//数据结构可参考饿了么UItreeData: [{id: 1,label: 'Level one 1',type: 1,children: [{id: 4,label: 'Level two 1-1',type: 2,children: [{id: 9,label: 'Level three 1-1-1',type: 3}, {id: 10,label: 'Level three 1-1-2',type: 3}]}, {id: 11,label: 'Level three 1-2',type: 2,children: [{id: 12,label: 'Level three 1-2-1',type: 3}, {id: 13,label: 'Level three 1-2-2',type: 3}, {id: 14,label: 'Level three 1-2-3',type: 3}, {id: 15,label: 'Level three 1-2-4',type: 3}]}]}]

//转结构（list就是你要转的树状数据）treeToList(list) {let res = []for (const item of list) {const { children, ...i } = itemif (children && children.length) {res = res.concat(this.treeToList(children))}res.push(i)}return res}
//查看数据是否转换成功const treeList = this.treeToList(this.treeData)console.log('树状结构转扁平结构', treeList)   

参考文档Vue tree树状结构数据转扁平数据_vue树形结构转化为平行结构-CSDN博客