export const guid = () => {
    return (__s4() + __s4() + "-" + __s4() + "-" + __s4() + "-" + __s4() + "-" + __s4() +
        __s4() + __s4());
}
const __s4 = () => {
    return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
}