Quick Answer: What Is JavaScript Class 9?

Is JavaScript front end or backend?

The visual aspects of the website that can be seen and experienced by users are frontend.

On the other hand, everything that happens on the background can be attributed to the backend.

Languages used for front end are HTML, CSS, Javascript while those used for backend include Java, Ruby, Python, .

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Why is JavaScript dangerous?

JavaScript can be dangerous if the proper precautions aren’t taken. It can be used to view or steal personal data even you don’t realize what’s going on. And since JavaScript is so ubiquitous across the web, we’re all vulnerable. … Javascript is called the language of the Web.

How do I know if JavaScript is working?

go to Tools.then Internet Options…select the Security tab.press the Custom Level button.scroll down to Scripting.enable Active Scripting.

Why is JavaScript famous?

In short, JavaScript became a hit because it turned web browsers into application platforms. Here’s how: JavaScript can be used in both the front-end and back-end of web development. … Chrome, the most used Internet browser in 2017, has been so successful in part because of its ability to process JavaScript quickly.

What are the main features of JavaScript?

Javascript FeaturesLight Weight Scripting language.Dynamic Typing.Object-oriented programming support.Functional Style.Platform Independent.Prototype-based.Interpreted Language.Async Processing.More items…

How does JavaScript work?

JavaScript is what is called a Client-side Scripting Language. … Inside a normal Web page you place some JavaScript code (See How Web Pages Work for details on Web pages). When the browser loads the page, the browser has a built-in interpreter that reads the JavaScript code it finds in the page and runs it.

What is JavaScript and do I need it?

JavaScript is a programming language used primarily by Web browsers to create a dynamic and interactive experience for the user. Most of the functions and applications that make the Internet indispensable to modern life are coded in some form of JavaScript.

What is JavaScript mostly used for?

JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user.

What is this in JavaScript?

The JavaScript this keyword refers to the object it belongs to. … In a function, this refers to the global object. In a function, in strict mode, this is undefined . In an event, this refers to the element that received the event. Methods like call() , and apply() can refer this to any object.

What is JavaScript and its types?

JavaScript has six primitives types: string , number , undefined , null , boolean , and symbol . There is also a compound type or object . Interestingly, the primitive types are immutable and don’t have properties. For example, because of the String object you can retrieve the length of a string.

What are the six JavaScript data types?

In JavaScript, there are 6 primitive data types: string, number, boolean, null, undefined, symbol (new in ECMAScript 2015).

What is JavaScript define with example?

JavaScript is a programming language commonly used in web development. It was originally developed by Netscape as a means to add dynamic and interactive elements to websites. … Like server-side scripting languages, such as PHP and ASP, JavaScript code can be inserted anywhere within the HTML of a webpage.