唯一标识符UUID类的实现

因为用不到了，记录下

/**
 * UUID 工具类
 */
class UUIDUtils {
  /**
   * 生成一个UUID
   */
  static generate(): string {
    let uuid: string | null = null;

    if (typeof crypto === "object") {
      if (typeof crypto.randomUUID === "function") {
        uuid = crypto.randomUUID();
      } else if (
        typeof crypto.getRandomValues === "function" &&
        typeof Uint8Array === "function"
      ) {
        const callback = (c: string) => {
          const num = Number(c);
          return (
            num ^
            (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (num / 4)))
          ).toString(16);
        };
        uuid = "10000000-1000-4000-8000-100000000000".replace(
          /[018]/g,
          callback
        );
      }
    }

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

    return uuid;
  }
}