JavaScript to Fill a var with leading zeros.

I need a javascript that will fill a variable with leading zeros so it always stays 7 bytes in length.

For example:
Before                  After
13777                 0013777
  4022                 0004022
1                         0000001
99                       0000099
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function pad(num, size) {
    var s = num+"";
    while (s.length < size) s = "0" + s;
    return s;

console.log(pad(1, 7));
console.log(pad(123, 7));
console.log(pad(4567890, 7));

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Rainer JeschorCommented:
UPDATE - there was an error in the code - the updated one works:
alternative way
function FillZero(org,size){
  return ('0000000000000'+org).slice(-size);

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