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

• start <integer> 新的 Buffer 将开始的位置。默认值：0。

  ¥start <integer> Where the new Buffer will start. Default: 0.

• end <integer> 新的 Buffer 将结束的位置（不包括在内）。默认值：buf.length。

  ¥end <integer> Where the new Buffer will end (not inclusive). Default: buf.length.

• 返回：<Buffer>

  ¥Returns: <Buffer>

返回一个新的 Buffer，它引用与原始内存相同的内存，但由 start 和 end 索引进行偏移和裁剪。

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

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