Answers for "add trailing zeros in javascript"

javascript remove leading zeros from string

use a regular expression like this  

var strNumber = "0049";  
console.log(typeof strNumber); //string  
  
var number  = strNumber.replace(/^0+/, '');

js number add zero before

('0' + 11).slice(-2) // '11'
('0' + 4).slice(-2)  // '04'