UUID

        function uuidv4() {
            return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
                (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
            );
        }

        console.log(uuidv4());//cfd3d3e1-02a1-4074-8dc1-927d7407c828