buf.readBigUInt64BE([offset])

• offset <integer> 开始读取之前要跳过的字节数。 必须满足：0 <= offset <= buf.length - 8。 默认值: 0。
• 返回: <bigint>

从指定的 offset 处的 buf 读取无符号的大端序 64 位整数。

const buf = Buffer.from([0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);

console.log(buf.readBigUInt64BE(0));
// 打印: 4294967295n

• offset <integer> Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8. Default: 0.
• Returns: <bigint>

Reads an unsigned, big-endian 64-bit integer from buf at the specified offset.

const buf = Buffer.from([0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);

console.log(buf.readBigUInt64BE(0));
// Prints: 4294967295n