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 an Int32Array .
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 also Array.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 also Array.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 or false as appropriate. See also Array.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 also Array.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 also Array.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);

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Int32Array

语法

属性

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Int32Array 属性

属性

方法

例子

`Int32Array` 属性