How Nodejs Work?

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Talat Hussain

Talat Hussain

Reactjs | Nodejs | Expressjs | Nestjs| Socketio | Gsap | Three.js| As a web developer, my goal is to create a customized, beautiful website that meets the client's needs and reflects their brand identity

发布日期: 2023年3月25日

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1. First, Node.js reads and parses the JavaScript code written by the developer.
2. When Node.js encounters an asynchronous operation, such as reading data from a file or making a network request, it sends that operation to the operating system's kernel to be executed asynchronously.
3. While the asynchronous operation is being executed, Node.js continues to run other code in the program instead of blocking the entire program until the operation is complete.
4. Once the asynchronous operation is complete, Node.js adds the result to an event queue to be processed later.
5. Node.js then enters the event loop, which constantly checks the event queue for new events to process.
6. If there are any events in the queue, the event loop will execute the associated callback function, which was defined by the developer when the asynchronous operation was initiated.
7. The event loop will continue to process events until the queue is empty or the program is terminated.
8. During all of this, Node.js uses a single-threaded model to handle multiple simultaneous connections efficiently by using non-blocking I/O and the event loop.

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