测试的data.json文件的内容如下：

[{"name":"zhangsan","age":20},{"name":"lisi","age":30}]

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

USING_NS_CC;


class HelloWorld : public cocos2d::Layer
{
public:
    static cocos2d::Scene* createScene();

    virtual bool init();

	void readJsonByCocosAPI();

    CREATE_FUNC(HelloWorld);

private:
	LabelTTF *pLabel;
};

#endif // __HELLOWORLD_SCENE_H__

#include "HelloWorldScene.h"
#include "json/document.h"

Scene* HelloWorld::createScene()
{
    auto scene = Scene::create();
    auto layer = HelloWorld::create();
    scene->addChild(layer);

    return scene;
}

bool HelloWorld::init()
{
    if ( !Layer::init() )
    {
        return false;
    }
    
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

	pLabel = LabelTTF::create("","Arial",30);
	pLabel->setPosition(visibleSize/2.0);
	this->addChild(pLabel);

	this->readJsonByCocosAPI();

    return true;
}

void HelloWorld::readJsonByCocosAPI()
{
	rapidjson::Document doc;
	doc.Parse<0>(FileUtils::getInstance()->getStringFromFile("data.json").c_str());

	// 获得第一个对象的name和age的属性
	int index = 0;
	const char *ch = doc[index]["name"].GetString();
	int iage = doc[index]["age"].GetInt();

	std::ostringstream str;
	str << "name:";
	str << ch;
	str << ",";
	str << "age:";
	str << iage;

	pLabel->setString(str.str());

	// 遍历json数组
	for (int i = 0; i < doc.Size(); i ++)
	{
		const char *name= doc[i]["name"].GetString();
		int age = doc[i]["age"].GetInt();

		log("name:%s,age:%d",name,age);
	}
}