buf.slice([start[, end]])

• start <integer> 新的 Buffer 将从此处开始。默认值： 0。
• end <integer> 新的 Buffer 将在此结束（不包括在内）。默认值： buf.length。
• 返回：<Buffer>

返回一个新的 Buffer，它引用与原始缓冲区相同的内存，但通过 start 和 end 索引进行了偏移和裁剪。

【Returns a new Buffer that references the same memory as the original, but offset and cropped by the start and end indices.】

此方法与 Uint8Array.prototype.slice() 不兼容，Uint8Array.prototype.slice() 是 Buffer 的超类。若要复制切片，请使用 Uint8Array.prototype.slice()。

【This method is not compatible with the Uint8Array.prototype.slice(), which is a superclass of Buffer. To copy the slice, use Uint8Array.prototype.slice().】

import { Buffer } from 'node:buffer';

const buf = Buffer.from('buffer');

const copiedBuf = Uint8Array.prototype.slice.call(buf);
copiedBuf[0]++;
console.log(copiedBuf.toString());
// Prints: cuffer

console.log(buf.toString());
// Prints: buffer

// With buf.slice(), the original buffer is modified.
const notReallyCopiedBuf = buf.slice();
notReallyCopiedBuf[0]++;
console.log(notReallyCopiedBuf.toString());
// Prints: cuffer
console.log(buf.toString());
// Also prints: cuffer (!)const { Buffer } = require('node:buffer');

const buf = Buffer.from('buffer');

const copiedBuf = Uint8Array.prototype.slice.call(buf);
copiedBuf[0]++;
console.log(copiedBuf.toString());
// Prints: cuffer

console.log(buf.toString());
// Prints: buffer

// With buf.slice(), the original buffer is modified.
const notReallyCopiedBuf = buf.slice();
notReallyCopiedBuf[0]++;
console.log(notReallyCopiedBuf.toString());
// Prints: cuffer
console.log(buf.toString());
// Also prints: cuffer (!)拷贝