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<=5;i++)
{document.write("The number is " + i)document.write("<br />")}
</script>
</body>
</html>
ResultThe number is 0
The number is 1
The number is 2
The number is 3
The number is 4
The number is 5
Example:
<html>
<body>
<script type="text/javascript">
for (i = 0; i <= 5; i++)
{
document.write("The number is " + i)
document.write("<br />")
}
</script>
<p>Explanation:</p>
<p>This for loop starts with i=0.</p>
<p>As long as <b>i</b> is less than, or equal to 5, the loop will continue to run.</p>
<p><b>i</b> will increase by 1 each time the loop runs.</p>
</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 1
The number is 2
The number is 3
The number is 4
The number is 5
Explanation:
This for loop starts with i=0.
As long as i is less than, or equal to 5, the loop will continue to run.
i will increase by 1 each time the loop runs.
Eamples (Looping through HTML headers) :
<html>
<body>
<script type="text/javascript">
for (i = 1; i <= 6; i++)
{
document.write("<h" + i + ">This is header " + i)
document.write("</h" + i + ">")
}
</script>
</body>
</html>
Result:
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