Int8Array
BaselineWidely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
ОбъектInt8Array
представляет типизированный массив 8-разрядных целых значений. Содержимое инициализируется значением 0. Создав экземплярInt8Array
, возможно получить доступ к элементам массива, используя методы объекта или стандартный синтаксис доступа к элементу массива по его индексу (с помощью скобочной нотации).
Syntax
new Int8Array(); // new in ES2017new Int8Array(length);new Int8Array(typedArray);new Int8Array(object);new Int8Array(buffer [, byteOffset [, length]]);
Для более детальной информации о синтаксисе конструктора смотритеTypedArray.
Properties
Int8Array.BYTES_PER_ELEMENT
Возвращает числовое значение размера элемента массива.
1
в случае сInt8Array
.- Int8Array.length
Статическая длина конструктора
Int8Array
, всегда равна3
(т.к. конструктор принимает до 3 аргументов). Чтобы узнать длину созданного массива, seeInt8Array.prototype.length
.Int8Array.name
Возвращает строчное значение имени конструктора. В случае с
Int8Array
: "Int8Array".Int8Array.prototype
Прототип дляTypedArray objects.
Methods
Int8Array.from()
Creates a new
Int8Array
from an array-like or iterable object. See alsoArray.from()
.Int8Array.of()
Creates a new
Int8Array
with a variable number of arguments. See alsoArray.of()
.
Int8Array
prototype
AllInt8Array
objects inherit from%TypedArray%.prototype
.
Properties
Int8Array.prototype.constructor
Returns the function that created an instance's prototype. This is the
Int8Array
constructor by default.Int8Array.prototype.buffer
Только для чтенияReturns the
ArrayBuffer
referenced by theInt8Array
Fixed at construction time and thusread only.Int8Array.prototype.byteLength
Только для чтенияReturns the length (in bytes) of the
Int8Array
from the start of itsArrayBuffer
. Fixed at construction time and thusread only.Int8Array.prototype.byteOffset
Только для чтенияReturns the offset (in bytes) of the
Int8Array
from the start of itsArrayBuffer
. Fixed at construction time and thusread only.Int8Array.prototype.length
Только для чтенияReturns the number of elements hold in the
Int8Array
. Fixed at construction time and thusread only.
Methods
Int8Array.prototype.copyWithin()
Copies a sequence of array elements within the array. See also
Array.prototype.copyWithin()
.Int8Array.prototype.entries()
Returns a new
Array Iterator
object that contains the key/value pairs for each index in the array. See alsoArray.prototype.entries()
.Int8Array.prototype.every()
Tests whether all elements in the array pass the test provided by a function. See also
Array.prototype.every()
.Int8Array.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()
.Int8Array.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()
.Int8Array.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()
.Int8Array.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()
.Int8Array.prototype.forEach()
Calls a function for each element in the array. See also
Array.prototype.forEach()
.Int8Array.prototype.includes()
Экспериментальная возможностьDetermines whether a typed array includes a certain element, returning
true
orfalse
as appropriate. See alsoArray.prototype.includes()
.Int8Array.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()
.Int8Array.prototype.join()
Joins all elements of an array into a string. See also
Array.prototype.join()
.Int8Array.prototype.keys()
Returns a new
Array Iterator
that contains the keys for each index in the array. See alsoArray.prototype.keys()
.Int8Array.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()
.Int8Array.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()
.Int8Array.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()
.Int8Array.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()
.Int8Array.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()
.Int8Array.prototype.set()
Stores multiple values in the typed array, reading input values from a specified array.
Int8Array.prototype.slice()
Extracts a section of an array and returns a new array. See also
Array.prototype.slice()
.Int8Array.prototype.some()
Returns true if at least one element in this array satisfies the provided testing function. See also
Array.prototype.some()
.Int8Array.prototype.sort()
Sorts the elements of an array in place and returns the array. See also
Array.prototype.sort()
.Int8Array.prototype.subarray()
Returns a new
Int8Array
from the given start and end element index.Int8Array.prototype.values()
Returns a new
Array Iterator
object that contains the values for each index in the array. See alsoArray.prototype.values()
.Int8Array.prototype.toLocaleString()
Returns a localized string representing the array and its elements. See also
Array.prototype.toLocaleString()
.Int8Array.prototype.toString()
Returns a string representing the array and its elements. See also
Array.prototype.toString()
.Int8Array.prototype[@@iterator]()
Returns a new
Array Iterator
object that contains the values for each index in the array.
Examples
Different ways to create anInt8Array
:
// From a lengthvar int8 = new Int8Array(2);int8[0] = 42;console.log(int8[0]); // 42console.log(int8.length); // 2console.log(int8.BYTES_PER_ELEMENT); // 1// From an arrayvar arr = new Int8Array([21, 31]);console.log(arr[1]); // 31// From another TypedArrayvar x = new Int8Array([21, 31]);var y = new Int8Array(x);console.log(y[0]); // 21// From an ArrayBuffervar buffer = new ArrayBuffer(8);var z = new Int8Array(buffer, 1, 4);// From an iterablevar iterable = (function* () { yield* [1, 2, 3];})();var int8 = new Int8Array(iterable);// Int8Array[1, 2, 3]
Спецификации
Specification |
---|
ECMAScript® 2026 Language Specification # sec-typedarray-objects |
Совместимость с браузерами
Compatibility notes
Starting with ECMAScript 2015,Int8Array
constructors require to be constructed with anew
operator. Calling aInt8Array
constructor as a function withoutnew
, will throw aTypeError
from now on.
var dv = Int8Array([1, 2, 3]);// TypeError: calling a builtin Int8Array constructor// without new is forbidden
var dv = new Int8Array([1, 2, 3]);