简单来说，foo 就是习惯性用来做示例的类名或者函数方法名，指代一个没有特定意义的实体。就像我们想拿人举例子，总要先起个名字，然后就喜欢用什么“张三”，“李四”之类的。
关于 foo 的起源，通常的解释有：
https://www.techtarget.com/searchapparchitecture/definition/foo-in-software-programming
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