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Int32Array

Int32Array

Int32Array 类型数组表示在平台字节顺序中的一对双补码32位有符号整数数组。如果需要控制字节顺序, 请改用 DataView。内容初始化为0。一旦建立, 您可以使用对象的方法引用数组中的元素, 或者使用标准数组索引语法 (即使用括号表示法)。

语法

new Int32Array( // new in ES2017 new Int32Array(length new Int32Array(typedArray new Int32Array(object new Int32Array(buffer [, byteOffset [, length]]

有关构造函数语法和参数的更多信息, 请参见 TypedArray。

属性

Int32Array. BYTES_PER_ELEMENTReturns 元素大小的数值。在 Int32Array.Int32Array.lengthStatic 长度属性的情况下, 其值为0。对于实际长度 (元素数), 请参见 Int32Array.prototype.length.Int32Array.nameReturns 构造函数名称的字符串值。在 Int32Array 类型的情况下: "Int32Array"。Int32Array prototypePrototype 的 TypedArray 对象。

方法

Int32Array.from()创建一个新的 Int32Array 从类似数组或 iterable 对象。另请参见Array.from()

Int32Array prototype

所有 Int32Array 对象都从%TypedArray% 原型继承。

属性

Int32Array.prototype.constructorReturns创建实例原型的函数。这是默认情况下的 Int32Array 构造函数。

方法

Int32Array.prototype.copyWithin()复制数组中的一系列数组元素。另见Array.prototype.copyWithin()

示例

多种方式生成 Int32Array:

// From a length var int32 = new Int32Array(2 int32[0] = 42; console.log(int32[0] // 42 console.log(int32.length // 2 console.log(int32.BYTES_PER_ELEMENT // 4 // From an array var arr = new Int32Array([21,31] console.log(arr[1] // 31 // From another TypedArray var x = new Int32Array([21, 31] var y = new Int32Array(x console.log(y[0] // 21 // From an ArrayBuffer var buffer = new ArrayBuffer(16 var z = new Int32Array(buffer, 0, 4 // From an iterable var iterable = function*(){ yield* [1,2,3]; }( var int32 = new Int32Array(iterable // Int32Array[1, 2, 3]

规范

SpecificationStatusComment
Typed Array SpecificationObsoleteSuperseded by ECMAScript 2015.
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'TypedArray constructors' in that specification.StandardInitial definition in an ECMA standard. Specified that new is required.
ECMAScript Latest Draft (ECMA-262)The definition of 'TypedArray constructors' in that specification.DraftECMAScript 2017 changed the Int32Array constructor to use the ToIndex operation and allows constructors with no arguments.

浏览器兼容性

FeatureChromeEdgeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support7.0(Yes)4.0 (2)1011.65.1
new is required??44 (44)???
Iterable in constructor??52 (52)???
Constructor without arguments??55 (55)???

FeatureAndroidChrome for AndroidEdgeFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support4.0(Yes)(Yes)4.0 (2)1011.64.2
new is required???44.0 (44)???
Iterable in constructor???52.0 (52)???
Constructor without arguments???55.0 (55)???