Add Zero before number less than 10

zero-before.js

('0' + 11).slice(-2) // '11'
('0' + 4).slice(-2)  // '04'
For ease of access, you could of course extract it to a function, or even extend Number with it:

Number.prototype.pad = function(n) {
    return new Array(n).join('0').slice((n || 2) * -1) + this;
}
Which will allow you to write:

c += deg.pad() + '° '; // "04° "
The above function pad accepts an argument specifying the length of the desired string. If no such argument is used, it defaults to 2. You could write:

deg.pad(4) // "0045"