buf.writeDoubleBE(value[, offset])

• value <number> 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 必须是 JavaScript 数字 当 value 不是 JavaScript 数字时，则行为未定义。

import { Buffer } from 'buffer';

const buf = Buffer.allocUnsafe(8);

buf.writeDoubleBE(123.456, 0);

console.log(buf);
// 打印: <Buffer 40 5e dd 2f 1a 9f be 77>const { Buffer } = require('buffer');

const buf = Buffer.allocUnsafe(8);

buf.writeDoubleBE(123.456, 0);

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

• 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. Default: 0.
• Returns: <integer> offset plus the number of bytes written.

Writes value to buf at the specified offset as big-endian. The value must be a JavaScript number. Behavior is undefined when value is anything other than a JavaScript number.

import { Buffer } from 'buffer';

const buf = Buffer.allocUnsafe(8);

buf.writeDoubleBE(123.456, 0);

console.log(buf);
// Prints: <Buffer 40 5e dd 2f 1a 9f be 77>const { Buffer } = require('buffer');

const buf = Buffer.allocUnsafe(8);

buf.writeDoubleBE(123.456, 0);

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