brew中字符串的操作，包括字符串的连接，查找，复制等等，多中操作方式，体现应用不同接口函数，产生的不同效果，适合初学者。-brew of string operations, including the connection string, search, copy, and so on, more of operational modes, demonstration that the application of different interface function of the different effects, for beginners.