Uint32Array

概要

Uint32Array 表示一个32位的无符号的整数数组，以字节的形式。 如果需要以字节的形式操作，使用{jsxref("DataView")}}代替。 内容初始化为0。 一旦创建，你可以用对象的方法引用数组里的元素，或者使用标准的数组index语法（即，使用中括号）。

语法

Uint32Array(length);
Uint32Array(typedArray);
Uint32Array(object);
Uint32Array(buffer [, byteOffset [, length]]);

更多的构造器语法和属性请参照 TypedArray。

属性

Uint32Array.BYTES_PER_ELEMENT

返回一个number类型的值，表示元素的size。 Uint32Array 返回4。

Uint32Array.length

长度属性，它的值是3。

Uint32Array.name

返回字符串类型的值，表示构造器的名字。Uint32Array 的返回值是: "Uint32Array"。

Uint32Array.prototype

返回 TypedArray 对象的原型链。

Methods

Uint32Array.from()

参考Array.from()。 未完成，请参考bug 896608。

Uint32Array.of()

参考Array.of()。未完成，请参考 bug 896608.

Uint32Array prototype

所有Uint32Array 对象继承自 %TypedArray%.prototype.

Properties

Uint32Array.prototype.constructor

返回创建实例原型的函数。 默认返回 Uint32Array 的构造器。

Uint32Array.prototype.buffer 只读

Returns the ArrayBuffer referenced by the Uint32Array Fixed at construction time and thus read only.

Uint32Array.prototype.byteLength 只读

Returns the length (in bytes) of the Uint32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.

Uint32Array.prototype.byteOffset 只读

Returns the offset (in bytes) of the Uint32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.

Uint32Array.prototype.length 只读

Returns the number of elements hold in the Uint32Array. Fixed at construction time and thus read only.

Methods

Uint32Array.prototype.copyWithin()

See Array.prototype.copyWithin().

Uint32Array.prototype.move() 未实现

Former non-standard version of Uint32Array.prototype.copyWithin().

Uint32Array.prototype.set()

Stores multiple values in the Uint32Array, reading input values from a specified array.

Uint32Array.prototype.subarray()

Returns a new Uint32Array from the given start and end element index.

Examples

// From a length
var uint32 = new Uint32Array(2);
uint32[0] = 42;
console.log(uint32[0]); // 42
console.log(uint32.length); // 2
console.log(uint32.BYTES_PER_ELEMENT); // 4

// From an array
var arr = new Uint32Array([21,31]);
console.log(arr[1]); // 31

// From another TypedArray
var x = new Uint32Array([21, 31]);
var y = new Uint32Array(x);
console.log(y[0]); // 21

// From an ArrayBuffer
var buffer = new ArrayBuffer(16);
var z = Uint32Array(buffer, 0, 4);

Specifications

Browser compatibility

See also

• JavaScript typed arrays
• ArrayBuffer
• DataView