vue项目中如何使用iview 隐藏Table组件里的列

columns: [
{
 type: 'selection',
 width: 60,
 align: 'center'
},
{
 title: '账号ID',
 key: 'accountIdString'
},
{
 title: '账号名称',
 key: 'accountName'
},
{
 title: '账户组名称',
 key: 'accountGroupName'
}]

if(this.queryCostComparisonData[i].accountGroupName){
 this.columns = this.columns.filter(col => col.key !== 'accountIdString' );
 this.columns = this.columns.filter(col => col.key !== 'accountName' );
 }else{
 this.columns = this.columns.filter(col => col.key !== 'accountGroupName' );
 }

<el-table :data="list" border fit @header-contextmenu="contextmenu">
 <el-table-column v-if="colData[0].istrue" label="放射源ID" align="center" />
 <el-table-column v-if="colData[1].istrue" label="源自编号" align="center" />
 <el-table-column v-if="colData[2].istrue" label="类型" align="center" />
 <el-table-column v-if="colData[3].istrue" label="强度" align="center" />
 <el-table-column v-if="colData[4].istrue" label="还源人" align="center" />
</el-table>
<!--右键弹出的菜单内容-->
<!--动态计算菜单出现的位置-->
<div v-show="menuVisible" : class="menu1">
 <el-checkbox-group v-model="colOptions">
 <el-checkbox v-for="item in colSelect" :key="item" :label="item" />
 </el-checkbox-group>
</div>

data() {
 return{
 menuVisible: false, //右键菜单的显示与隐藏
 top: 0, //右键菜单的位置
 left: 0,
 colOptions: ['放射源ID', '源自编号', '类型', '强度', '还源人'], //多选框的选择项
 colSelect: ['放射源ID', '源自编号', '类型', '强度', '还源人'], //多选框已选择的内容，即表格中显示的列
 // istrue属性存放列的状态
 colData: [
 { title: '放射源ID', istrue: true },
 { title: '源自编号', istrue: true },
 { title: '类型', istrue: true },
 { title: '强度', istrue: true },
 { title: '还源人', istrue: true }
 ]
 }
}

<script>
watch: {
 colOptions(newVal, oldVal) {
 if (newVal) { //如果有值发生变化，即多选框的已选项变化
 var arr = this.colSelect.filter(i => newVal.indexOf(i) < 0) // 未选中
 this.colData.filter(i => {
  if (arr.indexOf(i.title) !== -1) {
  i.istrue = false
  } else {
  i.istrue = true
  }
 })
 }
 }
 },
 </script>

methods: {
 contextmenu(row, event) {
 //先把菜单关闭，目的是第二次或者第n次右键鼠标的时候 它默认的是true
 this.menuVisible = false 
 // 显示菜单
 this.menuVisible = true 
 window.event.returnValue = false //阻止浏览器自带的右键菜单弹出
 //给整个document绑定click监听事件， 左键单击任何位置执行foo方法
 document.addEventListener('click', this.foo) 
 //event对应的是鼠标事件，找到鼠标点击位置的坐标，给菜单定位
 this.top = event.clientY
 this.left = event.clientX
 },
 foo() {
 this.menuVisible = false //关闭菜单栏
 document.removeEventListener('click', this.foo) //解绑click监听，很重要，具体原因可以看另外一篇博文
 }
 }

.menu1{
 position:fixed;
 height:auto;
 width:231px;
 border-radius: 3px;
 border: 1px solid #999999;
 background-color: #f4f4f4;
 padding: 10px;
 z-index: 1000
}
.el-checkbox{
 display:block;
 height:20px;
 line-height:20px;
 padding:0 5px;
 margin-right:0;
 font-size:12px;
 border: 1px solid transparent;
}
.el-checkbox:hover{
 border-radius: 3px;
 border: 1px solid #999999;
}

<el-table
 border
 :data="list"
 highlight-current-row
 @header-contextmenu="contextmenu"
 >
 <el-table-column
 v-for="(item,index) in tableHeader"
 v-if="colData[index].istrue"
 :key="item.key"
 show-overflow-tooltip
 :label="item.label"
 :prop="item.key"
 >
 <template slot-scope="scope">
  <span v-if="(item.key==='qyrq'||item.key==='ccrq'||item.key==='zcsj')&&scope.row[item.key]">{{ scope.row.qyrq|parseTime() }}</span>
  <span v-else>{{ scope.row[item.key] }} </span>
 </template>
 </el-table-column>
 </el-table>

dara() {
 return{
 tableHeader: [
  { label: '放射源ID', key: 'id' },
  { label: '源自编号', key: 'zbh' },
  { label: '类型', key: 'kind' },
  { label: '强度', key: 'qd' },
  { label: '还源人', key: 'user' },
 ]
 }}