Node.js 文件路径
Every file in the system has a path. On Linux and macOS, a path might look like: /users/joe/file.txt while Windows computers are different, and have a structure such as: C:\users\joe\file.txt
You need to pay attention when using paths in your applications, as this difference must be taken into account.
You include this module in your files using const path = require('path'); and you can start using its methods.
Getting information out of a path
Given a path, you can extract information out of it using those methods:
dirname: get the parent folder of a filebasename: get the filename partextname: get the file extension
Example
JS
You can get the file name without the extension by specifying a second argument to basename:
JS
Working with paths
You can join two or more parts of a path by using path.join():
JS
You can get the absolute path calculation of a relative path using path.resolve():
JS
In this case Node.js will simply append /joe.txt to the current working directory. If you specify a second parameter folder, resolve will use the first as a base for the second:
JS
If the first parameter starts with a slash, that means it's an absolute path:
JS
path.normalize() is another useful function, that will try and calculate the actual path, when it contains relative specifiers like . or .., or double slashes:
JS
Neither resolve nor normalize will check if the path exists. They just calculate a path based on the information they got.