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This article mainly explains "what are the advantages of nodejs". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's ideas to study and learn "what are the advantages of nodejs"?

The advantages of nodejs: 1, Nodejs syntax is completely js syntax, as long as you know the basis of js, you can learn Nodejs back-end development; 2, deal with high concurrency scenarios with higher performance; 3, can achieve high-performance server; 4, short development cycle, low development cost, low learning cost.

The operating environment of this tutorial: windows7 system, nodejs 12.19.0, Dell G3 computer.

Node.js is a javascript runtime environment. It allows javascript to develop back-end programs that implement almost all the functions of other back-end languages, on a par with back-end languages such as PHP, Java, Python, .NET, Ruby, and so on.

Nodejs is based on the V8 engine, which is an open source JavaScript engine released by Google, which itself is the js interpretation part of the Chrome browser, but Ryan Dahl, like a genius, moved the V8 to the server to do the server software.

What are the advantages of nodejs

1. Nodejs syntax is completely js grammar. As long as you know the basics of js, you can learn Nodejs back-end development.

Node breaks the previous situation in which JavaScript could only be run in browsers. The front and back end programming environment is unified, which can greatly reduce the development cost.

2. NodeJs has high concurrency ability and higher performance in dealing with high concurrency scenarios.

The primary goal of NodeJs is to provide a simple development tool for creating high-performance servers and a variety of applications that can run on that server.

First of all, let's take a look at what's wrong with today's server-side languages. In server languages such as Java, PHP, or .NET, a new thread is created for each client connection. Each thread consumes about 2MB memory. In other words, in theory, a server with 8GB memory can connect to a maximum of about 4000 users at the same time. For web applications to support more users, you need to increase the number of servers, and the hardware cost of web applications goes up, of course.

NodeJs does not create a new thread for each customer connection, but uses only one thread. When a user is connected, an internal event is triggered, and the Node.js program is macroscopically parallel through non-blocking I _ paw O and event-driven mechanism. Using Node.js, a server with 8GB memory, can handle more than 40, 000 connections at the same time.

3. Implement high-performance server

Strictly speaking, Node.js is a development tool for developing a variety of web servers. In the Node.js server, you are running the high-performance V8 JavaScript scripting language, which is a scripting language that can run on the server side.

So, what is the V8 JavaScript scripting language? The language is a scripting language parsed and executed by the V8 JavaScript engine. V8 JavaScript engine is a high-performance JavaScript engine developed by Google using C++ language, which is not limited to running in browsers. Node.js transferred it to the server and provided it with a number of additional API for a variety of different purposes. For example, in a server, you often need to deal with all kinds of binary data. In the JavaScript scripting language, it only has a very limited ability to process binary data, while the Buffer class provided by Node.js provides a rich ability to deal with binary data.

In addition, a new compilation technique is used inside the V8 JavaScript engine. This means that the high-end JavaScript script code written by developers is very similar to the low-end C language written by developers, which is also an important feature that Node.js servers can provide.

4. Short development cycle, low development cost and low learning cost.

Node.js 's own philosophy is the lowest hardware cost, the pursuit of higher concurrency and higher processing performance.

Thank you for your reading, the above is the content of "what are the advantages of nodejs". After the study of this article, I believe you have a deeper understanding of what the advantages of nodejs are, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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