getFloat32()
方法从相对于DataView
的起始位置偏移 n 个字节处获取一个32-bit浮点数(单精度浮点数,4个字节).
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
语法
dataview.getFloat32(byteOffset [, littleEndian])
参数
- byteOffset
- 偏移量, 单位为字节, 为从视图的开始位置到读取数值的位置的偏移。
- littleEndian
- 可选 表示这个32位浮点数是否以 little- or big-endian 格式存储,如果设置为 false 或者不指定,将用big-endian格式读取数值。
返回
- 一个带符号的32位浮点数。
抛出错误
-
RangeError
- 如果byteOffset 设置导致读数值时超出了视图的末尾就会抛出错误。
说明
- 没有对齐约束; 多字节值可以从任何偏移处获取。
例子
var buffer = new ArrayBuffer(8); var dataview = new DataView(buffer); dataview.getFloat32(1); // 0
规范
Specification | Status | Comment |
---|---|---|
Typed Array Specification | Obsolete | Superseded by ECMAScript 6. |
ECMAScript 2015 (6th Edition, ECMA-262) DataView.prototype.getFloat32 |
Standard | Initial definition in an ECMA standard. |
ECMAScript Latest Draft (ECMA-262) DataView.prototype.getFloat32 |
Draft |
浏览器支持
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.
Update compatibility data on GitHub
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
getFloat32 |
Chrome Full support 9 | Edge Full support 12 | Firefox Full support 15 | IE Full support 10 | Opera Full support 12.1 | Safari Full support 5.1 | WebView Android Full support 4 | Chrome Android Full support 18 | Firefox Android Full support 15 | Opera Android Full support 12.1 | Safari iOS Full support 4.2 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
Legend
- Full support
- Full support