js生成UUID

 var createUUID = (function (uuidRegEx, uuidReplacer) {      return function () {          return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(uuidRegEx, uuidReplacer).toUpperCase();      };  })(/[xy]/g, function (c) {      var r = Math.random() * 16 | 0,          v = c == "x" ? r : (r & 3 | 8);      return v.toString(16);  });  alert(createUUID());

亲测可用!喜欢的收藏起来.