//官方的例子
#include <iostream>
#include <nlohmann/json.hpp>using json = nlohmann::json;int main()
{// create JSON valuesjson j_object = {{"one", 1}, {"two", 2}};json j_array = {1, 2, 4, 8, 16};// example for an objectfor (auto& x : j_object.items()){std::cout << "key: " << x.key() << ", value: " << x.value() << '\n';}// example for an arrayfor (auto& x : j_array.items()){std::cout << "key: " << x.key() << ", value: " << x.value() << '\n';}
}

编译运行输出：

key: one, value: 1
key: two, value: 2
key: 0, value: 1
key: 1, value: 2
key: 2, value: 4
key: 3, value: 8
key: 4, value: 16 

可以看到对于object可以通过key()和value()拿到键值对

对