Javascript-Syntax

Pritty August 5, 2015 Javascript Leave a comment 190 Views

Hi all,
JavaScript syntax is the set of rules.JavaScript can be implemented using JavaScript statements in webpages that are placed within the <script>……..</script> HTML tags.You can place the <script&gt tags anywhere within your web page. but it is normally recommended that you should keep it within the <head> tags.

A simple syntax of your JavaScript will appear as follows.

The script tag takes two important attributes −

Language − This attribute specifies what scripting language you are using. Typically, its value will be javascript.
eg:

<script language=”javascript”&ht;
JavaScript code
</script>
Type − This attribute is what is now recommended to indicate the scripting language in use.Its value should be set to “text/javascript”.
eg:

<script type=”text/javascript”>
JavaScript code
</script>

So your JavaScript segment will look like −

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

JavaScript code

</script>

Comments in JavaScript

JavaScript supports both C-style comments and C++-style comments:

One-line comments of C++ style. These comments begin with // and continue up to the next line break,and is ignored by JavaScript.
eg:

// This is a one-line comment

Multiple-line C-style comments. Everything between /* and */ is a comment.
eg:

/* This is a comment */
/* This is first comment
This is second comment
This is third comment
*/
One-line comments with the HTML comment-opening sequence (<!—).
eg:

<!—This is also a one-line JS comment —>M

Javascript Comment Example

<script language="javascript" type="text/javascript">
   <!--
   
      // This is a comment. It is similar to comments in C++
   
      /*
      * This is a multiline comment in JavaScript
      * It is very similar to comments in C Programming
      */
   
   //-->
</script>