dataView.getFloat64
dataView.getFloat64
getFloat64()方法从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 inlittle- or big-endianformat. If false or undefined, a big-endian value is read.
返回值
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.
示例
使用getFloat64方法
var buffer = new ArrayBuffer(8
var dataview = new DataView(buffer
dataview.getFloat64(0 // 0
规范
| Specification | Status | Comment |
|---|---|---|
| Typed Array Specification | Obsolete | Superseded by ECMAScript 2015. |
| ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'DataView.prototype.getFloat64' in that specification. | Standard | Initial definition in ECMA standard. |
| ECMAScript Latest Draft (ECMA-262)The definition of 'DataView.prototype.getFloat64' in that specification. | Draft | |
浏览器兼容性
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 9.0 | (Yes) | 15.0 (15.0) | 10 | 12.1 | 5.1 |
| Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | 4.0 | (Yes) | (Yes) | 15.0 (15) | ? | 12.0 | 4.2 |
