RandomGuid.js

javascript: (function () {
    function guid() {
        function s4() {
            return Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1);
        }
        return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
    }

    function copy(text) {
        var input = document.createElement('input');
        input.style.position = 'fixed';
        input.style.opacity = 0;
        input.value = text;
        document.body.appendChild(input);
        input.select();
        var successful = document.execCommand('copy');
        document.body.removeChild(input);
        return successful;
    }
    var uuid = guid();
    var successful = copy(uuid);
    window.alert(successful ? "Copied to clipboard UUID = " + uuid : "Failed to copy UUID");
})()