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This article mainly introduces "what is Node js". In daily operation, I believe many people have doubts about what Node js is. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts about "what is Node js?" Next, please follow the editor to study!

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What is Node.js?

Node.js is a JavaScript runtime environment based on ChromeV8 engine. Node.js uses an event-driven, non-blocking Istroke O model.

Node is a development platform that makes JavaScript run on the server side. It makes JavaScript a scripting language on a par with server-side languages such as PHP, Python, Perl, Ruby and so on. Released in May 2009, developed by RyanDahl, the ChromeV8 engine is essentially encapsulated.

Node optimizes some special use cases to provide an alternative API to make V8 run better in a non-browser environment. The V8 engine executes Javascript very fast and the performance is very good. Node is a platform based on ChromeJavaScript runtime, which is used to build network applications with fast response and easy to expand. Node uses event-driven, non-blocking Istroke O model to make it lightweight and efficient, which is very suitable for running data-intensive real-time applications on distributed devices.

Module of Node.js

Node uses Module modules to divide different functions to simplify application development. The Modules module is a bit like a class library in the C++ language. Each Node class library contains a rich variety of functions, such as http module contains many functions related to http functions, can help developers easily compare such as http,tcp/udp to operate, but also can easily create http and tcp/udp servers.

It is very convenient to use the module in the program, just as follows:

Here, the http class library is introduced, and references to the http class library are stored in the http variable. At this point, Node will search our application to see if there is a directory for node_modules and search for modules for http in that directory. If Node.js cannot find this directory, it will look for it in the global module cache. Users can specify the location of the module through relative or absolute paths, such as:

VarmyModule=require ('. / myModule.js')

The module contains many functional code fragments, and most of the code in the module is private, which means that the function methods and variables defined in the module can only be called in the same module. Of course, some methods and variables can be exposed outside the module, which can be implemented using the exports object.

At this point, the study of "what is Node js" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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