let a = [{"key":[{"id":1,"value":'a'},{"id":3,"value":'b'}]},{"key":[{"id":2,"value":'aa'},{"id":4,"value":'bb'}]}];
let b = [{"index":1,"value":'va1'},{"index":2,"value":'va2'}];
如果a中id在b中的index 不存在,需要添加一个{"index":id值,"value":和id同级的value值}
期望数据
let c = [{"index":1,"value":'va1'},{"index":2,"value":'va2'},{"index":3,"value":'b'},{"index":4,"value":'bb'}];
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