条件指定列的隐藏于显示，v-show没有实现，用v-if实现了，虽然vue官网提示：一般来说，v-if 有更高的切换开销，而 v-show 有更高的初始渲染开销。因此，如果需要非常频繁地切换，则使用 v-show 较好；如果在运行时条件很少改变，则使用 v-if 较好。

<el-table-column type="index" label="序号" width="80" align="center"></el-table-column>
<el-table-column prop="workshop" label="车间" align="center" v-if="isshow002"></el-table-column>
<el-table-column prop="workArea" label="工区" align="center" v-if="isshow003"></el-table-column>

 export default{
     data(){
       return {
        isshow002:true,
        isshow003:true
        }
    }
}

 let isShowD = this.userName.indexOf('段');
        console.log(isShowD,'isShowD');
        let isShowC = this.userName.indexOf('车间');
        let isShowW = this.userName.indexOf('工区');
         if(isShowD != -1){
          this.isshow = true;
          this.isshow01 = false;
          this.isshow002 = true;
          this.isshow003 = true;
         }
        if(isShowC != -1){
           this.isshow002 = false;
           this.isshow = true;
           this.isshow01 = false;
           this.isshow003 = true;
        }
        if(isShowW != -1){
          this.isshow = false;
          this.isshow01 = true;
          this.isshow002 = false;
           this.isshow003 = false;
        }