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JavaScript Tutorials:- My first JavaScript


A JavaScript consists of JavaScript statements that are placed within the <script>... </script> HTML tags in a web page.
You can place the <script> tag containing your JavaScript anywhere within you web page but it is preferred way to keep it within the <head> tags.
The <script> tag alert the browser program to begin interpreting all the text between these tags as a script. So simple syntax of your JavaScript will be as follows

<script ...>
  JavaScript code
</script>

The script tag takes two important attributes:

·         language: This attribute specifies what scripting language you are using. Typically, its value will be javascript
·         type: This attribute is what is now recommended to indicate the scripting language in use and its value should be set to "text/javascript".

So your JavaScript segment will look like:


<script language="javascript" type="text/javascript">
  JavaScript code
</script>


My first java script:

Let us write our class example to print out "Hello World".

<html>
<body>
<script language="javascript" type="text/javascript">
<!--
   document.write("Hello World!")
//-->
</script>
</body>
</html>

We added an optional HTML comment that surrounds our Javascript code. This is to save our code from a browser that does not support Javascript. The comment ends with a "//-->". Here "//" signifies a comment in Javascript, so we add that to prevent a browser from reading the end of the HTML comment in as a piece of Javascript code.
Next, we call a function document.write which writes a string into our HTML document. This function can be used to write text, HTML, or both. So above code will display following result:

Hello World!

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