element ui库table 表格组件通过条件渲染（v-if）表格列时导致对应列数据错乱
<el-table :data="tableData" >
<el-table-column prop="date" label="日期" v-if="show"> </el-table-column>
<el-table-column prop="name" label="姓名"> </el-table-column>
</el-table>
此时只需在条件渲染列加上key即可
<el-table :data="tableData" >
<el-table-column prop="date" label="日期" v-if="show" key="1"> </el-table-column>
<el-table-column prop="name" label="姓名"> </el-table-column>
</el-table>
