vxe-table的复选框更新页面后没有选项

过程就是在我们使用vxe-table的时候，页面进行了更新，重新渲染，但是之前在vxe-table中选中的的选项就没了，下面来看一下过程

一开始选择了两个选项

当我勾选上面的 “备选项” 对页面进行刷新时，下面勾选的选项就自动清空了

代码：

<template>
  <div>
    <el-checkbox v-model="checked">备选项</el-checkbox>
    <vxe-table
      border
      ref="xTable1"
      :data="tableData"
      @checkbox-all="selectAllEvent"
      @checkbox-change="selectChangeEvent"
      :key="Math.random()"
    >
      <vxe-column type="checkbox" width="60"></vxe-column>
      <vxe-column field="name" title="Name"></vxe-column>
      <vxe-column field="sex" title="Sex"></vxe-column>
      <vxe-column field="age" title="Age"></vxe-column>
      <vxe-column field="address" title="Address" show-overflow></vxe-column>
    </vxe-table>
  </div>
</template>

<script>
import VXETable from 'vxe-table'

export default {
  data() {
    return {
      checked: true,
      tableData: [
        {
          id: 10001,
          name: 'Test1',
          role: 'Develop',
          sex: 'Man',
          age: 28,
          address: 'test abc',
        },
        {
          id: 10002,
          name: 'Test2',
          role: 'Test',
          sex: 'Women',
          age: 22,
          address: 'Guangzhou',
        },
        {
          id: 10003,
          name: 'Test3',
          role: 'PM',
          sex: 'Man',
          age: 32,
          address: 'Shanghai',
        },
        {
          id: 10004,
          name: 'Test4',
          role: 'Designer',
          sex: 'Women',
          age: 23,
          address: 'test abc',
        },
        {
          id: 10005,
          name: 'Test5',
          role: 'Develop',
          sex: 'Women',
          age: 30,
          address: 'Shanghai',
        },
      ],
    }
  },
  methods: {
    selectAllEvent({ checked }) {
      const records = this.$refs.xTable1.getCheckboxRecords()
      console.log(checked ? '所有勾选事件' : '所有取消事件', records)
    },
    selectChangeEvent({ checked }) {
      const records = this.$refs.xTable1.getCheckboxRecords()
      console.log(checked ? '勾选事件' : '取消事件', records)
    },
    getSelectEvent() {
      let selectRecords = this.$refs.xTable1.getCheckboxRecords()
      VXETable.modal.alert(selectRecords.length)
    },
  },
}
</script>

<style lang="" scoped></style>

原因：我们给vxe-table表格添加了 key 属性，把 key 属性移除掉就好了