buf.writeBigInt64BE(value[, offset])

• value <bigint> 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 - 8。 默认值: 0。
• 返回: <integer> offset 加上写入的字节数。

将 value 作为大端序写入 buf 中指定的 offset。

value 被解释和写入为二进制补码有符号整数。

const buf = Buffer.allocUnsafe(8);

buf.writeBigInt64BE(0x0102030405060708n, 0);

console.log(buf);
// 打印: <Buffer 01 02 03 04 05 06 07 08>

• value <bigint> Number to be written to buf.
• offset <integer> Number of bytes to skip before starting to write. Must satisfy: 0 <= offset <= buf.length - 8. Default: 0.
• Returns: <integer> offset plus the number of bytes written.

Writes value to buf at the specified offset as big-endian.

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

const buf = Buffer.allocUnsafe(8);

buf.writeBigInt64BE(0x0102030405060708n, 0);

console.log(buf);
// Prints: <Buffer 01 02 03 04 05 06 07 08>