根据某一字段的值进行分类重组
源数据:
var _arr = [{ aId: 1, bId: 11, cId: 112,
}, { aId: 1, bId: 11, cId: 113,
}, { aId: 1, bId: 12, cId: 114,
}, { aId: 2, bId: 21, cId: 211,
}]期望:
[{
aId: 1,
children: [{
bId: 11,
children: [{
cId: 112
}, {
cId: 113
}]
}, {
bId: 12,
children: [{
cId: 114
}]
}]
}, {
aId: 2,
children: [{
bId: 21,
children: [{
cId: 211
}]
}]
}]
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