Introduction to Javascript


By Emmanuel Chinonso

Web Developer

JavaScript Tutorial

We'll cover the fundamentals of JavaScript and how to use it in projects and at work in this JavaScript lesson.

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What is JavaScript: The most widely utilized scripting computer language for making websites more interactive is JavaScript. It is free and open-source, and all browsers support it. JavaScript can also be used to create games and mobile apps.

Prerequisites for this JavaScript Tutorial: You should know how to use HTML and CSS at a basic level. It will make learning JavaScript much easier.

Who is JavaScript for?

Students that want to learn web applications should use JavaScript. It is also intended for web development pros. What are JavaScript engines and how do they work? This is how JavaScript works. The engine reads the script ("parsed:). The script is then converted or compiled into machine language. The machine code then executes.

What makes JavaScript unique?

These are the three most distinguishing characteristics of JavaScript.

  • It supports full HTML/CSS integration.
  • Simple tasks are completed quickly and without complication or rigorous adherence to regulations.
  • All major browsers support JavaScript, which is enabled by default.

What can in-browser JavaScript do?

JavaScript's functionality is determined on the environment in which it is used. Node.js, for example, has functions that allow JavaScript to read and write arbitrary files, make network queries, and so on. JavaScript can play a variety of roles in both client-side (front end) and server-side (back end) application development.

In-browser JavaScript also allows you to manipulate webpages, interact with users, and interact with the web server.

JavaScript has several advantages, including

-the ability to display dynamic material based on the user's profile.

  • Respond to user actions such as mouse clicks, key presses, and pointer movements.
  • Provide support for features such as auto-validated form entries and interactive drop-down menus.
  • Sending queries to remote sites, as well as uploading and downloading files
  • JavaScript code can also generate music and movement.
  • Interrogate users, obtain and set cookies, display messages, and switch browser tabs.
  • You can easily save data locally in JavaScript.

What can't in-browser JavaScript do?

For the sake of the user's protection, JavaScript's capabilities in the browser are severely constrained. It protects personal information from being accessed by illegitimate websites. The following are some examples of such limitations:

  • You may not be able to copy, execute, or read/write arbitrary files on the hard disk using JavaScript on a webpage. It doesn't provide you access to any of the operating system's features.
  • Many browsers allow it to operate with files, but access is restricted and granted only when the user performs a specified action, such as dropping a file into a browser window or selecting using the <input> tag.
  • JavaScript allows you to communicate with the server that generated the current page across the internet. It does not, however, allow you to get data from other websites or domains.

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