function generateUUID() {
var d = new Date().getTime();
var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
  var r = (d + Math.random()*16)%16 | 0;
  d = Math.floor(d/16);
  return (c=='x' "htmlcode">

function guid() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = Math.random()*16|0, v = c == 'x' "htmlcode">

function guid() {
  function S4() {
    return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
  }
  return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
}
 




算法4


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 < 36; i++) {
    if (!uuid[i]) {
     r = 0 | Math.random()*16;
     uuid[i] = chars[(i == 19) "htmlcode">

// 8 character ID (base=2)
uuid(8, 2) // "01001010"
// 8 character ID (base=10)
uuid(8, 10) // "47473046"
// 8 character ID (base=16)
uuid(8, 16) // "098F4D35"




算法5


function uuid() {
  var s = [];
  var hexDigits = "0123456789abcdef";
  for (var i = 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 0010
  s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
  s[8] = s[13] = s[18] = s[23] = "-";
 
  var uuid = s.join("");
  return uuid;
}
 



当然了，个人还是推荐算法一的，小伙伴们可以根据自己的需求来进行选择。

                                
                                

                                    Javascript,全局唯一标识符,guid,uuid 
                                
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