js数据合并问题

Question

根据key合并a和b的数据得到result，代码怎么写性能好？要考虑实际数据比这个多几层嵌套。consta=[{key:"id",num:"111",},{key:"age",num:"222",}];constb=[{key:"age",initVal:"23"},{key:"id",initVal:"001"}];constresult=[{key:"id",initVal:"001",num:"111",},{key:"age",initVal:"23",num:"222",}];