Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "how to install the Node.js environment". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

What is Node?

The previous article talked about the comparison between Node.js and java as a background server, generally speaking, each has its own advantages and disadvantages, so what exactly is Node.js? In fact, we went to visit the Node.js Chinese website, which gave the answer we wanted:

1.Node.js is a JavaScript runtime environment based on the Chrome V8 engine.

2.Node.js uses an event-driven, non-blocking Istroke O model

3. It is lightweight and efficient.

As we said in the previous article, Node.js is a runtime environment, neither a programming language nor a framework, but a js runtime environment based on the V8 engine. There is no BOM and DOM in nodejs, which is in the browser runtime environment. Nodejs only contains Ecmascript (variables, arrays, methods, objects, functions, etc.) in JavaScript, as well as some of its own core modules, which enable node.js to do server programming, such as http modules. Fs file module. Node.js is single-threaded, but its asynchronous programming makes it very efficient. Perhaps now you can not quite understand these three characteristics of Node, but with further study will slowly understand.

Why learn Node?

So next, everyone is bound to ask why Nodejs is used.

In fact, in my opinion, there are four advantages to using Node,js as a backend:

1. Node.js is based on the Javascript language, so you don't have to learn a new language alone, thus reducing the threshold for learning. Javascript language is very important in the front-end development of Web, especially the application of HTML5 must be used, so the unified language of front and background can not only realize the full stack development of programmers, but also unify the common class library and standardize the code. With that alone, Node. Js has won the favor of the market.

2. Nodejs chooses the fastest browser kernel V8 as the execution engine to ensure the performance and stability of Node.js.

3. Because Node.js uses single threading, performance is very efficient. Another feature of Nodejs, asynchronous programming, gives Nodejs a clear advantage in dealing with IO-intensive applications.

4. The community of Nodejs is growing, not only the number of packages is increasing rapidly, but also the quality of packages is significantly better than that of other languages.

Areas where Node is not suitable

Because Node.js uses a single-threaded mechanism, the least good area for Node.js is the programming operation of CPU and memory.

1. Computing-intensive applications, we can not let Javascript and write the underlying C to compete for computing performance.

two。 Memory control, which makes Javascript and Java more complex data type definitions, is also difficult.

3. For the application of large memory, due to the limitation of memory design of V8 engine, the maximum heap in 32-bit environment is about 700m, and the maximum heap in 64-bit environment is less than 1.5. it is also difficult for Node.js to read large memory.

4. No asynchronous applications: one of the remarkable features of Node.js is that it can be programmed asynchronously, and it is more suitable for applications that do not need asynchronous applications such as Java.

NodeJS installation

We visit Node.js 's official website: https://nodejs.org/en/

We download the latest version on the right directly, and next does not know the end of finish during installation, because the latest version of node.js will add environment variables to path by default, so you can test whether the environment is installed successfully in cmd.

1. First test whether Node.js is installed successfully. Type node-v into cmd to test.

two。 Since the new version of nodejs has been integrated with npm, npm is also installed. You can also use the cmd command line to type "npm-v" to test whether the installation is successful.

At this point, we successfully installed Node.js.

That's all for "how to install the Node.js environment". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.