buf.readDoubleLE([offset])

版本历史

版本	变更
v10.0.0	删除了 `noAssert` 并且不再隐式强制将偏移量强制转换为 `uint32`。
v0.11.15	新增于: v0.11.15

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: <number>

从指定 offset 处的 buf 读取 64 位小端序双精度值。

import { Buffer } from 'node:buffer';

const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);

console.log(buf.readDoubleLE(0));
// 打印: 5.447603722011605e-270
console.log(buf.readDoubleLE(1));
// 抛出 ERR_OUT_OF_RANGE。const { Buffer } = require('node:buffer');

const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);

console.log(buf.readDoubleLE(0));
// 打印: 5.447603722011605e-270
console.log(buf.readDoubleLE(1));
// 抛出 ERR_OUT_OF_RANGE。

History

Version	Changes
v10.0.0	Removed `noAssert` and no implicit coercion of the offset to `uint32` anymore.
v0.11.15	Added in: v0.11.15

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

Reads a 64-bit, little-endian double from buf at the specified offset.

import { Buffer } from 'node:buffer';

const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);

console.log(buf.readDoubleLE(0));
// Prints: 5.447603722011605e-270
console.log(buf.readDoubleLE(1));
// Throws ERR_OUT_OF_RANGE.const { Buffer } = require('node:buffer');

const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);

console.log(buf.readDoubleLE(0));
// Prints: 5.447603722011605e-270
console.log(buf.readDoubleLE(1));
// Throws ERR_OUT_OF_RANGE.