可以以电脑浏览器的手机模式打开，也可以在手机浏览器中直接打开
游戏运用了Canvas的drawImage，translate，rotate，save，restore，fillRect等API。 采用中介者模式，Game类统领全局，负责读取资源，设置定时器，维护各个物体实例，所有的演员都是Game类new 出来的， 游戏项目外部的语句就一条：
- 碰撞检测
因此小鸟的图片其实是一个长方形，而且角度又不断变化导致中心点难于掌握，因此很难判断小鸟与管子的碰撞。 这里画了张图帮助自己理解
- 小鸟下落的速度
需要模拟小鸟的重力，高中物理没有白学
- 分数的计算
分数的计算与碰撞检测类似，设置一个开关，当管子重新出现时，设置为true。当分值加1时，设置为false。小鸟的最左边的x坐标如果超出了管子的x+width，就认为成功通过。
- 场景管理器
场景管理器有4个方法enter,update,render，bindEvent。其中定时器在每帧执行update方法和render方法。enter方法由业务来调用，比如用户点击了按钮，此时就进入场景2，鸟撞到了管子，就进入场景3。 这样就把游戏的各个不同阶段分离出来，方便处理。
演示下载地址：https://www.erdangjiade.com/js/7968.html
源码实例如下：
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