buf.writeInt8(value[, offset])

• value <integer> 要写入 buf 的数字。
• offset <integer> 开始写入之前要跳过的字节数。 必须满足 0 <= offset <= buf.length - 1。 默认值: 0。
• 返回: <integer> offset 加上写入的字节数。

将 value 写入 buf 中指定的 offset。 value 必须是有效的有符号 8 位整数。 当 value 不是有符号的 8 位整数时，则行为未定义。

value 被解释和写入为二进制补码有符号整数。

import { Buffer } from 'node:buffer';

const buf = Buffer.allocUnsafe(2);

buf.writeInt8(2, 0);
buf.writeInt8(-2, 1);

console.log(buf);
// 打印: <Buffer 02 fe>const { Buffer } = require('node:buffer');

const buf = Buffer.allocUnsafe(2);

buf.writeInt8(2, 0);
buf.writeInt8(-2, 1);

console.log(buf);
// 打印: <Buffer 02 fe>

• value <integer> Number to be written to buf.
• offset <integer> Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 1. Default: 0.
• Returns: <integer> offset plus the number of bytes written.

Writes value to buf at the specified offset. value must be a valid signed 8-bit integer. Behavior is undefined when value is anything other than a signed 8-bit integer.

value is interpreted and written as a two's complement signed integer.

import { Buffer } from 'node:buffer';

const buf = Buffer.allocUnsafe(2);

buf.writeInt8(2, 0);
buf.writeInt8(-2, 1);

console.log(buf);
// Prints: <Buffer 02 fe>const { Buffer } = require('node:buffer');

const buf = Buffer.allocUnsafe(2);

buf.writeInt8(2, 0);
buf.writeInt8(-2, 1);

console.log(buf);
// Prints: <Buffer 02 fe>