JS dataview getFloat32()
getFloat32()``方法``从
DataView
相对于起始位置偏移 n 个字节处开始,获取一个32-bit数(浮点型,4个字节).
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语法
dataview.getFloat32(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 32-bit float is stored in little- or big-endian format. If false or undefined, a big-endian value is read.
返回
一个浮点型32位数.
抛出错误
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.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Typed Array Specification | Obsolete | Superseded by ECMAScript 6.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 |