DataView.prototype.setFloat32()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
setFloat32() 从 DataView起始位置以 byte 为计数的指定偏移量 (byteOffset) 处储存一个 32-bit 数 (浮点型)。
尝试一下
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);
const view = new DataView(buffer);
view.setFloat32(1, Math.PI);
console.log(view.getFloat32(1));
// Expected output: 3.1415927410125732
语法
dataview.setFloat32(byteOffset, value [, littleEndian])
参数
- byteOffset
-
偏移量，从头开始计算，单位为字节。
- value
-
设置的数值。
- 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 written.
返回
抛出错误
RangeError-
如果 byteOffset 超出了视图能储存的值，就会抛出错误。
示例
js
var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.setFloat32(1, 3);
dataview.getFloat32(1); // 3
规范
| Specification |
|---|
| ECMAScript® 2025 Language Specification # sec-dataview.prototype.setfloat32 |