可以直接赋值一个容器对象
js[‘xx’]=vec;

#include "json.hpp"
using json=nlohmann::json;
#include <iostream>
#include <vector>
#include <map>
using namespace std;

//json序列化示例1
void func1(){
    json js;
    js["msg_type"]=2;
    js["from"]="zhang san";
    js["to"]="li si";
    js["msg"]="hello,what are you doing now?";

    cout<<js<<endl;
}

int main(){
    func1();

    return 0;
}

转成字符串，就可以通过网络发送

#include "json.hpp"
using json=nlohmann::json;
#include <iostream>
#include <vector>
#include <map>
#include <string>
using namespace std;


//json序列化示例1
void func1(){
    json js;
    js["msg_type"]=2;
    js["from"]="zhang san";
    js["to"]="li si";
    js["msg"]="hello,what are you doing now?";

    string sendBuf=js.dump();
    cout<<sendBuf.c_str()<<endl;
}

int main(){
    func1();

    return 0;
}

还可以放数组，json形式还可以像是二维数组一样，键值对里面套键值对

#include "json.hpp"
using json=nlohmann::json;
#include <iostream>
#include <vector>
#include <map>
#include <string>
using namespace std;


//json序列化示例1
void func1(){
    json js;
    js["id"]={1,2,3,4,5};
    js["msg_type"]=2;
    js["from"]="zhang san";
    js["to"]="li si";
    js["msg"]["zhang san"]="hello world";
    js["msg"]["liu shuo"]="hello china";


    cout<<js<<endl;
}

int main(){
    func1();

    return 0;
}