js中创建UUID

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function 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));};

将以上js放入独立的js文件，文件名可以为UUID.js，

调用UUID.prototype.createUUID ();该方法将会返回一个32位的UUID值