buf.writeIntLE(value, offset, byteLength)

• value <integer> 要写入 buf 的数字。
• offset <integer> 写入前要跳过的字节数。必须满足 0 <= offset <= buf.length - byteLength。
• byteLength <integer> 要写入的字节数。必须满足 0 < byteLength <= 6。
• 返回：<integer> offset 加上写入的字节数。

将 value 的 byteLength 字节以小端格式写入指定 offset 的 buf。支持最多 48 位精度。当 value 不是有符号整数时，行为未定义。

【Writes byteLength bytes of value to buf at the specified offset as little-endian. Supports up to 48 bits of accuracy. Behavior is undefined when value is anything other than a signed integer.】

import { Buffer } from 'node:buffer';

const buf = Buffer.allocUnsafe(6);

buf.writeIntLE(0x1234567890ab, 0, 6);

console.log(buf);
// Prints: <Buffer ab 90 78 56 34 12>const { Buffer } = require('node:buffer');

const buf = Buffer.allocUnsafe(6);

buf.writeIntLE(0x1234567890ab, 0, 6);

console.log(buf);
// Prints: <Buffer ab 90 78 56 34 12>拷贝