What are the advantages of nodejs

Advantages of nodejs: 1. Nodejs syntax is completely js syntax. As long as you understand the basics of js, you can learn Nodejs back-end development; 2. It has higher performance in handling high-concurrency scenarios; 3. It can realize high-performance servers; 4 , short development cycle, low development cost, and low learning cost.

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

Node.js is a javascript running environment. It allows JavaScript to develop back-end programs and achieve almost all functions implemented by other back-end languages, and can be on an equal footing with back-end languages ​​such as PHP, Java, Python, .NET, and Ruby.

Nodejs is based on the V8 engine. V8 is an open source JavaScript engine released by Google. It is the js interpretation part for the Chrome browser. But Ryan Dahl, a guy like a genius, moved this V8 to the server. , software used to make servers.

What are the advantages of nodejs

#1. Nodejs syntax is completely js syntax. As long as you understand the basics of js, you can learn Nodejs. Terminal development

Node breaks the past situation where JavaScript can only run in the browser. The unified front-end and back-end programming environments can greatly reduce development costs.

2. NodeJs has super high concurrency capabilities and has higher performance in handling high concurrency scenarios.

The primary goal of NodeJs is to provide a simple method for creating high-concurrency scenarios. Performance server and development tools for various applications that can run in the server.

First let us take a look at what problems exist in current server-side languages. In server languages ​​such as Java, PHP or .NET, a new thread is created for each client connection. Each thread requires approximately 2MB of memory. In other words, theoretically, the maximum number of users that can be connected to a server with 8GB of memory at the same time is about 4,000. In order for a web application to support more users, the number of servers needs to be increased, and of course the hardware cost of the web application increases.

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

3. Implementing high-performance servers

Strictly speaking, Node.js is a development tool used to develop various web servers. In the Node.js server, the high-performance V8 JavaScript scripting language is running, which is a scripting language that can run on the server side.

So, what is the V8 JavaScript scripting language? This language is a scripting language that is parsed and executed by the V8 JavaScript engine. The V8 JavaScript engine is a high-performance JavaScript engine developed by Google using the C language. The engine is not limited to running in the browser. Node.js transfers this to the server and provides it with many additional APIs for various purposes. For example, in a server, it is often necessary to process various binary data. In the JavaScript scripting language, there is only very limited processing capability for binary data, while the Buffer class provided by Node.js provides rich processing capabilities for binary data.

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

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

Node.js’ own philosophy is to minimize hardware costs and pursue higher concurrency. Higher processing performance.

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