Float16Array

Float16Array 类型数组表示平台字节顺序中的 16 位浮点数数组。如果需要控制字节顺序,请使用 DataView。除非明确提供初始化数据,否则内容将初始化为 0。一旦建立,你可以使用对象的方法或使用标准数组索引语法(即使用括号表示法)来引用数组中的元素。

¥The Float16Array typed array represents an array of 16-bit floating point numbers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0 unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

Float16Array 是隐藏 TypedArray 类的子类。

¥Float16Array is a subclass of the hidden TypedArray class.

注意:Float16 支持不是通用的,无论是在 JavaScript API 中还是在底层 CPU 架构中。使用它可能会导致某些平台的性能下降。它旨在与高度优化和性能敏感的系统交互,例如 浮动画布、WebGPU、WebGL 和深度学习模型(包括 稳定扩散)。

¥Note: Float16 support is not universal, both in the JavaScript API and the underlying CPU architecture. Using it may result in slower performance on some platforms. It is intended for interacting with highly optimized and performance-sensitive systems such as float-backed canvases, WebGPU, WebGL, and deep learning models including stable diffusion.

构造函数

¥Constructor

Float16Array()

创建一个新的 Float16Array 对象。

静态属性

¥Static properties

还从其父级 TypedArray 继承静态属性。

¥Also inherits static properties from its parent TypedArray.

Float16Array.BYTES_PER_ELEMENT

返回元素大小的数值。2Float16Array 的情况下。

静态方法

¥Static methods

从其父级 TypedArray 继承静态方法。

¥Inherits static methods from its parent TypedArray.

实例属性

¥Instance properties

还从其父级 TypedArray 继承实例属性。

¥Also inherits instance properties from its parent TypedArray.

这些属性在 Float16Array.prototype 上定义并由所有 Float16Array 实例共享。

¥These properties are defined on Float16Array.prototype and shared by all Float16Array instances.

Float16Array.prototype.BYTES_PER_ELEMENT

返回元素大小的数值。如果是 Float16Array,则为 2

Float16Array.prototype.constructor

创建实例对象的构造函数。对于 Float16Array 实例,初始值为 Float16Array 构造函数。

实例方法

¥Instance methods

从其父级 TypedArray 继承实例方法。

¥Inherits instance methods from its parent TypedArray.

示例

¥Examples

创建 Float16Array 的不同方法

¥Different ways to create a Float16Array

js
// From a length
const float16 = new Float16Array(2);
float16[0] = 42;
console.log(float16[0]); // 42
console.log(float16.length); // 2
console.log(float16.BYTES_PER_ELEMENT); // 2

// From an array
const x = new Float16Array([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Float16Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(32);
const z = new Float16Array(buffer, 4, 4);
console.log(z.byteOffset); // 4

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const float16FromIterable = new Float16Array(iterable);
console.log(float16FromIterable);
// Float16Array [1, 2, 3]

规范

Specification
Float16Array
# sec-float16array

¥Specifications

浏览器兼容性

BCD tables only load in the browser

¥Browser compatibility

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