HarmonyOS 16位随机数的方法

可参考如下代码：

aboutToAppear(): void {
    for (let i = 0; i < 16; i++) {
      console.log(this.getRandomUpperCaseLetter());
    }
  }
  //随机字母
  getRandomUpperCaseLetter() {
    const randomIndex = Math.floor(Math.random() * 26);
    const charCode = 65 + randomIndex;
    return String.fromCharCode(charCode);
  }
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