HarmonyOS ArkTS实现Uint8Array类型转Map有问题

代码如下：

const temp = 'eyJ0aW1lc3RhbXAiOiIxNzE5NTgzMjk4MDA3IiwiY2hhbGxlbmdlIjoicXpRaFBvbkdkR2FmVDc2d2dBTmFuUnc2UTE4WE0wengtZUdRNlNPb1Z3bmh2X1kiICwiZG93bmxvYWRDZXIiOiAidHJ1ZSIsInVzZXJWZXJpZmljYXRpb24iOiIyIiAsImRldmljZUlEIjoibWF0ZTMwdGVzdCIgLCJhdXRoVHlwZSI6ImF1dGgiICwiYWRkVXZpIjoibnVsbCIgLCJtb2RlbE51bWJlciI6Im51bGwiIH0'

this.serverData = await this.genClientExts(temp);

private async genClientExts( temp:string): Promise<string> {
  let  base64 = new util.Base64Helper();
  // let exts: ArrayList<Extension> = new ArrayList<Extension>();
  let data:Uint8Array = await base64.decode(temp);
  let serverData = uint8ArrayToString(data); // serverData缺少右花括号
  return serverData;
}

function uint8ArrayToString(array: Uint8Array) {
  // 将UTF-8编码转换成Unicode编码
  let out: string = "";
  let index: number = 0;
  let len: number = array.length;
  while (index < len) {
    let character = array[index++];
    switch(character >> 4) {
      case 0:
      case 1:
      case 2:
      case 3:
      case 4:
      case 5:
      case 6:
      case 7:
        out += String.fromCharCode(character);
        break;
      case 12:
      case 13:
        out += String.fromCharCode(((character & 0x1F) << 6) | (array[index++] & 0x3F));
        break;
      case 14:
        out += String.fromCharCode(((character & 0x0F) << 12) | ((array[index++] & 0x3F) << 6) | ((array[index++] & 0x3F) << 0));
        break;
      default:
        break;
    }
  }
  return out;
}