What is Node.js fs

In Node.js, the full name of fs is filesystem, which means "file system" in Chinese and refers to the fs module. The fs module provides the ability to read and write local files, and is basically a simple wrapper for POSIX file operation commands; the fs module provides asynchronous and synchronous operation methods for almost all operations for developers to choose.

Node is a development platform that allows JavaScript to run on the server. It makes JavaScript a scripting language on par with server-side languages ​​such as PHP, Python, Perl, and Ruby. . do you know? The Node.js fs module is the file system.

fs is the abbreviation of filesystem, which translates to file system. This module provides the ability to read and write local files. It is basically a simple wrapper for POSIX file operation commands.

However, This module provides asynchronous and synchronous operation methods for almost all operations for developers to choose.

For example, the functions for reading file contents include asynchronous fs.readFile() and synchronous fs.readFileSync().

The last parameter of the asynchronous method function is the callback function, and the first parameter of the callback function contains error information (error).

It is best to use asynchronous methods. Compared with synchronization, asynchronous methods have higher performance, faster speed, and no blocking (key point).

For servers with large traffic, it is best to use asynchronous operations. During synchronous operations, the next operation will not start until the previous operation ends. If an operation is particularly time-consuming (which often happens When reading and writing data), it will cause the entire program to pause.

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