💻 Computer Science · Topic 47 of 97

Introduction to JavaScript

JavaScript is a programming language that makes web pages interactive by responding to user actions.

▶ Interact

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JavaScript is a programming language that makes web pages interactive by responding to user actions.

  • Runs in the browser
  • Changes page content dynamically
  • Handles events like clicks

🧠 Quick quiz

Three questions. Score 2 or more to complete the topic.

What is Introduction to JavaScript?

Within Computer Science, which covers algorithms, programming, data, networks, hardware and safe, responsible use of technology, this topic explains Introduction to JavaScript. Computing topics explain how software, hardware and data work, with diagrams and models that show each step in order.

Check that you can explain Introduction to JavaScript in your own words and give one example from everyday life. If you can do that, you have understood the core idea.

Understanding Introduction to JavaScript helps you design, test and explain programs, websites and systems, from small projects to exam questions.

Introduction to JavaScript in detail

JavaScript is a programming language that makes web pages interactive. It runs in the browser and can respond to events such as clicks, change page content, validate forms, animate elements and fetch data. It has variables, functions, loops, conditionals and objects.

It works with the DOM (Document Object Model), the browser's representation of the HTML page, to find and change elements, such as document.getElementById("demo").innerHTML = "Hello". Along with HTML and CSS, it is one of the three core web technologies. With Node.js it can also run on servers. Despite the name, it is unrelated to Java.

How the interactive helps you understand Introduction to JavaScript

Click a step, or use the Previous and Next buttons, to move through the sequence one stage at a time. Auto-play moves on for you.

Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Introduction to JavaScript.

Real-life uses and examples

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Frequently asked questions about Introduction to JavaScript

What is Introduction to JavaScript?

JavaScript is a programming language that makes web pages interactive by responding to user actions.

What are the most important points about Introduction to JavaScript?

The main points are: Runs in the browser; Changes page content dynamically; Handles events like clicks.

Why is Introduction to JavaScript useful?

Understanding Introduction to JavaScript helps you design, test and explain programs, websites and systems, from small projects to exam questions.

How can I practise Introduction to JavaScript?

Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.

Which topics are related to Introduction to JavaScript?

Related topics in Computer Science include Networks: LAN and WAN, IP Addresses and DNS, Cloud Computing.

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