function generateUUID() { var d = new Date().getTime(); var uuid = 'xxxxxxxxxxxx4xxxyxxxxxxxxxxxxxxx'.replace(/[xy]/g, function (c) { var r = (d + Math.random() * 16) % 16 | 0; d = Math.floor(d / 16); return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16); }); return uuid; } console.log(generateUUID()); console.log(generateUUID()); console.log(generateUUID());