What does nodejs mean when reading it?

Node.js, pronounced "Node.Jes", is a JavaScript environment running on the server side. It allows developers to use JavaScript on the server side to write high-performance, scalable applications, including web applications, real-time communication applications, command line tools, and more.

Node.js is an open source project created by Ryan Dahl in 2009 to build a web server based on an event-driven, non-blocking I/O model. Its core technology is the V8 engine. V8 is a high-performance JavaScript interpreter developed by Google and is widely used in browsers. Node.js transplants the V8 engine to the server side and provides a rich series of APIs and modules, allowing developers to easily manipulate underlying resources such as files, networks, and operating systems.

Node.js has many features, the most prominent of which is its asynchronous I/O. In a traditional web server, a thread is created for each request and the request is processed in the background. The thread is destroyed when the request ends. This model will lead to server performance degradation in high concurrency situations because the creation and destruction of threads requires a large overhead.

Node.js adopts an event-driven and non-blocking I/O model. When a request comes in, Node.js will package it into an event and then put it in the event queue to wait for processing. When there is an idle processing process, Node.js will take an event from the event queue for processing. During processing, if an I/O operation is encountered, Node.js will hand it over to the background thread for processing, and then continue to execute the next event. In this way, even if the server handles a large number of requests at the same time, it can avoid frequent creation and destruction of threads, thus ensuring the high performance and high concurrency of the server.

In addition to asynchronous I/O, Node.js also has many other advantages. For example, it can be developed using JavaScript language, which means that front-end developers can easily switch to server-side development without learning new languages ​​or technologies, greatly improving development efficiency. In addition, Node.js's package manager NPM is also very powerful. It allows developers to easily download, manage and share code, saving a lot of time and energy.

In short, Node.js is a very easy-to-use server-side development tool. Its asynchronous I/O, lightweight, cross-platform and other characteristics allow developers to develop web applications more efficiently. Command line tools and other server applications. If you haven't tried Node.js yet, you might as well download and install one and experience its powerful features!

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