我觉得这意味着什么都没有。维基上说:

Foo通常与元异步变量bar和foobar一起使用。

“Foo”的定义有很多含义:

bar, and baz are often compounded together to make such words as foobar, barbaz, and foobaz. www.nationmaster.com/encyclopedia/Metasyntactic-variable Major concepts in CML, usually mapped directly onto XMLElements (to be discussed later). wwmm.ch.cam.ac.uk/blogs/cml/ Measurement of the total quantity of pasture in a paddock, expressed in kilograms of pasture dry matter per hectare (kg DM/ha) www.lifetimewool.com.au/glossary.aspx Forward Observation Officer. An artillery officer who remained with infantry and tank battalions to set up observation posts in the front lines from which to observe enemy positions and radio the coordinates of targets to the guns further in the rear. members.fortunecity.com/lniven/definition.htm is the first metasyntactic variable commonly used. It is sometimes combined with bar to make foobar. This suggests that foo may have originated with the World War II slang term fubar, as an acronym for fucked/fouled up beyond all recognition, although the Jargon File makes a pretty good case ... explanation-guide.info/meaning/Metasyntactic-variable.html Foo is a metasyntactic variable used heavily in computer science to represent concepts abstractly and can be used to represent any part of a ... en.wikipedia.org/wiki/FOo Foo is the world of dreams (no its not) in Obert Skye's Leven Thumps series. Although it has many original inhabitants, most of its current dwellers are from Reality, and are known as nits. ... en.wikipedia.org/wiki/Foo (place) Also foo’. Representation of fool (foolish person), in a Mr. T accent en.wiktionary.org/wiki/foo

资源:谷歌

参见RFC 3092:“Foo”的词源，D. Eastlake 3rd等。

为简洁起见，只引用RFC中的相关定义:

通常用作任何事物的示例名称，尤指 程序和文件(特别是草稿文件)。

中使用的元异步变量的标准列表中的第一个 语法示例(bar, baz, qux, quux, corge, grault, garply， 沃尔多，弗雷德，噗，xyzzy，砰)。(术语)

在我的同事中，术语“foo”的含义(或者更准确地说是使用)是作为一个占位符来代表一个名称的示例。例子包括，但不限于，yourVariableName, youobjectname，或yourColumnName。

今天，由于几个原因，我避免使用“foo”，而更喜欢使用这种类型的命名替换。

在我早年的时候，我最初发现在任何例子中使用“foo”作为一个位置来表示f' up的东西是令人困惑的。我想要一个实际的例子，而不是一些无聊的东西。 你的结果可能会有所不同，但我总是，100%，每次，从来没有失败，得到更多关于使用“foo”的实际变量的含义的后续问题。

它是一个元异步变量。

我觉得这意味着什么都没有。维基上说:

Foo通常与元异步变量bar和foobar一起使用。