JavaScript method for generating GUIDs

first, the method of generating a GUIDJScript CodeCopy

{    {       1+math.random () *0x10000)-|-((()). ToString (+). substring (1);    }    Return (S4 () +s4 () + "-" +s4 () + "-" +s4 () + "-" +s4 () + "-" +s4 () +s4 () +s4 ());}

Second, the method of generating GUID two

JScript CodeCopy

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

Third, the method of generating the GUID three

JScript CodeCopy

{    var s = [];    var hexdigits = "0123456789abcdef";    {        S[i] = Hexdigits.substr (Math.floor (Math.random () * 0x10), 1);    }    S[14] = "4";  Bits 12-15 of the Time_hi_and_version field to 0010    s[19] = Hexdigits.substr ((s[19] & 0x3) | 0x8, 1);  Bits 6-7 of the clock_seq_hi_and_reserved to    s[8] = s[13] = s[18] = s[23] = "-";     var uuid = S.join ("");    return uuid;}

Iv. method of generating GUIDs four

JScript CodeCopy

function uuid (len, Radix){var chars = '    0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz '. Split (');    var 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 <; i++) {if (!uuid[i]) {r = 0 | Math.random () *16; Uuid[i] = chars[(i = = 19)? (R & 0x3) | 0X8:R]; }}} return Uuid.join (");}     

How JavaScript generates GUIDs