vue 表格循环多级表头

<el-table v-loading="loading"  :data="infoList" show-summary>
	<el-table-column v-for="column in columns" :key="column.prop" :label="column.label" :prop="column.prop">
    	<el-table-column v-for="(item,index) in column.list" :key="index" :label="item.label" :prop="item.prop">
        </el-table-column>
    </el-table-column>
</el-table>

数据格式

tableData: [
	{ 
	 institution: '石家庄',
	 entrynum:'111',
	 premium:'201',
     list:[
        {entrynum:'11',premium:'200',}
     ]
    },
],
columns: [
	{ label: '机构', prop: 'institution' },
    { label: '健康险(风险型)',
       list:[
          {label: '项目数', prop: 'entrynum' },
          {label: '保费规模', prop: 'premium' }
       ]
    },
    { label: '健康险(服务型)',
        list:[
          {label: '项目数', prop: 'entrynum' },
          {label: '保费规模', prop: 'premium' }
        ]
     },
     { label: '意外险',
         list:[
            {label: '项目数', prop: 'entrynum' },
            {label: '保费规模', prop: 'premium' }
         ]
     },
     { label: '意健险',
         list:[
           {label: '项目数', prop: 'entrynum' },
           {label: '保费规模', prop: 'premium' }
         ]
     }
],