el-table@selection-change受filter影响的问题（勾选不上）

参考：https://blog.youkuaiyun.com/Vincent_zhang1949/article/details/112858215

一、发现问题

elementUI中关于el-table的表格选择改变事件与过滤器的问题

<el-table
     ref="singleTable"
     :data="antennaList.filter(e => e.status!=='delete')"
     v-loading="antennaLoading"
     highlight-current-row
     border
     @selection-change="handleSelectionChange"
     tooltip-effect="dark"
     @current-change="handleCurrentChange"
     :header-cell-style="{background:'#eef1f6'}"
     :key="antgainKey"
     style="width: 100%">
     
     <el-table-column
         type="selection"
         width="55">
     </el-table-column>

过滤器会造成选择改变事件点击一次触发两次，第二次会清空回调参数selection中的所有的数据。

handleSelectionChange(val){
            console.log(val);
            this.multipleSelection = val;
        },

二、解决发现问题

 <el-table
    ref="singleTable"
    :data="antgainList_bak"
    v-loading="antennaLoading"
    highlight-current-row
    border
    @selection-change="handleSelectionChange"
    tooltip-effect="dark"
    @current-change="handleCurrentChange"
    :header-cell-style="{background:'#eef1f6'}"
    :key="antgainKey"
    style="width: 100%">
    
    <el-table-column
        type="selection"
        width="55">
    </el-table-column>

使用一个中间变量存储过滤后的数据，:data=“这个中间变量”

computed:{
    antgainList_bak: function(){
        return this.antgainList.filter(e => e.status!=='delete')
    }
},