Node.js Buffer buf.readIntBE(offset, byteLength)用法及代码示例

buf.readIntBE(offset, byteLength)

参数

• offset <integer> 开始读取前要跳过的字节数。必须满足 0 <= offset <= buf.length - byteLength 。
• byteLength <integer> 要读取的字节数。必须满足 0 < byteLength <= 6 。
• 返回： <integer>

在指定的 offset 从 buf 读取 byteLength 字节数，并将结果解释为大端序，二进制补码有符号值，最高支持 48 位精度。

import { Buffer } from 'node:buffer';

const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);

console.log(buf.readIntBE(0, 6).toString(16));
// Prints: 1234567890ab
console.log(buf.readIntBE(1, 6).toString(16));
// Throws ERR_OUT_OF_RANGE.
console.log(buf.readIntBE(1, 0).toString(16));
// Throws ERR_OUT_OF_RANGE.const { Buffer } = require('node:buffer');

const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);

console.log(buf.readIntBE(0, 6).toString(16));
// Prints: 1234567890ab
console.log(buf.readIntBE(1, 6).toString(16));
// Throws ERR_OUT_OF_RANGE.
console.log(buf.readIntBE(1, 0).toString(16));
// Throws ERR_OUT_OF_RANGE.