buf.writeUInt8(value[, offset])

• value <integer> 要写入 buf 的数字。

  ¥value <integer> Number to be written to buf.

• 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。

  ¥offset <integer> Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 1. Default: 0.

• 返回：<integer> offset 加上写入的字节数。

  ¥Returns: <integer> offset plus the number of bytes written.

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

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

此函数也可在 writeUint8 别名下使用。

¥This function is also available under the writeUint8 alias.

import { Buffer } from 'node:buffer';

const buf = Buffer.allocUnsafe(4);

buf.writeUInt8(0x3, 0);
buf.writeUInt8(0x4, 1);
buf.writeUInt8(0x23, 2);
buf.writeUInt8(0x42, 3);

console.log(buf);
// Prints: <Buffer 03 04 23 42>const { Buffer } = require('node:buffer');

const buf = Buffer.allocUnsafe(4);

buf.writeUInt8(0x3, 0);
buf.writeUInt8(0x4, 1);
buf.writeUInt8(0x23, 2);
buf.writeUInt8(0x42, 3);

console.log(buf);
// Prints: <Buffer 03 04 23 42>拷贝