check only for numbers in JavaScript

This code will show you how to check only for numbers in JavaScript.

<script type="text/javascript">

var input = '112334'; 
var vali_regex = /^[0-9]+$/;

if(input.match(vali_regex))
{
 alert('This is a number');  
}
else
{
 alert('Not a number');
}
</script>