一个简单的动画FPS

public float CalFPS()
    {
        ++FPS_frames;
        
        float timeNow = Time.realtimeSinceStartup;
        
        if (timeNow > FPS_lastInterval + FPS_updateInterval) 
        {
            FPS_fps = (float)(FPS_frames / (timeNow - FPS_lastInterval));
            
            FPS_frames = 0;
            
            FPS_lastInterval = timeNow;
        }
        
        return FPS_fps;
    }