模块缓存的注意事项

模块根据其解析的文件名进行缓存。 由于模块可能会根据调用模块的位置（从 node_modules 文件夹加载）解析为不同的文件名，因此如果 require('foo') 解析为不同的文件，则不能保证 require('foo') 将始终返回完全相同的对象。

此外，在不区分大小写的文件系统或操作系统上，不同的解析文件名可以指向同一个文件，但缓存仍会将它们视为不同的模块，并将多次重新加载文件。 例如，require('./foo') 和 require('./FOO') 返回两个不同的对象，而不管 ./foo 和 ./FOO 是否是同一个文件。

Modules are cached based on their resolved filename. Since modules may resolve to a different filename based on the location of the calling module (loading from node_modules folders), it is not a guarantee that require('foo') will always return the exact same object, if it would resolve to different files.

Additionally, on case-insensitive file systems or operating systems, different resolved filenames can point to the same file, but the cache will still treat them as different modules and will reload the file multiple times. For example, require('./foo') and require('./FOO') return two different objects, irrespective of whether or not ./foo and ./FOO are the same file.