The Uint16Array
typed array represents an array of 16-bit unsigned 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 Uint16Array(); // ES2017 新加入的 new Uint16Array(length); new Uint16Array(typedArray); new Uint16Array(object); new Uint16Array(buffer [, byteOffset [, length]]);
获取有关构造函数语法和参数的更多信息,访问TypedArray。
属性
-
Uint16Array.BYTES_PER_ELEMENT
-
返回元素大小的数值.
2
in the case of anUint16Array
. - Uint16Array.length
-
Static length property whose value is 0. For the actual length (number of elements), see
Uint16Array.prototype.length
. -
Uint16Array.name
-
Returns the string value of the constructor name. In the case of the
Uint16Array
type: "Uint16Array". -
Uint16Array.prototype
- Prototype for the TypedArray objects.
Methods
-
Uint16Array.from()
-
Creates a new
Uint16Array
from an array-like or iterable object. See alsoArray.from()
. -
Uint16Array.of()
-
Creates a new
Uint16Array
with a variable number of arguments. See alsoArray.of()
.
Uint16Array
prototype
All Uint16Array
objects inherit from %TypedArray%.prototype
.
Properties
-
Uint16Array.prototype.constructor
-
Returns the function that created an instance's prototype. This is the
Uint16Array
constructor by default. -
Uint16Array.prototype.buffer
只读 -
Returns the
ArrayBuffer
referenced by theUint16Array
Fixed at construction time and thus read only. -
Uint16Array.prototype.byteLength
只读 -
Returns the length (in bytes) of the
Uint16Array
from the start of itsArrayBuffer
. Fixed at construction time and thus read only. -
Uint16Array.prototype.byteOffset
只读 -
Returns the offset (in bytes) of the
Uint16Array
from the start of itsArrayBuffer
. Fixed at construction time and thus read only. -
Uint16Array.prototype.length
只读 -
Returns the number of elements hold in the
Uint16Array
. Fixed at construction time and thus read only.
Methods
-
Uint16Array.prototype.copyWithin()
-
Copies a sequence of array elements within the array. See also
Array.prototype.copyWithin()
. -
Uint16Array.prototype.entries()
-
Returns a new
Array Iterator
object that contains the key/value pairs for each index in the array. See alsoArray.prototype.entries()
. -
Uint16Array.prototype.every()
-
Tests whether all elements in the array pass the test provided by a function. See also
Array.prototype.every()
. -
Uint16Array.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()
. -
Uint16Array.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()
. -
Uint16Array.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()
. -
Uint16Array.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()
. -
Uint16Array.prototype.forEach()
-
Calls a function for each element in the array. See also
Array.prototype.forEach()
. -
Uint16Array.prototype.includes()
-
Determines whether a typed array includes a certain element, returning
true
orfalse
as appropriate. See alsoArray.prototype.includes()
. -
Uint16Array.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()
. -
Uint16Array.prototype.join()
-
Joins all elements of an array into a string. See also
Array.prototype.join()
. -
Uint16Array.prototype.keys()
-
Returns a new
Array Iterator
that contains the keys for each index in the array. See alsoArray.prototype.keys()
. -
Uint16Array.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()
. -
Uint16Array.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()
. -
Uint16Array.prototype.move()
未实现 -
Former non-standard version of
Uint16Array.prototype.copyWithin()
. -
Uint16Array.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()
. -
Uint16Array.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()
. -
Uint16Array.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()
. -
Uint16Array.prototype.set()
- Stores multiple values in the typed array, reading input values from a specified array.
-
Uint16Array.prototype.slice()
-
Extracts a section of an array and returns a new array. See also
Array.prototype.slice()
. -
Uint16Array.prototype.some()
-
Returns true if at least one element in this array satisfies the provided testing function. See also
Array.prototype.some()
. -
Uint16Array.prototype.sort()
-
Sorts the elements of an array in place and returns the array. See also
Array.prototype.sort()
. -
Uint16Array.prototype.subarray()
-
Returns a new
Uint16Array
from the given start and end element index. -
Uint16Array.prototype.values()
-
Returns a new
Array Iterator
object that contains the values for each index in the array. See alsoArray.prototype.values()
. -
Uint16Array.prototype.toLocaleString()
-
Returns a localized string representing the array and its elements. See also
Array.prototype.toLocaleString()
. -
Uint16Array.prototype.toString()
-
Returns a string representing the array and its elements. See also
Array.prototype.toString()
. -
Uint16Array.prototype[@@iterator]()
-
Returns a new
Array Iterator
object that contains the values for each index in the array.
Examples
创建 Uint16Array的不同方法
:
// From a length var uint16 = new Uint16Array(2); uint16[0] = 42; console.log(uint16[0]); // 42 console.log(uint16.length); // 2 console.log(uint16.BYTES_PER_ELEMENT); // 2 // From an array var arr = new Uint16Array([21,31]); console.log(arr[1]); // 31 // From another TypedArray var x = new Uint16Array([21, 31]); var y = new Uint16Array(x); console.log(y[0]); // 21 // From an ArrayBuffer var buffer = new ArrayBuffer(8); var z = new Uint16Array(buffer, 0, 4); // From an iterable var iterable = function*(){ yield* [1,2,3]; }(); var uint16 = new Uint16Array(iterable); // Uint16Array[1, 2, 3]
Specifications
Specification | Status | Comment |
---|---|---|
Typed Array Specification | Obsolete | Superseded by ECMAScript 2015. |
ECMAScript 2015 (6th Edition, ECMA-262) TypedArray constructors |
Standard | Initial definition in an ECMA standard. Specified that new is required. |
ECMAScript Latest Draft (ECMA-262) TypedArray constructors |
Draft | ECMAScript 2017 changed the Uint16Array constructor to use the ToIndex operation and allows constructors with no arguments. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out
https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Uint16Array |
Chrome Full support 7 | Edge Full support 12 | Firefox Full support 4 | IE Full support 10 | Opera Full support 11.6 | Safari Full support 5.1 | WebView Android Full support 4 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 12 | Safari iOS Full support 4.2 | Samsung Internet Android Full support Yes | nodejs Full support 0.10 |
Constructor without arguments | Chrome Full support 7 | Edge Full support 12 | Firefox Full support 55 | IE Full support 10 | Opera Full support Yes | Safari Full support 5.1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 55 | Opera Android Full support Yes | Safari iOS Full support 5 | Samsung Internet Android Full support 1.0 | nodejs ? |
Iterable in constructor | Chrome Full support 39 | Edge Full support 14 | Firefox Full support 52 | IE No support No | Opera Full support 26 | Safari ? | WebView Android Full support 39 | Chrome Android Full support 39 | Firefox Android Full support 52 | Opera Android Full support 26 | Safari iOS ? | Samsung Internet Android Full support 4.0 | nodejs Full support 4.0.0 |
Uint16Array() without new throws |
Chrome Full support 7 | Edge Full support 14 | Firefox Full support 44 | IE No support No | Opera Full support Yes | Safari Full support 5.1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 44 | Opera Android Full support Yes | Safari iOS Full support 5 | Samsung Internet Android Full support 1.0 | nodejs Full support 0.12 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
Compatibility notes
Starting with ECMAScript 2015, Uint16Array
constructors require to be constructed with a TypeError
from now on.
var dv = Uint16Array([1, 2, 3]); // TypeError: calling a builtin Uint16Array constructor // without new is forbidden
var dv = new Uint16Array([1, 2, 3]);