在 JavaScript 中创建 GUID / UUID？

Question

I'm trying to create globally-unique identifiers in JavaScript. I'm not sure what routines are available on all browsers, how "random" and seeded the built-in random number generator is, etc..

The GUID / UUID should be at least 32 characters and should stay in the ASCII range to avoid trouble when passing them around.

转载于:https://stackoverflow.com/questions/105034/create-guid-uuid-in-javascript

Answer 1

There have been a couple attempts at this. The question is: do you want actual GUIDs, or just random numbers that look like GUIDs? It's easy enough to generate random numbers.

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

However, note that such values are not genuine GUIDs.

Note: the provided code snippet does not follow RFC4122 which requires that the version (4) has to be integrated into the generated output string. Do not use this answer if you need compliant GUIDs.

Use:

var uuid = guid();

Demo:

function guid() {
  return "ss-s-s-s-sss".replace(/s/g, s4);
}

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

document.getElementById('jsGenId').addEventListener('click', function() {
  document.getElementById('jsIdResult').value = guid();
})

input { font-family: monospace; }

<button id="jsGenId" type="button">Generate GUID</button>
<br>
<input id="jsIdResult" type="text" placeholder="Results will be placed here..." readonly size="40"/>

</div>