uuid

console.log(uuid());
console.log(uuid());
console.log(uuid());
console.log(uuid());

function uuid() {
    var code = 'abcdef1234567890';
    var max = code.length;
    var str = '';
    for (var i=0; i<32; i++) {
        str += code.charAt(Math.floor(Math.random() * max));
        if (i==8 || i==12 || i==16 || i==20 ) {
            str += '-';
        }
    }
    return str;
}