element-ui el-table使用v-if来控制列的显示隐藏 出现列位置错乱问题

描述：
在el-table中使用v-if控制某些列的显示或者隐藏，当activeIndex数据发生改变时，下面这种写法会导致表格的列位置错乱，使用v-show没效果，截图及代码如下：

<el-table ref="multipleTable" :data="tableData.slice((currentPage - 1) * pageSize, currentPage * pageSize )  " tooltip-effect="dark" style="width: 100%" :row-key=" (row) => { return row.id;  }  " @selection-change="handleSelectionChange">
      <el-table-column v-if="taskDetailsData.handleState == 0"  type="selection" align="center" width="55">
       </el-table-column>
      <el-table-column label="缩略图">
            <template slot-scope="{ row }">
              <img v-show="row.type == 'image'" class="tableImg" :src="row.img" alt="没有图片" />
            </template>
      </el-table-column>
      <el-table-column label="素材是否合格" v-if="taskDetailsData.handleState != 0">
         <template slot-scope="{ row }">{{ row.audit == 'true' ? '合格' : '不合格' }}</template>
      </el-table-column>
 </el-table>

解决：
给列添加唯一key
①

<el-table ref="multipleTable" :data="tableData.slice((currentPage - 1) * pageSize, currentPage * pageSize )  " tooltip-effect="dark" style="width: 100%" :row-key=" (row) => { return row.id;  }  " @selection-change="handleSelectionChange">
      <el-table-column :key="Math.random()" v-if="taskDetailsData.handleState == 0"   type="selection" align="center" width="55">
       </el-table-column>
      <el-table-column label="缩略图" :key="Math.random()">
            <template slot-scope="{ row }">
              <img v-show="row.type == 'image'" class="tableImg" :src="row.img" alt="没有图片" />
            </template>
      </el-table-column>
      <el-table-column label="素材是否合格" :key="Math.random()" v-if="taskDetailsData.handleState != 0">
         <template slot-scope="{ row }">{{ row.audit == 'true' ? '合格' : '不合格' }}</template>
      </el-table-column>
 </el-table>

②

<el-table ref="multipleTable" :data="tableData.slice((currentPage - 1) * pageSize, currentPage * pageSize )  " tooltip-effect="dark" style="width: 100%" :row-key=" (row) => { return row.id;  }  " @selection-change="handleSelectionChange">
      <el-table-column :key="0" v-if="taskDetailsData.handleState == 0"   type="selection" align="center" width="55">
       </el-table-column>
      <el-table-column label="缩略图" :key="1">
            <template slot-scope="{ row }">
              <img v-show="row.type == 'image'" class="tableImg" :src="row.img" alt="没有图片" />
            </template>
      </el-table-column>
      <el-table-column label="素材是否合格" :key="2" v-if="taskDetailsData.handleState != 0">
         <template slot-scope="{ row }">{{ row.audit == 'true' ? '合格' : '不合格' }}</template>
      </el-table-column>
 </el-table>

总结：
其实两种方法都是给所有列加了key值
第一种方法好在key值是随机数，添加列或者修改列顺序时,写上:key=Math.random()就行，但是渲染时列表会出现一瞬间的晃动
第二种不会出现晃动的瑕疵，但是修改key值麻烦