UUID生成器_Javascript版
/*uuid.js - Version 0.3JavaScript Class to create a UUID like identifierCopyright (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 USAThe latest version of this file can be downloaded fromhttp://www.af-design.com/resources/javascript_uuid.phpHISTORY:6/5/06 - Initial Release5/22/08 - 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 valuefunction UUID(){ this.id = this.createUUID();}// When asked what this Object is, lie and return it's valueUUID.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 || quadArray == '') quadString += '0'; else quadString += quadArray; } return quadString;}// Replaced from the original function to leverage the built in methods in// JavaScript. Thanks to Robert Kieffer for pointing this one outUUID.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 <= aUUID.rand = function(max){ return Math.floor(Math.random() * (max + 1));}// end of UUID class file/*for(var i = 0; i < 10; i++){ document.write(new UUID().id); document.write("<br/>");}*/
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