TQ2440利用蜂鸣器唱歌 特点：大家对照着乐谱将自己喜欢的歌曲按照作者写的规则（很简洁的），一个个的音符写进一个数组里面就可以自定义自己喜欢的歌曲了 -TQ2440 use the buzzer to sing features: music to everyone according to their favorite songs written by the author in accordance with the rules (very simple), one of th