Remove/ truncate leading zeros by javascript/jquery

I would use the Number() function:

var str = "00001";
str = Number(str).toString();

>> "1"

Or I would multiply my string by 1

var str = "00000000002346301625363";
str = (str * 1).toString();

>> "2346301625363"

You can use a regular expression that matches zeroes at the beginning of the string:

s = s.replace(/^0+/, '');