Javascript生成UUID

代码一：

/*!
Math.uuid.js (v1.4)
http://www.broofa.com
mailto:[email protected]
 
Copyright (c) 2010 Robert Kieffer
Dual 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()

代码二：

//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
    // 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 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));
};

调用方法：UUID.prototype.createUUID()