用javascript生成UUID

有时需要在前端生成UUID，可以在jsp中引用内容如下的文件UUID.js。 

使用时直接用new生成即可 

 var uuidId = new UUID();

UUID.js 

 /*
  *
  * uuid.js - Version 0.3 JavaScript Class to create a UUID like identifier
  *
  * Copyright (C) 2006-2008, Erik Giberti (AF-Design), All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it under
  * the terms of the GNU General Public License as published by the Free Software
  * Foundation; either version 2 of the License, or (at your option) any later
  * version.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
  * details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  * Place, Suite 330, Boston, MA 02111-1307 USA
  *
  * The latest version of this file can be downloaded from
  * http://www.af-design.com/resources/javascript_uuid.php
  *
  * HISTORY: 6/5/06 - Initial Release 5/22/08 - Updated code to run faster,
  * removed randrange(min,max) in favor of a simpler rand(max) function. Reduced
  * overhead by using getTime() method of date class (suggestion by James Hall).
  * 9/5/08 - Fixed a bug with rand(max) and additional efficiencies pointed out
  * by Robert Kieffer http://broofa.com/
  *
  * KNOWN ISSUES: - Still no way to get MAC address in JavaScript - Research into
  * other versions of UUID show promising possibilities (more research needed) -
  * Documentation needs improvement
  *
  */

 // On creation of a UUID object, set it's initial value
 function UUID() {
     this.id = this.createUUID();
 }

 // When asked what this Object is, lie and return it's value
 UUID.prototype.valueOf = function() {
     return this.id;
 }
 UUID.prototype.toString = function() {
     return this.id;
 }

 //
 // INSTANCE SPECIFIC METHODS
 //

 UUID.prototype.createUUID = function() {
     //
     // Loose interpretation of the specification DCE 1.1: Remote Procedure Call
     // described at
     // http://www.opengroup.org/onlinepubs/009629399/apdxa.htm#tagtcjh_37
     // since JavaScript doesn't allow access to internal systems, the last 48
     // bits
     // of the node section is made up using a series of random numbers (6 octets
     // long).
     //
     var dg = new Date(1582, 10, 15, 0, 0, 0, 0);
     var dc = new Date();
     var t = dc.getTime() - dg.getTime();
     var tl = UUID.getIntegerBits(t, 0, 31);
     var tm = UUID.getIntegerBits(t, 32, 47);
     var thv = UUID.getIntegerBits(t, 48, 59) + '1'; // version 1, security version is 2
     var csar = UUID.getIntegerBits(UUID.rand(4095), 0, 7);
     var csl = UUID.getIntegerBits(UUID.rand(4095), 0, 7);

     // since detection of anything about the machine/browser is far to buggy,
     // include some more random numbers here
     // if NIC or an IP can be obtained reliably, that should be put in
     // here instead.
     var n = UUID.getIntegerBits(UUID.rand(8191), 0, 7)
             + UUID.getIntegerBits(UUID.rand(8191), 8, 15)
             + UUID.getIntegerBits(UUID.rand(8191), 0, 7)
             + UUID.getIntegerBits(UUID.rand(8191), 8, 15)
             + UUID.getIntegerBits(UUID.rand(8191), 0, 15); // this last number is two octets long
     return tl + tm + thv + csar + csl + n;
 }

 //
 // GENERAL METHODS (Not instance specific)
 //

 // Pull out only certain bits from a very large integer, used to get the time
 // code information for the first part of a UUID. Will return zero's if there
 // aren't enough bits to shift where it needs to.
 UUID.getIntegerBits = function(val, start, end) {
     var base16 = UUID.returnBase(val, 16);
     var quadArray = new Array();
     var quadString = '';
     var i = 0;
     for (i = 0; i < base16.length; i++) {
         quadArray.push(base16.substring(i, i + 1));
     }
     for (i = Math.floor(start / 4); i <= Math.floor(end / 4); i++) {
         if (!quadArray[i] || quadArray[i] == '')
             quadString += '0';
         else
             quadString += quadArray[i];
     }
     return quadString;
 }

 // Replaced from the original function to leverage the built in methods in
 // JavaScript. Thanks to Robert Kieffer for pointing this one out
 UUID.returnBase = function(number, base) {
     return (number).toString(base).toUpperCase();
 }

 // pick a random number within a range of numbers
 // int b rand(int a); where 0 <= b <= a
 UUID.rand = function(max) {
     return Math.floor(Math.random() * (max + 1));
 }

 // end of UUID class file