It is recommended for web developers to understand this language and get good command over it. For using core JS you don’t need any libraries just put your code inside the script tag. See Example Below
Less server interaction − You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.
Immediate feedback to the visitors − They don’t have to wait for a page reload to see if there is an error in the form input.
Increased interactivity− You can create interfaces that react when the user hovers over them with a mouse or activates them via click event.
Richer interfaces − JS gives a nice interface to users by allowing you to add sliders, drag and drop, tabs, validation etc.
It lacks in multithreading or multiprocessor capabilities
It has security issues
Frameworks describe a given structure of “how” you should present your code. Pretty much like a code-template.
Libraries are like a toolkit that aid you in various tasks
Frameworks and Libraries…
2)Meteor Js – Meteor Js is open-source Js Framework written in node js, it requires jQuery library or Js UI library to run. Meteor allows for rapid prototyping and produces cross-platform (Android, IOS, Web) code
7)jQuery – It is a library which offers good features which makes java script rich. It makes HTML page richer and user-friendly with event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.
10)Ionic Js – Build mobile apps with the web tech you know. It is an open-source, Cross-Platform.