HarmonyOS 鸿蒙Next Uint8Array 是什么样的一个概念呢

HarmonyOS 鸿蒙Next Uint8Array 是什么样的一个概念呢 Uint8Array 是什么样的一个概念呢：
Uint8Array转string时，这两个方法，区别在哪里呢？

Array.from(mdOutput.data).map(byte => byte.toString(16)).join('')  

// 字节流转成可理解的字符串  
public static 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;  
}