nlohmann json：通过for遍历object和array

object和array可以使用数for进行遍历：

#include <iostream>
#include <nlohmann/json.hpp>
using namespace std;
using json = nlohmann::json;auto checkJsonType(json& x)
{if(x.type() == json::value_t::null){cout<<x<<" is null"<<endl;}else if(x.type() == json::value_t::object){cout<<x<<" is object"<<endl;}else if(x.type() == json::value_t::array){cout<<x<<" is array"<<endl;}else if(x.type() == json::value_t::string){cout<<x<<" is string"<<endl;}else if(x.type() == json::value_t::boolean){cout<<x<<" is boolean"<<endl;}else if(x.type() == json::value_t::number_integer){cout<<x<<" is number_integer"<<en