ElementUI的table默认勾选

// data中有两个值：docList表示table的数据源，docSelection表示默认勾选项，docTable是表格的ref
data () {
    return {
    	docList: [
    	{
	        name: '刘大',
	        nameId: 1,
	        deptname: '内科',
	        level: '主任医生'
	      },
	      {
	        name: '刘二',
	        nameId: 2,
	        deptname: '内科',
	        level: '主任医生'
	      },
	      {
	        name: '刘三',
	        nameId: 3,
	        deptname: '内科',
	        level: '主任医生'
	      },
	      {
	        name: '刘四',
	        nameId: 4,
	        deptname: '内科',
	        level: '主任医生'
	      },
	      {
	        name: '刘五',
	        nameId: 5,
	        deptname: '内科',
	        level: '主任医生'
	      }] ,
	      docSelection: [
	        {
	          name: '刘二',
	          nameId: 2,
	          deptname: '内科',
	          level: '主任医生'
	        },
	        {
	          name: '刘四',
	          nameId: 4,
	          deptname: '内科',
	          level: '主任医生'
	        }]
      }
  }
mounted () {
     let arr = []
     this.docList.forEach(item => {
        this.docSelection.forEach(val => {
          if (val.nameId === item.nameId) {
            arr.push(item)
          }
        })
      })
      this.toggleSelection(arr)  
   }
methods: {
	toggleSelection (rows) {
      if (rows) {
        rows.forEach(row => {
          this.$refs.docTable.toggleRowSelection(row)
        })
      } else {
        this.$refs.docTable.clearSelection()
      }
 }