1.如果使用的是系统自带的

static Label* createWithSystemFont ( const std::string & text,
        const std::string & font,
        float fontSize,
        const Size & dimensions = Size::ZERO,
        TextHAlignment hAlignment = TextHAlignment::LEFT,
        TextVAlignment vAlignment = TextVAlignment::TOP
)

auto labelscore = Label::createWithSystemFont(score, "Arial", 72);

2.如果是使用的是自己下载来的字体

static Label* createWithTTF ( const std::string & text,
　　const std::string & fontFilePath,
　　float fontSize,
　　const Size & dimensions = Size::ZERO,
　　TextHAlignment hAlignment = TextHAlignment::LEFT,
　　TextVAlignment vAlignment = TextVAlignment::TOP
) 

auto labelscore = Label::createWithTTF(score, "fonts/Marker Felt.ttf", 36);

关于Cocos2d-x中字体的使用