Javascript Number padZero(length)

/**/*  w  w w  .ja  va  2 s  . c o  m*/
 * Makes a number string with leading zeros.
 *
 * @method Number.prototype.padZero
 * @param {Number} length The length of the output string
 * @return {String} A string with leading zeros
 */
Number.prototype.padZero = function(length){
    return String(this).padZero(length);
};