静态方法：Buffer.from(buffer)

【Static method: Buffer.from(buffer)】

• buffer <Buffer> | <Uint8Array> 要从中复制数据的现有 Buffer 或 Uint8Array。
• 返回：<Buffer>

将传入的 buffer 数据复制到一个新的 Buffer 实例中。

【Copies the passed buffer data onto a new Buffer instance.】

import { Buffer } from 'node:buffer';

const buf1 = Buffer.from('buffer');
const buf2 = Buffer.from(buf1);

buf1[0] = 0x61;

console.log(buf1.toString());
// Prints: auffer
console.log(buf2.toString());
// Prints: bufferconst { Buffer } = require('node:buffer');

const buf1 = Buffer.from('buffer');
const buf2 = Buffer.from(buf1);

buf1[0] = 0x61;

console.log(buf1.toString());
// Prints: auffer
console.log(buf2.toString());
// Prints: buffer拷贝

如果 buffer 不是 Buffer 或适用于 Buffer.from() 变体的其他类型，则会抛出 TypeError。

【A TypeError will be thrown if buffer is not a Buffer or another type appropriate for Buffer.from() variants.】