Int32Array
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);