http://*.com/questions/105034/how-to-create-a-guid-uuid-in-javascript

　function generateUUID(){

    var d = new Date().getTime();

    var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {

        var r = (d + Math.random()*16)%16 | 0;

        d = Math.floor(d/16);

        return (c=='x' ? r : (r&0x7|0x8)).toString(16);

    });

    return uuid;

};

//UUID/Guid Generator

// use: UUID.create() or UUID.createSequential()

// convenience:  UUID.empty, UUID.tryParse(string)

(function(w){

  // From http://baagoe.com/en/RandomMusings/javascript/

  // Johannes Baagøe <baagoe@baagoe.com>, 2010

  function Mash() {

    var n = 0xefc8249d;

    var mash = function(data) {

    data = data.toString();

    for (var i = 0; i < data.length; i++) {

      n += data.charCodeAt(i);

      var h = 0.02519603282416938 * n;

      n = h >>> 0;

      h -= n;

      h *= n;

      n = h >>> 0;

      h -= n;

      n += h * 0x100000000; // 2^32

    }

    return (n >>> 0) * 2.3283064365386963e-10; // 2^-32

    };

    mash.version = 'Mash 0.9';

    return mash;

  }

  // From http://baagoe.com/en/RandomMusings/javascript/

  function Kybos() {

    return (function(args) {

    // Johannes Baagøe <baagoe@baagoe.com>, 2010

    var s0 = 0;

    var s1 = 0;

    var s2 = 0;

    var c = 1;

    var s = [];

    var k = 0;

    var mash = Mash();

    var s0 = mash(' ');

    var s1 = mash(' ');

    var s2 = mash(' ');

    for (var j = 0; j < 8; j++) {

      s[j] = mash(' ');

    }

    if (args.length == 0) {

      args = [+new Date];

    }

    for (var i = 0; i < args.length; i++) {

      s0 -= mash(args[i]);

      if (s0 < 0) {

      s0 += 1;

      }

      s1 -= mash(args[i]);

      if (s1 < 0) {

      s1 += 1;

      }

      s2 -= mash(args[i]);

      if (s2 < 0) {

      s2 += 1;

      }

      for (var j = 0; j < 8; j++) {

      s[j] -= mash(args[i]);

      if (s[j] < 0) {

        s[j] += 1;

      }

      }

    }

    var random = function() {

      var a = 2091639;

      k = s[k] * 8 | 0;

      var r = s[k];

      var t = a * s0 + c * 2.3283064365386963e-10; // 2^-32

      s0 = s1;

      s1 = s2;

      s2 = t - (c = t | 0);

      s[k] -= s2;

      if (s[k] < 0) {

      s[k] += 1;

      }

      return r;

    };

    random.uint32 = function() {

      return random() * 0x100000000; // 2^32

    };

    random.fract53 = function() {

      return random() +

      (random() * 0x200000 | 0) * 1.1102230246251565e-16; // 2^-53

    };

    random.addNoise = function() {

      for (var i = arguments.length - 1; i >= 0; i--) {

      for (j = 0; j < 8; j++) {

        s[j] -= mash(arguments[i]);

        if (s[j] < 0) {

        s[j] += 1;

        }

      }

      }

    };

    random.version = 'Kybos 0.9';

    random.args = args;

    return random;

    } (Array.prototype.slice.call(arguments)));

  };

  var rnd = Kybos();

  // UUID/GUID implementation from http://frugalcoder.us/post/2012/01/13/javascript-guid-uuid-generator.aspx

  var UUID = {

    "empty": "00000000-0000-0000-0000-000000000000"

    ,"parse": function(input) {

      var ret = input.toString().trim().toLowerCase().replace(/^[\s\r\n]+|[\{\}]|[\s\r\n]+$/g, "");

      if ((/[a-f0-9]{8}\-[a-f0-9]{4}\-[a-f0-9]{4}\-[a-f0-9]{4}\-[a-f0-9]{12}/).test(ret))

        return ret;

      else

        throw new Error("Unable to parse UUID");

    }

    ,"createSequential": function() {

      var ret = new Date().valueOf().toString(16).replace("-","")

      for (;ret.length < 12; ret = "0" + ret);

      ret = ret.substr(ret.length-12,12); //only least significant part

      for (;ret.length < 32;ret += Math.floor(rnd() * 0xffffffff).toString(16));

      return [ret.substr(0,8), ret.substr(8,4), "4" + ret.substr(12,3), "89AB"[Math.floor(Math.random()*4)] + ret.substr(16,3),  ret.substr(20,12)].join("-");

    }

    ,"create": function() {

      var ret = "";

      for (;ret.length < 32;ret += Math.floor(rnd() * 0xffffffff).toString(16));

      return [ret.substr(0,8), ret.substr(8,4), "4" + ret.substr(12,3), "89AB"[Math.floor(Math.random()*4)] + ret.substr(16,3),  ret.substr(20,12)].join("-");

    }

    ,"random": function() {

      return rnd();

    }

    ,"tryParse": function(input) {

      try {

        return UUID.parse(input);

      } catch(ex) {

        return UUID.empty;

      }

    }

  };

  UUID["new"] = UUID.create;

  w.UUID = w.Guid = UUID;

}(window || this));