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JavaScript While Loop

The while loop

The while loop is used when you want the loop to execute and continue
executing while the specified condition is true.

while (var<=endvalue)
{
    code to be executed
}

Note: The <=
could be any comparing statement.

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.

<html>
<body>
<script type="text/javascript">
var i=0;
while (i<=10)
{
document.write("The number is " + i);
document.write("<br />");
i=i+1;
}

</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 do...while Loop

The do...while loop is a variant of the while loop. This loop will
always execute a block of code ONCE, and then it will
repeat the loop as long as the specified condition is true. This loop will
always be executed at least once, even if the condition is false, because the code is
executed before the condition is tested.

do
{
    code to be executed
}
while (var<=endvalue);

Example

<html>
<body>
<script type="text/javascript">
var i=0;
do 
{
document.write("The number is " + i);
document.write("<br />");
i=i+1;
}
while (i<0);
</script>

</body>
</html>

Result

The number is 0

Gayabo

posted by Computer @ 10:48,

Computer Consultant

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JavaScript While Loop

The while loop

The do...while Loop

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