JS Introduction

1. Intro

  • WHAT: JavaScript is the programming language of HTML and the Web.
  • HOW: JavaScript is easy to learn.
  • WHY: JavaScript is one of the 3 languages all web developers must learn:
    1. HTML to define the content of web pages
    2. CSS to specify the layout of web pages
    3. JavaScript to program the behavior of web pages

Java vs. JavaScript

  • They are completely different languages, both in concept and design.
  • JavaScript was invented by Brendan Eich in 1995, and became an ECMA standard in 1997. ECMA-262 is the official name (a.k.a. ECMAScript).

2. A Simple Example

<!DOCTYPE html>
<h1>My First JavaScript</h1>
<button type="button" onclick="document.getElementById('demo').innerHTML = new Date() ">
    Click me to display Date and Time.
<p id="demo"></p>

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