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Lecture Web technology and online services: Lesson 7.2 - Introduction to Node.js

Lecture "Web Technology and online services: Lesson 7.2 - Introduction to Node.js" provide students with knowledge about: Introduction to Node.js; Installation and Example Node.js. Please refer to the detailed content of the lecture! | Introduction to Node.js 1 Content Introduction Installation and Example Introduction 3 Basic Nodejs Node.js is an open-source and cross-platform JavaScript runtime environment Node.js runs the V8 JavaScript engine the core of Google Chrome outside of the browser. This allows Node.js to be very performant. 2009 Node.js was created by Ryan Dahl the first form of npm is created 2011 Larger companies adopting Node.js LinkedIn Uber 2015 The Node.js Foundation is born release Node.js 4 2017 Node.js 8 introduces Node.js in its testing suite officially making Node.js a target for the JS engine 2020 Node.js 14 15 In simple words Node.js is Server-side JavaScript . Node s goal is to provide an easy way to build scalable network programs from nodejs.org Basic Nodejs cont. A Node.js app is run in a single process without creating a new thread for every request. provides a set of asynchronous I O primitives in its standard library that prevent JavaScript code from blocking Non-blocking I O Example Traditional I O Non-traditional non-blocking I O 5 When can Node.js do Generate dynamic page content Create open read write delete close files on server Collect form data Add delete modify data in database Etc. 6 When to use Node.js Node.js is good for creating streaming based real-time services web chat applications static file servers etc. If high level concurrency and not worried about CPU-cycles. If you are great at writing JavaScript code because then you can use the same language at both the places server-side and client-side 7 Installation and Example 8 Installation Node.js can be installed in different ways. Download from Node.js website https nodejs.org en download Installation Node.js can be installed in different ways. On MacOS from CLI On Ubuntu Install Node.js and NPM on Windows Step 1 Download Node.js Installer navigate to https nodejs.org en download . Click the Windows Installer button to download the latest default version. 11 Install Node.js and NPM on Windows Step