Generate a unique ID number. You can specify how many characters you want the length to be

sample.js

//Generate a unique ID number
function generateUniqueID() {
    var length = 10;
    var chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    var result = '';
    for (var i = length; i > 0; --i) result += chars[Math.round(Math.random() * (chars.length - 1))];
    return result;
}

//Usage: declare variable then assign it the value of the newly generated ID
var unique_id = generateUniqueID();