buf.readUIntBE(offset, byteLength)

• offset <integer> 开始读取之前要跳过的字节数。 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>

从指定的 offset 处的 buf 读取 byteLength 个字节，并将结果解释为支持最高 48 位精度的无符号大端序整数。

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

console.log(buf.readUIntBE(0, 6).toString(16));
// 打印: 1234567890ab
console.log(buf.readUIntBE(1, 6).toString(16));
// 抛出 ERR_OUT_OF_RANGE。

• offset <integer> Number of bytes to skip before starting to read. Must satisfy 0 <= offset <= buf.length - byteLength.
• byteLength <integer> Number of bytes to read. Must satisfy 0 < byteLength <= 6.
• Returns: <integer>

Reads byteLength number of bytes from buf at the specified offset and interprets the result as an unsigned big-endian integer supporting up to 48 bits of accuracy.

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

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