What does nodejs do? What functions

Modern web applications have come a long way over the years with the launch of many popular frameworks such as bootstrap, Angular JS, etc., all of which are based on popular JavaScript frameworks. However, there is only one void when developing server-based applications, and this is where Node.js comes into the picture.

Node.js is also based on JavaScript framework, but it is used for developing server-based applications. Throughout the tutorial, we will cover Node.js in detail and how to use it to develop server-based applications.

1: What is Node.js

Node.js is based on event-driven architecture and non-blocking input/output API, optimizing application throughput and real-time Web Application scalability, the frameworks available for web development are all based on the stateless model, which is a situation where data generated in one session is not used in the next session with that user. A lot of work must be done to maintain session information between user requests. But with Node.js, there is finally a way to have web applications with real-time two-way connections, where both the client and the server can initiate communication, allowing them to freely exchange data.

2: What does nodejs do? Features of Node.js

Asynchronous event-driven IO facilitates concurrent request handling - this is probably the biggest selling point of Node.js. This feature basically means that if Node receives a request for a certain input/output operation, it will perform that operation in the background and continue processing other requests.

This is very different from other programming languages. The code below gives a simple example

var fs = require（'fs'）; 
          fs.readFile（ “Sample.txt的”，功能（错误，数据）
          {
                console.log（“读取数据已完成”）;
     });

The above code reads a file named Sample.txt. In other programming languages, the next line processing will only happen after the entire file is read.

But in the case of Node.js, the important part of the code to pay attention to is the declaration of the function ('function(error, data)'), which is called the callback function.

So what happens here is that the file read operation will start in the background. And other processing can be performed simultaneously while reading the file. Once the file read operation is complete, this anonymous function is called and the text "Read data completed" is written to the console log.

Node uses the V8 JavaScript Runtime engine, which is the engine used by Google Chrome. Node has a wrapper on the JavaScript engine, making the runtime engine faster and of course request processing within Node also becomes faster.

Handling of concurrent requests, another key feature of Node is the ability to handle concurrent connections on a single process with minimal overhead.

The Node.js library uses JavaScript, which is another important aspect of development in Node.js. A major section of the development community is already proficient in javascript, so developing in Node.js becomes easier for developers who know javascript.

The Node.js framework has an active and vibrant community. Thanks to the active community, key updates are always available for the framework. This helps to keep the framework up to date with the latest trends in web development.

Three: Uses of Node.js

1.Node.js is most suitable for use in streaming applications, as well as some chat applications.

2. Game Server - This is an ideal framework for fast and high-performance servers that need to handle thousands of requests at a time.

3. Ad Server - Again here you can have thousands of requests pulling ads from a central server, Node.js can be an ideal framework to handle this.

4. Streaming Server - Another ideal scenario for using Node is for a multimedia streaming server, where clients have requests to pull different multimedia content from the server.

The above is what does nodejs do? All the functions are introduced. If you want to know more about Node.js video tutorial, please pay attention to the php Chinese website.

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