如何实现字符串与uint8Array、Buffer的互转

let uint8Array: Uint8Array = new Uint8Array([72, 101, 108, 108, 111]); 
let Buffer = buffer.from(uint8Array); 
console.log('str : ' + Buffer.toString()); // Hello 
let uint8Array1: Uint8Array = new Uint8Array([228, 189, 160, 229, 165, 189]); 
let buffer2 = buffer.from(uint8Array1); 
console.log('str : ' + buffer2.toString()); // 你好 
let textDecoder = new util.TextDecoder(); 
console.log('str : ' + textDecoder.decodeWithStream(uint8Array)); // Hello 
console.log('str : ' + textDecoder.decodeWithStream(uint8Array1)); // 你好

let str: string = "hello world"; 
let that = new util.TextEncoder(); 
let result = that.encodeInto(str); 
console.log('result' + result); 
let textDecoder = util.TextDecoder.create('utf-8', { ignoreBOM: true }); 
let res = textDecoder.decodeWithStream(result) 
console.info("result:"+ res)