],
        selectedRows:[]
    }
  },
  methods:{
    onSelectChange(selectedRowKeys, selectedRows) {
      this.selectedRowKeys = selectedRowKeys
      // this.selectedRows = selectedRows // 注释这里，交由下面onSelect，onSelectAll来处理
    },
    onSelect(record, selected, selectedRows) {
      if (selected) {
        this.selectedRows.push(record)
      }

      if (!selected) {
        const delIndex = this.selectedRows.findIndex(val => {
          return val.id === record.id
        })
        this.selectedRows.splice(delIndex, 1)
      }
    },
    onSelectAll(selected, selectedRows, changeRows) {
      if (selected) {
        this.selectedRows = this.selectedRows.concat(changeRows)
      }
      if (!selected) {
        let selectedRows = JSON.parse(JSON.stringify(this.selectedRows))
        const delIndex = []
        selectedRows.forEach((item, index) => {
          changeRows.forEach((val, itemIndex) => {
            if (item.id === val.id) {
              delIndex.push(index)
            }
          })
        })
        delIndex.forEach(item => {
          delete selectedRows[item]
        })
        selectedRows = selectedRows.filter(item => {
          return item !== undefined
        })
        this.selectedRows = selectedRows
      }
    },
  }
}