行为型模式第二组
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解释器模式：
代码逻辑：
音阶和音符组合（O 2 E 0.5 G 0.5 A 3 E 0.5）
从头开始切割（包含空格），根据字母（case）写出相应的音符（1，2，3，4，5，6，7），根据数字写出相应得音阶（中高低音），重点是切割音符音阶组合的代码
//这一行没有把属性重新赋值，所以PlayText里面是O 2 E 0.5 G 0.5 A，（没有将属性重新赋值） st
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