该 Int32Array
类型表示在平台顺序字节中一个双补码32位有符号的整型数组。如果需要控制字节顺序,请改用DataView
。此内容的初始化为0
。一旦创建,你可以使用对象的方法或者标准数组索引的语法(即使用括号表示法)。
语法
new Int32Array(length); new Int32Array(typedArray); new Int32Array(object); new Int32Array(buffer [, byteOffset [, length]]);
更多关于构造函数语法和参数的详细信息,请参阅TypedArray。
属性
-
Int32Array.BYTES_PER_ELEMENT
-
Returns a number value of the element size.
4
in the case of anInt32Array
. - Int32Array.length
-
Static length property whose value is 3. For the actual length (number of elements), see
Int32Array.prototype.length
. -
Int32Array.name
-
Returns the string value of the constructor name. In the case of the
Int32Array
type: "Int32Array". -
Int32Array.prototype
- Prototype for the TypedArray objects.
方法
-
Int32Array.from()
-
从类似数组或者可迭代对象中创建一个新的
Int32Array
。另见Array.from()
. -
Int32Array.of()
-
创建一个新的具有可变数量参数的
Int32Array
。另见Array.of()
。
Int32Array
属性
所有的Int32Array
对象都继承自{jsxref("TypedArray.prototype", "%TypedArray%.prototype")}}。
属性
-
Int32Array.prototype.constructor
-
返回创建实例原型的函数。默认情况下,它是
Int32Array
的构造函数。 -
Int32Array.prototype.buffer
只读 -
返回在构造时被固定的
Int32Array
引用的ArrayBuffer
,因此只读。 -
Int32Array.prototype.byteLength
只读 -
返回从其
ArrayBuffer
开始的Int32Array
长度的(以字节为单位)。在构造时被固定,因此只读。 -
Int32Array.prototype.byteOffset
只读 -
返回从其
ArrayBuffer
开始的偏移量(以字节为单位)。在构造时被固定,因此只读。
-
Int32Array.prototype.length
只读 -
返回
Int32ArrayInt32Array
包含的元素个数。在构造时被固定,因此只读。
方法
-
Int32Array.prototype.copyWithin()
-
Copies a sequence of array elements within the array. See also
Array.prototype.copyWithin()
. -
Int32Array.prototype.entries()
-
Returns a new
Array Iterator
object that contains the key/value pairs for each index in the array. See alsoArray.prototype.entries()
. -
Int32Array.prototype.every()
-
Tests whether all elements in the array pass the test provided by a function. See also
Array.prototype.every()
. -
Int32Array.prototype.fill()
-
Fills all the elements of an array from a start index to an end index with a static value. See also
Array.prototype.fill()
. -
Int32Array.prototype.filter()
-
Creates a new array with all of the elements of this array for which the provided filtering function returns true. See also
Array.prototype.filter()
. -
Int32Array.prototype.find()
-
Returns the found value in the array, if an element in the array satisfies the provided testing function or
undefined
if not found. See alsoArray.prototype.find()
. -
Int32Array.prototype.findIndex()
-
Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. See also
Array.prototype.findIndex()
. -
Int32Array.prototype.forEach()
-
Calls a function for each element in the array. See also
Array.prototype.forEach()
. -
Int32Array.prototype.includes()
-
Determines whether a typed array includes a certain element, returning
true
orfalse
as appropriate. See alsoArray.prototype.includes()
. -
Int32Array.prototype.indexOf()
-
Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. See also
Array.prototype.indexOf()
. -
Int32Array.prototype.join()
-
Joins all elements of an array into a string. See also
Array.prototype.join()
. -
Int32Array.prototype.keys()
-
Returns a new
Array Iterator
that contains the keys for each index in the array. See alsoArray.prototype.keys()
. -
Int32Array.prototype.lastIndexOf()
-
Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. See also
Array.prototype.lastIndexOf()
. -
Int32Array.prototype.map()
-
Creates a new array with the results of calling a provided function on every element in this array. See also
Array.prototype.map()
. -
Int32Array.prototype.move()
未实现 -
Former non-standard version of
Int32Array.prototype.copyWithin()
. -
Int32Array.prototype.reduce()
-
Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value. See also
Array.prototype.reduce()
. -
Int32Array.prototype.reduceRight()
-
Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. See also
Array.prototype.reduceRight()
. -
Int32Array.prototype.reverse()
-
Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. See also
Array.prototype.reverse()
. -
Int32Array.prototype.set()
- 在类型化数组中存储多个值,从指定数组中读取输入值。
-
Int32Array.prototype.slice()
-
提取数组中的一部分,并返回一个新的数组.更多请见
Array.prototype.slice()
。 -
Int32Array.prototype.some()
-
如果数组中至少有一个元素满足所提供的测试函数,则返回true。更多请见
Array.prototype.some()
。 -
Int32Array.prototype.sort()
-
Sorts the elements of an array in place and returns the array. See also
Array.prototype.sort()
. -
Int32Array.prototype.subarray()
-
Returns a new
Int32Array
from the given start and end element index. -
Int32Array.prototype.values()
-
Returns a new
Array Iterator
object that contains the values for each index in the array. See alsoArray.prototype.values()
. -
Int32Array.prototype.toLocaleString()
-
Returns a localized string representing the array and its elements. See also
Array.prototype.toLocaleString()
. -
Int32Array.prototype.toString()
-
Returns a string representing the array and its elements. See also
Array.prototype.toString()
. -
Int32Array.prototype[@@iterator]()
-
Returns a new
Array Iterator
object that contains the values for each index in the array.
例子
不同的方式创建一个 Int32Array
// 从一个数字 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 // 从一个数组 var arr = new Int32Array([21,31]); console.log(arr[1]); // 31 // 从一个其他TypedArray var x = new Int32Array([21, 31]); var y = new Int32Array(x); console.log(y[0]); // 21 // 从一个ArrayBuffer var buffer = new ArrayBuffer(16); var z = new Int32Array(buffer, 0, 4);
详细描述
Specification | Status | Comment |
---|---|---|
Typed Array Specification | Obsolete | 已被ECMAScript 6取代. |
ECMAScript 2015 (6th Edition, ECMA-262) TypedArray constructors |
Standard | ECMA标准中的初始定义,指定需要新建。 |
ECMAScript Latest Draft (ECMA-262) TypedArray constructors |
Draft |
浏览器兼容性
We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains.
Find out how you can help!
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
基本支持 | 7.0 | 4.0 (2) | 10 | 11.6 | 5.1 |
新 的特性 | ? | 44 (44) | ? | ? | ? |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
基本支持 | 4.0 | (Yes) | 4.0 (2) | 10 | 11.6 | 4.2 |
新 的特性 |
? | ? | 44.0 (44) | ? | ? | ? |
兼容性说明
Starting with ECMAScript 2015 (ES6), In32Array
constructors require to be constructed with a TypeError
from now on.
var dv = Int32Array([1, 2, 3]); // TypeError: calling a builtin Int32Array constructor // without new is forbidden
var dv = new Int32Array([1, 2, 3]);