JavaScript(js)中如何快速生成随机GUID/UUID字符串呢？

7 个回答

• 0

  在JavaScript(js)中，可以使用crypto.getRandomValues()函数封装一个生成GUID/UUID随机字符串的函数，如下：

  function uuidv4() {
    return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>
      (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
    );
  }
  

  调用示例：

  console.log(uuidv4());
  

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  Rector

  2021-11-06 回答
• 0

  或者，使用Math.random()封装一个生成GUID/UUID随机字符串的函数，如下：

  function generateUUID() {
      var d = new Date().getTime();
      var d2 = ((typeof performance !== 'undefined') && performance.now && (performance.now()*1000)) || 0;
      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
          var r = Math.random() * 16;
          if(d > 0){
              r = (d + r)%16 | 0;
              d = Math.floor(d/16);
          } else {
              r = (d2 + r)%16 | 0;
              d2 = Math.floor(d2/16);
          }
          return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
      });
  }
  

  调用示例：

  console.log(generateUUID());
  

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  Rector

  2021-11-06 回答
• 0

  下面是一个进过优化的，高效的生成GUID/UUID随机字符串的函数：

  var lut = []; for (var i=0; i<256; i++) { lut[i] = (i<16?'0':'')+(i).toString(16); }
  function generateUUID()
  {
      var d0 = Math.random()*0xffffffff|0;
      var d1 = Math.random()*0xffffffff|0;
      var d2 = Math.random()*0xffffffff|0;
      var d3 = Math.random()*0xffffffff|0;
      return lut[d0&0xff]+lut[d0>>8&0xff]+lut[d0>>16&0xff]+lut[d0>>24&0xff]+'-'+
      lut[d1&0xff]+lut[d1>>8&0xff]+'-'+lut[d1>>16&0x0f|0x40]+lut[d1>>24&0xff]+'-'+
      lut[d2&0x3f|0x80]+lut[d2>>8&0xff]+'-'+lut[d2>>16&0xff]+lut[d2>>24&0xff]+
      lut[d3&0xff]+lut[d3>>8&0xff]+lut[d3>>16&0xff]+lut[d3>>24&0xff];
  }
  
  console.log(generateUUID())
  

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  Rector

  2021-11-06 回答
• 0

  或者，还可以是下面的生成GUID/UUID随机字符串的函数：

  function generateGuid() {
    var result, i, j;
    result = '';
    for(j=0; j<32; j++) {
      if( j == 8 || j == 12 || j == 16 || j == 20)
        result = result + '-';
      i = Math.floor(Math.random()*16).toString(16).toUpperCase();
      result = result + i;
    }
    return result;
  }
  

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  Rector

  2021-11-06 回答
• 0

  var uuid = function() {
      var buf = new Uint32Array(4);
      window.crypto.getRandomValues(buf);
      var idx = -1;
      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
          idx++;
          var r = (buf[idx>>3] >> ((idx%8)*4))&15;
          var v = c == 'x' ? r : (r&0x3|0x8);
          return v.toString(16);
      });
  };
  

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  Rector

  2021-11-06 回答
• 0

  function uuid()
  {
     var chars = '0123456789abcdef'.split('');
  
     var uuid = [], rnd = Math.random, r;
     uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
     uuid[14] = '4'; // version 4
  
     for (var i = 0; i < 36; i++)
     {
        if (!uuid[i])
        {
           r = 0 | rnd()*16;
  
           uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r & 0xf];
        }
     }
  
     return uuid.join('');
  }
  

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  Rector

  2021-11-06 回答
• 0

  以下是GUID对象方式的实现：

  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);
      window.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
    };
  })();
  
  // 调用示例
  console.log(Guid.newGuid()); // c6c2d12f-d76b-5739-e551-07e6de5b0807
  console.log(Guid.empty()); // 00000000-0000-0000-0000-000000000000
  

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  Rector

  2021-11-06 回答