JavaScript is making the web interactive!

JavaScript is a scripting language and can run on both clients and servers.

Similar as the other programming languages, JavaScript can be learnt from the following aspects: variables, data types, operators, reserved words, basic operations including loops, conditionals, etc.

Object is a very important data type in JavaScript, everything in JavaScript can be regarded as or be thought as an object when you do programming.

Some key points of JavaScript:

• Always put the JavaScript codes in a .js file and link it in the HTML page.
• In most cases, you need to manipulate the DOM using JavaScript.
• A lot of libraries, frameworks and tools can be utilized for JavaScript programming.

A typical example code of JavaScript:

var div = document.getElementsByTagName("div")[0];
div.addEventListener("click", function() {
	alert("Hello World!");
});
#=> pop up an alert box saying "Hello World!" when you click a div

Search and check out the comprehensive JavaScript book for reference JavaScript: The Definitive Guide for more info about JavaScript. And the same basic and comprehensive JavaScript knowlege base is Mozilla Developer Network. The JavaScript official website is ECMAScript. If you have questions, you can drop me an email below.