Int16Array
The Int16Array
typed array represents an array of twos-complement 16-bit signed integers in the platform byte order. If control over byte order is needed, use DataView
instead. The contents are initialized to 0
. 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).
语法
new Int16Array(length); new Int16Array(typedArray); new Int16Array(object); new Int16Array(buffer [, byteOffset [, length]]);
For more information about the constructor syntax and the parameters, see TypedArray.
属性
Int16Array.BYTES_PER_ELEMENT
-
Returns a number value of the element size.
2
in the case of anInt16Array
. - Int16Array.length
-
Static length property whose value is 3. For the actual length (number of elements), see
Int16Array.prototype.length
. Int16Array.prototype
(en-US)-
Prototype for the TypedArray objects.
方法
Int16Array.from()
-
Creates a new
Int16Array
from an array-like or iterable object. See alsoArray.from()
. Int16Array.of()
-
Creates a new
Int16Array
with a variable number of arguments. See alsoArray.of()
.
Int16Array
prototype
All Int16Array
objects inherit from %TypedArray%.prototype
(en-US).
Properties
Int16Array.prototype.constructor
-
Returns the function that created an instance's prototype. This is the
Int16Array
constructor by default. Int16Array.prototype.buffer
只读-
Returns the
ArrayBuffer
referenced by theInt16Array
Fixed at construction time and thus read only. Int16Array.prototype.byteLength
只读-
Returns the length (in bytes) of the
Int16Array
from the start of itsArrayBuffer
. Fixed at construction time and thus read only. Int16Array.prototype.byteOffset
只读-
Returns the offset (in bytes) of the
Int16Array
from the start of itsArrayBuffer
. Fixed at construction time and thus read only. Int16Array.prototype.length
只读-
Returns the number of elements hold in the
Int16Array
. Fixed at construction time and thus read only.
Methods
Int16Array.prototype.copyWithin()
-
Copies a sequence of array elements within the array. See also
Array.prototype.copyWithin()
. Int16Array.prototype.entries()
-
Returns a new
Array Iterator
object that contains the key/value pairs for each index in the array. See alsoArray.prototype.entries()
. Int16Array.prototype.every()
-
Tests whether all elements in the array pass the test provided by a function. See also
Array.prototype.every()
. Int16Array.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()
. Int16Array.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()
. Int16Array.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()
. Int16Array.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()
. Int16Array.prototype.forEach()
-
Calls a function for each element in the array. See also
Array.prototype.forEach()
. Int16Array.prototype.includes()
实验性-
Determines whether a typed array includes a certain element, returning
true
orfalse
as appropriate. See alsoArray.prototype.includes()
. Int16Array.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()
. Int16Array.prototype.join()
-
Joins all elements of an array into a string. See also
Array.prototype.join()
. Int16Array.prototype.keys()
-
Returns a new
Array Iterator
that contains the keys for each index in the array. See alsoArray.prototype.keys()
. Int16Array.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()
. Int16Array.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()
. Int16Array.prototype.move()
非标准 未实现-
Former non-standard version of
Int16Array.prototype.copyWithin()
. Int16Array.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()
. Int16Array.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()
. Int16Array.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()
. Int16Array.prototype.set()
-
Stores multiple values in the typed array, reading input values from a specified array.
Int16Array.prototype.slice()
-
Extracts a section of an array and returns a new array. See also
Array.prototype.slice()
. Int16Array.prototype.some()
-
Returns true if at least one element in this array satisfies the provided testing function. See also
Array.prototype.some()
. Int16Array.prototype.sort()
-
Sorts the elements of an array in place and returns the array. See also
Array.prototype.sort()
. Int16Array.prototype.subarray()
-
Returns a new
Int16Array
from the given start and end element index. Int16Array.prototype.values()
-
Returns a new
Array Iterator
object that contains the values for each index in the array. See alsoArray.prototype.values()
. Int16Array.prototype.toLocaleString()
-
Returns a localized string representing the array and its elements. See also
Array.prototype.toLocaleString()
. Int16Array.prototype.toString()
-
Returns a string representing the array and its elements. See also
Array.prototype.toString()
. Int16Array.prototype[@@iterator]()
-
Returns a new
Array Iterator
object that contains the values for each index in the array.
Examples
// From a length
var int16 = new Int16Array(2);
int16[0] = 42;
console.log(int16[0]); // 42
console.log(int16.length); // 2
console.log(int16.BYTES_PER_ELEMENT); // 2
// From an array
var arr = new Int16Array([21,31]);
console.log(arr[1]); // 31
// From another TypedArray
var x = new Int16Array([21, 31]);
var y = new Int16Array(x);
console.log(y[0]); // 21
// From an ArrayBuffer
var buffer = new ArrayBuffer(8);
var z = new Int16Array(buffer, 0, 4);
规范
Specification |
---|
ECMAScript Language Specification # table-49 |
浏览器兼容性
BCD tables only load in the browser
Compatibility notes
Starting with ECMAScript 2015, Int16Array
constructors require to be constructed with a new
operator. Calling a Int16Array
constructor as a function without new
, will throw a TypeError
from now on.
var dv = Int16Array([1, 2, 3]);
// TypeError: calling a builtin Int16Array constructor
// without new is forbidden
var dv = new Int16Array([1, 2, 3]);