MDN’s new design is in Beta! A sneak peek: https://blog.mozilla.org/opendesign/mdns-new-design-beta/

DataView.prototype.getFloat64()

getFloat64()方法DataView起始位置以byte为计数的指定偏移量(byteOffset)处获取一个64-bit数(双精度浮点型).

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Typed Array Specification Obsolete Superseded by ECMAScript 6.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 2017 Draft (ECMA-262)
DataView.prototype.getFloat64
Draft  

浏览器支持

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9.0 15.0 (15.0) 10 12.1 5.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 4.0 (Yes) 15.0 (15) ? 12.0 4.2

另见

文档标签和贡献者

 此页面的贡献者: Taoja
 最后编辑者: Taoja,