How to generate UUID with two lines of Javascript code

Discover an easy way to generate UUIDs in a Javascript application without relying on third-party libraries.

function uuid() {
  var temp_url = URL.createObjectURL(new Blob());
  var uuid = temp_url.toString(); // blob:https://xxx.com/b250d159-e1b6-4a87-9002-885d90033be3
  URL.revokeObjectURL(temp_url);
  return uuid.substr(uuid.lastIndexOf("/") + 1);
}

The URL.createObjectURL method can be used in Javascript to create a unique URL that represents the object passed to it. In order to make this URL unique, the URL returned by the URL.createObjectURL method will carry a 36-bit long string, which is the same length as the UUID. Through this principle, the UUID can be simulated.

Here are some examples of UUIDs generated by this method:

for (var i = 0; i < 10; ++i) {
  console.log(uuid());
}

// 执行结果如下
// f6ca05c0-fad5-46fc-a237-a8e930e7cb49
// 6a88664e-51e1-48c3-a85e-7bf00467e9e6
// e6050f4c-e86d-4081-9376-099bfbef2c30
// bde3da3c-b318-4498-8a03-9a773afa84bd
// ba0fda03-f806-4c2f-b6f5-1e74a299e603
// 62b2edc3-b09f-4bf9-8dbf-c4d599479a29
// e70c0609-22ad-4493-abcc-0e3445291397
// 920255b2-1838-497d-bc33-56550842b378
// 45559c64-971c-4236-9cfc-706048b60e70
// 4bc4bbb9-1e90-432b-99e8-277b40af92cd

Note: The purpose of URL.createObjectURL is not to generate random UUIDs. Therefore, the above method of generating UUIDs may cause side effects that I am not yet aware of. If you can think of any questions, please leave a message and reply to me, thank you.

Recommended tutorial: "JS Tutorial"

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