Cocos2dx:获取系统毫秒时间

class CC_DLL CCTime
{
public:
    static int gettimeofdayCocos2d(struct cc_timeval *tp, void *tzp);
    static double timersubCocos2d(struct cc_timeval *start, struct cc_timeval *end);
};

int getCurrentTime()
{
    struct cc_timeval now;
    CCTime::gettimeofdayCocos2d(&now, NULL);

    return now.tv_sec * 1000 + now.tv_usec / 1000;
}