JS生成唯一id方式之UUID和NanoID

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function guid() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
        var r = Math.random() * 16 | 0,
            v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}
guid() // "a1ca0f7b-51bd-4bf3-a5d5-6a74f6adc1c7"

var _S4 = function() {
  return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1)
}

// 获取广告请求唯一ID 方式是当前时间戳+13位随机吗
export function GetsingleId() {
  var _res = (_S4() + _S4() + '-' + _S4() + '-' + _S4() + '-' + _S4() + '-' + _S4() + _S4() + _S4())
  return '_' + config.version + '_' + _res
}

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;
}
uuid() // "ffb7cefd-02cb-4853-8238-c0292cf988d5"

import { nanoid } from 'nanoid'
let  idA = nanoid() //=> "V1StGXR8_Z5jdHi6B-myT"
//也可以指定生成字符串的长度
let  idB = nanoid(5)

let urlAlphabet =
  'useandom-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict'

let nanoid = (size = 21) => {
  let id = ''
  // A compact alternative for `for (var i = 0; i < step; i++)`.
  let i = size
  while (i--) {
    // `| 0` is more compact and faster than `Math.floor()`.
    id += urlAlphabet[(Math.random() * 64) | 0]
  }
  return id
}