el-table树形表格的多选框

树形表格加复选框后，选中父节点后子节点不自动选中的问题。于是在table上监听点击和全选，根据数据有子节点来手动切换选中与否。

template如下

data如下:

       tableData: [{
          id: 1,
          date: '2016-05-01',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1518 弄'
        }, {
          id: 2,
          date: '2016-05-02',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1517 弄'
        }, {
          id: 3,
          date: '2016-05-03',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1519 弄',
          children: [{
              id: 31,
              date: '2016-05-31',
              name: '王小虎',
              address: '上海市普陀区金沙江路 1519 弄'
            }, {
              id: 32,
              date: '2016-05-32',
              name: '王小虎',
              address: '上海市普陀区金沙江路 1519 弄'
          }]
        }, {
          id: 4,
          date: '2016-05-04',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1516 弄',
          children: [{
              id: 41,
              date: '2016-05-31',
              name: '王小虎',
              address: '上海市普陀区金沙江路 1519 弄'
            }, {
              id: 42,
              date: '2016-05-32',
              name: '王小虎',
              address: '上海市普陀区金沙江路 1519 弄'
          }]
        }],
      selectArr: []
    }

methods方法如下:

select(selection, row){if(selection.some(el=>{return row.id === el.id })){if(row.children){
          row.children.map(j=>{this.toggleSelection(j,true)})}}else{if(row.children){
          row.children.map(j=>{this.toggleSelection(j,false)})}}},selectAll(selection){// tabledata第一层只要有在selection里面就是全选const isSelect = selection.some(el=>{const tableDataIds =this.tableData.map(j=> j.id)return tableDataIds.includes(el.id)})// tableDate第一层只要有不在selection里面就是全不选const isCancel =!this.tableData.every(el=>{const selectIds = selection.map(j=> j.id)return selectIds.includes(el.id)})if(isSelect){
        selection.map(el=>{if(el.children){
            el.children.map(j=>{this.toggleSelection(j,true)})}})}if(isCancel){this.tableData.map(el=>{if(el.children){
            el.children.map(j=>{this.toggleSelection(j,false)})}})}},selectionChange(selection){this.selectArr = selection
      console.log(this.selectArr,'selectArr')},toggleSelection(row, select){if(row){this.$nextTick(()=>{this.$refs.table &&this.$refs.table.toggleRowSelection(row, select)})}},cancelAll(){this.$refs.table.clearSelection()}}