Show a leading zero if a number is less than 10
Try this
function pad (str, max) {
return str.length < max ? pad("0" + str, max) : str;
}
alert(pad("5", 2));
Example
http://jsfiddle.net/
Or
var number = 5;
var i;
if (number < 10) {
alert("0"+number);
}
Example
http://jsfiddle.net/
There's no built-in JavaScript function to do this, but you can write your own fairly easily:
function pad(n) {
return (n < 10) ? ("0" + n) : n;
}
EDIT:
Meanwhile there is a native JS function that does that. See String#padStart
console.log(String(5).padStart(2, '0'));