需求是将扁平化的数组转成树形结构,比如:const a = [[1,2,3],['a','b','c'],['A','B','C']];const res = [];要求a数组转化成res是这个样子:[ { label: '1', children: [ { label: 'a', children:[ { label:'A' } ] } ] },{ label: '2', children: [ { label: 'b', children:[ { label:'B' } ] } ] }, { label: '3', children: [ { label: 'c', children:[ { label:'C' } ] } ] },]
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