uuid

uuid() {
  let s = [];
  let hexDigits = "0123456789abcdef";
  for (let 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] = "-";
  return s.join("");
}

/**
 * 生成32位Guid
 * @returns {string}
 * @constructor
 */
static guid(prefix = "") {
    let timestamp = new Date().getTime();
    return prefix + 'xxxxxxxxxxxx4xxxyxxxxxxxxxxxxxxx'.substr(prefix.length).replace(/[xy]/g, function (c) {
        const r = (timestamp + Math.random() * 16) % 16 | 0;
        timestamp = Math.floor(timestamp / 16);
        return (c === 'x' ? r : (r & 3 | 8)).toString(16);
    });
}

/**
 * 生成随机数
 * @returns {string}
 * @constructor
 */
static random(length = 32) {
    let timestamp = Date.now();
    return new Array(length).fill("").map((item, index) => {
        const random = (timestamp + Math.random() * 16) % 16 | 0;
        timestamp = Math.floor(timestamp / 16);
        return (index % 2 === 1 ? random : (random & 3 | 8)).toString(16);
    }).join("");
}