Cette libre de HTML JavaScript tutoriel donne quelques concepts de base de JavaScript de programmation pour les d

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x = x + 1;  y = 20;  z = x+y;

As the semicolon is optional, we can represent above statements separated with a line-break.

x = x + 1
y = 20
z = x+y

Categories of JavaScript Statements

Depending on the task a statement perform, they are categories as:

• Conditional Statements
• Loop Statements
• Object Manipulation Statements
• Comment Statements
• Exception Handling Statements

JavaScript Blocks - Group of JavaScript Statements

JavaScript statements can be grouped together in blocks. Curly braces ({ }) are used to group a list of statements together in blocks. JavaScript block helps to execute sequence of statements together to perform a specific task. JavaScript block are the integral part of the function and conditional loops.

<script type="text/javascript">
for (x=0; x < 10; x++)
{
  document.write("x="+ x +"<br>");
}
</script>

Some Tips on declaring a JavaScript Statement

• JavaScript programs are written using the Unicode character set.
• JavaScript is a case-sensitive language so take care while defining and using variables, function names.
• Do not use reserved keywords as variables, function names.
• JavaScript ignores spaces, tabs, and newlines that appear between tokens in programs so indent your programs as per your consistency.
• Omitting semicolons is not a good programming practice; you should get in the habit of using them.

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par thuong, 14/11/2010 10:11 AM
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By the way ! can you tell me the code that when i scoll down ! a div will be pick up and run along with the page ? thanks a lot !

par clasamente, 01/12/2010 08:12 PM
Réponse

This tutorial is very good for newbies like me. It is very well that you pointed to not use reserved keywords, i did the mistake once and it took me some while until i realized what is the problem

par gsptv, 18/01/2012 05:01 AM
Réponse

very good tutorial, thanks a lot !

par Avant-première

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