buf.writeUIntBE(value, offset, byteLength)

• value <integer> 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 - byteLength。
• byteLength <integer> 要写入的字节数。 必须满足 0 < byteLength <= 6。
• 返回: <integer> offset 加上写入的字节数。

将 value 的 byteLength 个字节作为大端序写入 buf 中指定的 offset。 支持最高 48 位的精度。 当 value 不是无符号整数时，则行为未定义。

const buf = Buffer.allocUnsafe(6);

buf.writeUIntBE(0x1234567890ab, 0, 6);

console.log(buf);
// 打印: <Buffer 12 34 56 78 90 ab>

• value <integer> Number to be written to buf.
• offset <integer> Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - byteLength.
• byteLength <integer> Number of bytes to write. Must satisfy 0 < byteLength <= 6.
• Returns: <integer> offset plus the number of bytes written.

Writes byteLength bytes of value to buf at the specified offset as big-endian. Supports up to 48 bits of accuracy. Behavior is undefined when value is anything other than an unsigned integer.

const buf = Buffer.allocUnsafe(6);

buf.writeUIntBE(0x1234567890ab, 0, 6);

console.log(buf);
// Prints: <Buffer 12 34 56 78 90 ab>