What does this JavaScript code do?

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 JavaScript code run by?

The source code is passed through a program called a compiler, which translates it into bytecode that the machine understands and can execute. In contrast, JavaScript has no compilation step. Instead, an interpreter in the browser reads over the JavaScript code, interprets each line, and runs it.

How do I find my JavaScript code?

Following is a free list of tools you can use to check, test and verify your JS code:

  1. Google Code Playground.
  2. JavaScript Sandbox.
  3. jsbin.
  4. jsfiddle.
  5. pastebin.
  6. jsdo.it.
  7. firebug.
  8. html5snippet.net.

Why is JavaScript important?

js makes responsive design easier. JavaScript has become integral to the Internet experience as developers build increased interaction and complexity into their applications. Search engines, ecommerce, content management systems, responsive design, social media and phone apps would not be possible without it.

How does JavaScript works on a website?

The web browser loads a web page, parses the HTML, and creates what is known as a Document Object Model (DOM) from the contents. The DOM presents a live view of the web page to your JavaScript code. The browser will then grab everything linked to the HTML, like images and CSS files.

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How do I see JavaScript code in browser?

Press Command+Option+J (Mac) or Control+Shift+J (Windows, Linux, Chrome OS) to jump straight into the Console panel of Chrome DevTools. Or, navigate to More Tools > Developer Tools from Chrome menu, and click Console tab. The error console will open. If you don’t see any errors try reloading the page.

How do you check JavaScript code in Chrome?

Open Chrome, press Ctrl+Shift+j and it opens the JavaScript console where you can write and test your code.

Do all websites use JavaScript?

JavaScript is the universal programming language of the web. In fact, JavaScript is used by 97.6% of all websites, according to W3Techs.

Is JavaScript good for websites?

The importance of JavaScript as a web technology can be determined from the fact that it is currently used by 94.5% of all websites. As a client-side programming language, JavaScript helps web developers to make web pages dynamic and interactive by implementing custom client-side scripts.

Should I use JavaScript?

First and foremost, if you want to get into web development — both front-end and back-end engineering — JavaScript is a must. The language’s versatility means it can also be used for application design, animation, and game development. Plus, it’s easy to learn, so it’s a great choice as a first language.

What can I build with JavaScript?

7 apps you can build with JavaScript

  • Websites. This one is pretty obvious. …
  • Web applications. As browsers and computers improved over time, so their abilities to support robust web applications. …
  • Server applications. The rise of Node. …
  • Games. …
  • Smartwatch applications. …
  • Mobile applications. …
  • Internet of Things (IoT)
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What information can JavaScript modify?

JavaScript is the dynamic, lightweight and most commonly computer programming language used to create a web pages. It interact with client side and make dynamic pages. JavaScript Can Change Content of HTML page: The getElementById() method is used to get the id of element and change the HTML content.

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