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JavaScript Introduction

JS Introductions

JavaScript is the world's most popular programming language for the web.

JavaScript was invented by Brendan Eich in 1995, and became an ECMA standard in 1997.

JavaScript is the world's most popular programming language used to create dynamic web pages.

Why Learn JavaScript?

JavaScript is one of the 3 languages all web developer must learn:

HTML: to define the content of web pages

CSS: to specify the layout of web pages

JS: to specify the behavior of web pages

JS Can Update Content

One of many JavaScript HTML methods is getElementById(), to select HTML element and perform actions.

          document.getElementById("demo").innerHTML = "Hello JavaScript";
JS Can Show/Hide Content

With JS you can update style of the HTML element dynamically.

          /* Hide Content */
          document.getElementById("demo").style.display = "none";

          /* Show Content */
          document.getElementById("demo").style.display = "block";

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