js UUID

 /*!Math.uuid.js (v1.4)http://www.broofa.commailto:[e-mail] Copyright (c) 2010 Robert KiefferDual licensed under the MIT and GPL licenses.*/ /* * Generate a random uuid. * * USAGE: Math.uuid(length, radix) *   length - the desired number of characters *   radix  - the number of allowable values for each character. * * EXAMPLES: *   // No arguments  - returns RFC4122, version 4 ID *   >>> Math.uuid() *   "92329D39-6F5C-4520-ABFC-AAB64544E172" * *   // One argument - returns ID of the specified length *   >>> Math.uuid(15)     // 15 character ID (default base=62) *   "VcydxgltxrVZSTV" * *   // Two arguments - returns ID of the specified length, and radix. (Radix must be <= 62) *   >>> Math.uuid(8, 2)  // 8 character ID (base=2) *   "01001010" *   >>> Math.uuid(8, 10) // 8 character ID (base=10) *   "47473046" *   >>> Math.uuid(8, 16) // 8 character ID (base=16) *   "098F4D35" */(function() {  // Private array of chars to use  var CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');   Math.uuid = function (len, radix) {    var chars = CHARS, uuid = [], i;    radix = radix || chars.length;     if (len) {      // Compact form      for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];    } else {      // rfc4122, version 4 form      var r;       // rfc4122 requires these characters      uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';      uuid[14] = '4';       // Fill in random data.  At i==19 set the high bits of clock sequence as      // per rfc4122, sec. 4.1.5      for (i = 0; i < 36; i++) {        if (!uuid[i]) {          r = 0 | Math.random()*16;          uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];        }      }    }     return uuid.join('');  };   // A more performant, but slightly bulkier, RFC4122v4 solution.  We boost performance  // by minimizing calls to random()  Math.uuidFast = function() {    var chars = CHARS, uuid = new Array(36), rnd=0, r;    for (var i = 0; i < 36; i++) {      if (i==8 || i==13 ||  i==18 || i==23) {        uuid[i] = '-';      } else if (i==14) {        uuid[i] = '4';      } else {        if (rnd <= 0x02) rnd = 0x2000000 + (Math.random()*0x1000000)|0;        r = rnd & 0xf;        rnd = rnd >> 4;        uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];      }    }    return uuid.join('');  };   // A more compact, but less performant, RFC4122v4 solution:  Math.uuidCompact = function() {    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {      var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);      return v.toString(16);    });  };})(); 

调用方法：

Math.uuid()：

方法二：

 //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    // 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;};//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 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));}; 

调用方法：

UUID.prototype.createUUID()