getFloat32()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32-bit数(浮点型).

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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

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.getFloat32(1); // 0

规范

浏览器支持

另见

• DataView
• ArrayBuffer