Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
  Benchmark.prototype.setup = function() {
    UUID = GenID = function (mode,rint) {
            switch (mode) {
                   case 1:
                      var seed = (rint?rint:Math.floor((Math.random()*0x75bcd15)+(Math.random()*0x75bcd15)));
                      return parseInt(((new Date()).getTime()+seed),36).toString(16);
                   case 2:
                      return (function(a,b){for(b=a='';a++<36;b+=a*51&52?(a^15?8^Math.random()*(a^20?(rint?rint:16):4):4).toString(16):'-');return b})();
                   case 3:
                      return Math.random().toString(36).split('.')[1].substring((rint?rint:5));
                   default:
                      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
                           var r = Math.random()*16|0; return (c=='x'?r:(r&0x3|0x8)).toString(16);
                      });
            };
    };
    
  };
</script>

Test runner

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GenID();

GenID(2);

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