Buffer.from(buffer)

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

将传入的 buffer 数据复制到新的 Buffer 实例上。

import { Buffer } from 'node:buffer';

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

buf1[0] = 0x61;

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

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

buf1[0] = 0x61;

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

如果 buffer 不是 Buffer 或其他适用于 Buffer.from() 变体的类型，则将抛出 TypeError。

• buffer <Buffer> | <Uint8Array> An existing Buffer or Uint8Array from which to copy data.

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

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