DataView.prototype.getFloat64() - JavaScript 编辑

getFloat64()方法从DataView相对于起始位置偏移 n 个字节处开始，获取一个64-bit数(双精度浮点型，8个字节).

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语法

dataview.getFloat64(byteOffset [, littleEndian])

参数

byteOffset

偏移量, 单位为字节, 从头开始计算.

littleEndian

可选 Indicates whether the 64-bit float is stored in little- or big-endian format. If false or undefined, a big-endian value is read.

返回

一个双精度浮点型64位数.

抛出错误

RangeError

如果byteOffset超出了视图能储存的值，就会抛出错误.

描述

没有对齐约束; 多字节值可以从任何偏移量获取.

例子

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.getFloat64(1); // 0

规范

Specification	Status	Comment
Typed Array Specification	Obsolete	Superseded by ECMAScript 6.
ECMAScript 2015 (6th Edition, ECMA-262) DataView.prototype.getFloat64	Standard	Initial definition in ECMA standard.
ECMAScript (ECMA-262) DataView.prototype.getFloat64	Living Standard

浏览器支持

BCD tables only load in the browser

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

另见

• DataView
• ArrayBuffer