Several algorithms sharing of javasript generation UUID

Way One

functionuuid () {vars = []; varHexdigits = "0123456789abcdef";  for(vari = 0; I < 36; i++) {S[i]= Hexdigits.substr (Math.floor (Math.random () * 0x10), 1); } s[14] = "4";//bits 12-15 of the Time_hi_and_version field to 0010S[19] = Hexdigits.substr ((s[19] & 0x3) | 0x8, 1);//bits 6-7 of the clock_seq_hi_and_reserved toS[8] = s[13] = s[18] = s[23] = "-"; varUUID = S.join (""); returnuuid;}

Way Two

function guid () {    returnfunction(c) {        var r = math.random () *16|0, v = c = = ' X '? R: (r&0x3|0x8);         return v.tostring (+);    });

Mode three

function guid () {    function  S4 () {       return (((1+math.random ()) *0x10000) | ToString (+). SUBSTRING (1);    }     return (S4 () +s4 () + "-" +s4 () + "-" +s4 () + "-" +s4 () + "-" +S4 () +s4 () +S4 ());}

Mode Four

functionuuid (len, radix) {varchars = ' 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz '. Split ('); varUUID =[], 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      varR; //rfc4122 requires these charactersUUID[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 < i++;) {        if(!Uuid[i]) {R= 0 | Math.random () *16; Uuid[i]= chars[(i = = 19)? (R & 0x3) | 0x8: R]; }      }    }    returnUuid.join (' ');}

Recommended use mode four, mode four use example is as follows:

// 8 character ID (base=2)uuid (8, 2)  //  "01001010"//  8 character ID ( base=10)//  "47473046"/ / 8 character ID (base=16)// "098f4d35"

Reference http://www.jb51.net/article/40678.htm

Javasript several algorithms for generating UUID sharing