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_ELEMENTReturns a number value of the element size.4in the case of anInt32Array.Int32Array.lengthStatic length property whose value is 3. For the actual length(number of elements), seeInt32Array.prototype.length.Int32Array.nameReturns the string value of the constructor name. In the case of theInt32Arraytype:"Int32Array".Int32Array.prototypePrototype for theTypedArrayobjects.

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 alsoArray.prototype.copyWithin().Int32Array.prototype.entries()Returns a newArray Iteratorobject 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 alsoArray.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 alsoArray.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 alsoArray.prototype.filter().Int32Array.prototype.find()Returns the found value in the array, if an element in the array satisfies the provided testing function orundefinedif 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 alsoArray.prototype.findIndex().Int32Array.prototype.forEach()Calls a function for each element in the array. See alsoArray.prototype.forEach().Int32Array.prototype.includes()Determines whether a typed array includes a certain element, returningtrueorfalseas 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 alsoArray.prototype.indexOf().Int32Array.prototype.join()Joins all elements of an array into a string. See alsoArray.prototype.join().Int32Array.prototype.keys()Returns a newArray Iteratorthat 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 alsoArray.prototype.lastIndexOf().Int32Array.prototype.map()Creates a new array with the results of calling a provided function on every element in this array. See alsoArray.prototype.map().Int32Array.prototype.move()未实现Former non-standard version ofInt32Array.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 alsoArray.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 alsoArray.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 alsoArray.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 alsoArray.prototype.sort().Int32Array.prototype.subarray()Returns a newInt32Arrayfrom the given start and end element index.Int32Array.prototype.values()Returns a newArray Iteratorobject 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 alsoArray.prototype.toLocaleString().Int32Array.prototype.toString()Returns a string representing the array and its elements. See alsoArray.prototype.toString().Int32Array.prototype[@@iterator]()Returns a newArray Iteratorobject 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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