我正在使用下面的功能:

function NewGuid()
{
    var sGuid = "";
    for (var i=0; i<32; i++)
    {
        sGuid += Math.floor(Math.random()*0xF).toString(0xF);
    }
    return sGuid;
}

简单的JavaScript作为这个问题的最佳答案的组合。

var crypto = window.crypto || window.msCrypto || null; // IE11 fix var Guid = Guid || (function() { var EMPTY = '00000000-0000-0000-0000-000000000000'; var _padLeft = function(paddingString, width, replacementChar) { return paddingString.length >= width ? paddingString : _padLeft(replacementChar + paddingString, width, replacementChar || ' '); }; var _s4 = function(number) { var hexadecimalResult = number.toString(16); return _padLeft(hexadecimalResult, 4, '0'); }; var _cryptoGuid = function() { var buffer = new window.Uint16Array(8); crypto.getRandomValues(buffer); return [_s4(buffer[0]) + _s4(buffer[1]), _s4(buffer[2]), _s4(buffer[3]), _s4(buffer[4]), _s4(buffer[5]) + _s4(buffer[6]) + _s4(buffer[7])].join('-'); }; var _guid = function() { var currentDateMilliseconds = new Date().getTime(); return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(currentChar) { var randomChar = (currentDateMilliseconds + Math.random() * 16) % 16 | 0; currentDateMilliseconds = Math.floor(currentDateMilliseconds / 16); return (currentChar === 'x' ? randomChar : (randomChar & 0x7 | 0x8)).toString(16); }); }; var create = function() { var hasCrypto = crypto != 'undefined' && crypto !== null, hasRandomValues = typeof(window.crypto.getRandomValues) != 'undefined'; return (hasCrypto && hasRandomValues) ? _cryptoGuid() : _guid(); }; return { newGuid: create, empty: EMPTY }; })(); // DEMO: Create and show GUID console.log('1. New Guid: ' + Guid.newGuid()); // DEMO: Show empty GUID console.log('2. Empty Guid: ' + Guid.empty);

使用:

主持人( )

“c6c2d12f-d76b-5739-e551-07e6de5b0807”

公平 公平

“00000000-0000-0000-0000-00000000”

不要使用 Math.random 在任何情况下,因为它产生一个非加密的随机数字来源。

下面的解决方案使用crypto.getRandomValues

function uuidv4() {
  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (c) => {
    // tslint:disable-next-line: no-bitwise
    const r =
      (window.crypto.getRandomValues(new Uint32Array(1))[0] *
        Math.pow(2, -32) * 16) |
      0;
    // tslint:disable-next-line: no-bitwise
    const v = c === "x" ? r : (r & 0x3) | 0x8;
    return v.toString(16);
  });
}

此链接有助于您了解由 Fortify Scanner 投下的不安全的随机性。

  // RFC 4122
  //
  // A UUID is 128 bits long
  //
  // String representation is five fields of 4, 2, 2, 2, and 6 bytes.
  // Fields represented as lowercase, zero-filled, hexadecimal strings, and
  // are separated by dash characters
  //
  // A version 4 UUID is generated by setting all but six bits to randomly
  // chosen values
  var uuid = [
    Math.random().toString(16).slice(2, 10),
    Math.random().toString(16).slice(2, 6),

    // Set the four most significant bits (bits 12 through 15) of the
    // time_hi_and_version field to the 4-bit version number from Section
    // 4.1.3
    (Math.random() * .0625 /* 0x.1 */ + .25 /* 0x.4 */).toString(16).slice(2, 6),

    // Set the two most significant bits (bits 6 and 7) of the
    // clock_seq_hi_and_reserved to zero and one, respectively
    (Math.random() * .25 /* 0x.4 */ + .5 /* 0x.8 */).toString(16).slice(2, 6),

    Math.random().toString(16).slice(2, 14)].join('-');

最好的方式:

function(
  a, b               // Placeholders
){
  for(               // Loop :)
      b = a = '';    // b - result , a - numeric variable
      a++ < 36;      //
      b += a*51&52   // If "a" is not 9 or 14 or 19 or 24
                  ?  //  return a random number or 4
           (
               a^15              // If "a" is not 15,
                  ?              // generate a random number from 0 to 15
               8^Math.random() *
               (a^20 ? 16 : 4)   // unless "a" is 20, in which case a random number from 8 to 11,
                  :
               4                 //  otherwise 4
           ).toString(16)
                  :
         '-'                     //  In other cases, (if "a" is 9,14,19,24) insert "-"
      );
  return b
 }

最小化:

function(a,b){for(b=a='';a++<36;b+=a*51&52?(a^15?8^Math.random()*(a^20?16:4):4).toString(16):'-');return b}

它只是扩展 Uint8Array 类型的一个例子,并使用 crypto.getRandomValues() 来产生 UUID 比特值。

class uuid extends Uint8Array {
    constructor() {
        super(16)
        /* Not v4, just some random bytes */
        window.crypto.getRandomValues(this)
    }
    toString() {
        let id = new String()
        for (let i = 0; i < this.length; i++) {
            /* Convert uint8 to hex string */
            let hex = this[i].toString(16).toUpperCase()

            /* Add zero padding */
            while (hex.length < 2) {
                hex = String(0).concat(hex)
            }
            id += hex

            /* Add dashes */
            if (i == 4 || i == 6 || i == 8 || i == 10 || i == 16) {
                id += '-'
            }
        }
        return id
    }
}