NodeJS

The difference between the methods or attributes used to represent paths, such as __dirname , __filename , etc. in NodeJS

• __dirname The absolute path of the current file, which will not change with the directory where the command is executed
• __filename The absolute path of the current file, which will not change with the directory where the command is executed
• module.filename The absolute path of the current file, which will not change with the directory where the command is executed
• The working directory path of process.cwd() running the current script will change with the directory when executing the script
• process.chdir() changes the working directory

For example, there is a project named test under /home/wsl :

 test└── parent └── child └── app.js

The content of the app.js file is as follows:

 console.log(__dirname)console.log(__filename)console.log(module.filename)console.log(module.filename === __filename)console.log(process.cwd())process.chdir('/home/wsl')console.log(process.cwd())

Then execute node parent/child/app.js in the test directory, and the output is as follows:

 /home/wsl/test/parent/child/home/wsl/test/parent/child/app.js/home/wsl/test/parent/child/app.jstrue/home/wsl/test/home/wsl

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