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Introduction to Java

In: Computers and Technology

Submitted By khen
Words 9622
Pages 39
Introduction to Javascript

JavaScript has been around for several years now, in many different flavors. The main benefit of Javascript is to add additional interaction between the website and its visitors with just a little extra work by the web developer. Javascript allows industrious web masters to get more out of their website than HTML and CSS can provide.
By definition, JavaScript is a client-side scripting language. This means the web surfer's browser will be running the script. The opposite of client-side is server-side, which occurs in a language like PHP. PHP scripts are run by the web hosting server.
How To Write JavaScript
If you have ever used CSS before, you will find the whole part about including JavaScript will be a lot simpler to grasp. Here are Tizag's three important steps you should always follow when creating or using someone else's JavaScript code: 1. Use the script tag to tell the browser you are using JavaScript. 2. Write or download some JavaScript 3. Test the script!
There are so many different things that can go wrong with a script, be it human error, browser compatibility issues, or operating system differences. So, when using JavaScript, be sure that you test your script out on a wide variety of systems and most importantly, on different web browsers.
Your First JavaScript Script
To follow the classic examples of many programming tutorials, let's use JavaScript to print out "Hello World" to the browser. I know this isn't very interesting, but it will be a good way to explain all the overhead required to do something in JavaScript.
HTML & JavaScript Code:
<html>
<body>
<script type="text/JavaScript">
<!--
document.write("Hello World!")
//-->
</script>
</body>
</html>
Display:
Hello World!
Our first step was to tell the browser we were using a script with the

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