JAVASCRIPT

js number add zero before

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

add zero in front of numbers javascript

function checkTime(i) {
    if (i<10) {i = "0" + i};  // add zero in front of numbers < 10
    return i;
}

js append zeros

var str = "5";
alert(str.lpad("0", 4)); //result "0005"
var str = "10"; // note this is string type
alert(str.lpad("0", 4)); //result "0010"

js add zeros before number

('0' + deg).slice(-2)