buf.writeDoubleLE(value, offset)


  • value <number> 要写入 buf 的数值。
  • offset <integer> 开始写入的偏移量。必须满足0 <= offset <= buf.length - 8
  • 返回: <integer> offset 加上已写入的字节数。

用指定的字节序格式(writeDoubleBE() 写入大端序, writeDoubleLE() 写入小端序)将 value 写入到 buf 中指定的 offset 位置。 value 必须是 64 位双精度值。

const buf = Buffer.allocUnsafe(8);

buf.writeDoubleBE(123.456, 0);

console.log(buf);
// 输出: <Buffer 40 5e dd 2f 1a 9f be 77>

buf.writeDoubleLE(123.456, 0);

console.log(buf);
// 输出: <Buffer 77 be 9f 1a 2f dd 5e 40>
  • value <number> Number to be written to buf.
  • offset <integer> Number of bytes to skip before starting to write. Must satisfy 0 <= offset <= buf.length - 8.
  • Returns: <integer> offset plus the number of bytes written.

Writes value to buf at the specified offset with specified endian format (writeDoubleBE() writes big endian, writeDoubleLE() writes little endian). value should be a valid 64-bit double. Behavior is undefined when value is anything other than a 64-bit double.

const buf = Buffer.allocUnsafe(8);

buf.writeDoubleBE(123.456, 0);

console.log(buf);
// Prints: <Buffer 40 5e dd 2f 1a 9f be 77>

buf.writeDoubleLE(123.456, 0);

console.log(buf);
// Prints: <Buffer 77 be 9f 1a 2f dd 5e 40>