Computer Consultant: JavaScript For Loop

Custom Search

JavaScript For Loop

JavaScript Loops

Very often when you write code, you want the same block of code to run
over and over again in a row. Instead of adding several almost equal lines in a script
we can use loops to
perform a task like this.

In JavaScript there are two different kind of loops:

for - loops through a block of code a specified number of times

while - loops through a block of code while a specified condition
is true

The for Loop

The for loop is used when you know in advance how many times the script
should run.

Syntax

for (var=startvalue;var<=endvalue;var=var+increment) 
{
    code to be executed
}

Example

Explanation: The example below defines a loop that starts with i=0. The loop
will continue to run as long as i is less than, or equal to 10. i
will increase by 1 each time the loop runs.

Note: The increment parameter could also be negative, and the <=
could be any comparing statement.

<html>
<body>
<script type="text/javascript">
var i=0;
for (i=0;i<=10;i++)
{
document.write("The number is " + i);
document.write("<br />");
}

</script>
</body>
</html>

Result

The number is 0
The number is 1
The number is 2
The number is 3
The number is 4
The number is 5
The number is 6
The number is 7
The number is 8
The number is 9
The number is 10

The while loop

The while loop will be explained in the next chapter.

Gayabo

posted by Computer @ 10:48,

Computer Consultant

Computer Consultant, Network Security Consulting, Computer Consultants

JavaScript For Loop

JavaScript Loops

The for Loop

The while loop

0 Comments: