From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../reference/global_objects/int32array/index.html | 259 +++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 files/zh-cn/web/javascript/reference/global_objects/int32array/index.html (limited to 'files/zh-cn/web/javascript/reference/global_objects/int32array') diff --git a/files/zh-cn/web/javascript/reference/global_objects/int32array/index.html b/files/zh-cn/web/javascript/reference/global_objects/int32array/index.html new file mode 100644 index 0000000000..1e7ca21cc4 --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/int32array/index.html @@ -0,0 +1,259 @@ +--- +title: Int32Array +slug: Web/JavaScript/Reference/Global_Objects/Int32Array +translation_of: Web/JavaScript/Reference/Global_Objects/Int32Array +--- +
{{JSRef}}
+ +

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{{jsxref("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

+ +
+
{{jsxref("TypedArray.BYTES_PER_ELEMENT", "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 {{jsxref("TypedArray.prototype.length", "Int32Array.prototype.length")}}.
+
{{jsxref("TypedArray.name", "Int32Array.name")}}
+
Returns the string value of the constructor name. In the case of the Int32Array type: "Int32Array".
+
{{jsxref("TypedArray.prototype", "Int32Array.prototype")}}
+
Prototype for the TypedArray objects.
+
+ +

方法

+ +
+
{{jsxref("TypedArray.from", "Int32Array.from()")}}
+
从类似数组或者可迭代对象中创建一个新的Int32Array。另见{{jsxref("Array.from()")}}.
+
{{jsxref("TypedArray.of", "Int32Array.of()")}}
+
创建一个新的具有可变数量参数的Int32Array。另见{{jsxref("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。
+
{{jsxref("TypedArray.prototype.buffer", "Int32Array.prototype.buffer")}} {{readonlyInline}}
+
返回在构造时被固定的Int32Array引用的{{jsxref("ArrayBuffer")}}，因此只读。
+
{{jsxref("TypedArray.prototype.byteLength", "Int32Array.prototype.byteLength")}} {{readonlyInline}}
+
返回从其{{jsxref("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。
+
{{jsxref("TypedArray.prototype.byteOffset", "Int32Array.prototype.byteOffset")}} {{readonlyInline}}
+
返回从其{{jsxref("ArrayBuffer")}}开始的偏移量(以字节为单位)。在构造时被固定,因此只读。
+
+ +
+
{{jsxref("TypedArray.prototype.length", "Int32Array.prototype.length")}} {{readonlyInline}}
+
     返回Int32ArrayInt32Array包含的元素个数。在构造时被固定,因此只读。
+
+ +

方法

+ +
+
{{jsxref("TypedArray.copyWithin", "Int32Array.prototype.copyWithin()")}}
+
Copies a sequence of array elements within the array. See also {{jsxref("Array.prototype.copyWithin()")}}.
+
{{jsxref("TypedArray.entries", "Int32Array.prototype.entries()")}}
+
Returns a new Array Iterator object that contains the key/value pairs for each index in the array. See also {{jsxref("Array.prototype.entries()")}}.
+
{{jsxref("TypedArray.every", "Int32Array.prototype.every()")}}
+
Tests whether all elements in the array pass the test provided by a function. See also {{jsxref("Array.prototype.every()")}}.
+
{{jsxref("TypedArray.fill", "Int32Array.prototype.fill()")}}
+
Fills all the elements of an array from a start index to an end index with a static value. See also {{jsxref("Array.prototype.fill()")}}.
+
{{jsxref("TypedArray.filter", "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 {{jsxref("Array.prototype.filter()")}}.
+
{{jsxref("TypedArray.find", "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 {{jsxref("Array.prototype.find()")}}.
+
{{jsxref("TypedArray.findIndex", "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 {{jsxref("Array.prototype.findIndex()")}}.
+
{{jsxref("TypedArray.forEach", "Int32Array.prototype.forEach()")}}
+
Calls a function for each element in the array. See also {{jsxref("Array.prototype.forEach()")}}.
+
{{jsxref("TypedArray.includes", "Int32Array.prototype.includes()")}} {{experimental_inline}}
+
Determines whether a typed array includes a certain element, returning true or false as appropriate. See also {{jsxref("Array.prototype.includes()")}}.
+
{{jsxref("TypedArray.indexOf", "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 {{jsxref("Array.prototype.indexOf()")}}.
+
{{jsxref("TypedArray.join", "Int32Array.prototype.join()")}}
+
Joins all elements of an array into a string. See also {{jsxref("Array.prototype.join()")}}.
+
{{jsxref("TypedArray.keys", "Int32Array.prototype.keys()")}}
+
Returns a new Array Iterator that contains the keys for each index in the array. See also {{jsxref("Array.prototype.keys()")}}.
+
{{jsxref("TypedArray.lastIndexOf", "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 {{jsxref("Array.prototype.lastIndexOf()")}}.
+
{{jsxref("TypedArray.map", "Int32Array.prototype.map()")}}
+
Creates a new array with the results of calling a provided function on every element in this array. See also {{jsxref("Array.prototype.map()")}}.
+
{{jsxref("TypedArray.move", "Int32Array.prototype.move()")}} {{non-standard_inline}} {{unimplemented_inline}}
+
Former non-standard version of {{jsxref("TypedArray.copyWithin", "Int32Array.prototype.copyWithin()")}}.
+
{{jsxref("TypedArray.reduce", "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 {{jsxref("Array.prototype.reduce()")}}.
+
{{jsxref("TypedArray.reduceRight", "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 {{jsxref("Array.prototype.reduceRight()")}}.
+
{{jsxref("TypedArray.reverse", "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 {{jsxref("Array.prototype.reverse()")}}.
+
{{jsxref("TypedArray.set", "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。
+
{{jsxref("TypedArray.slice", "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{{jsxref("Array.prototype.slice()")}}。
+
{{jsxref("TypedArray.some", "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{{jsxref("Array.prototype.some()")}}。
+
{{jsxref("TypedArray.sort", "Int32Array.prototype.sort()")}}
+
Sorts the elements of an array in place and returns the array. See also {{jsxref("Array.prototype.sort()")}}.
+
{{jsxref("TypedArray.subarray", "Int32Array.prototype.subarray()")}}
+
Returns a new Int32Array from the given start and end element index.
+
{{jsxref("TypedArray.values", "Int32Array.prototype.values()")}}
+
Returns a new Array Iterator object that contains the values for each index in the array. See also {{jsxref("Array.prototype.values()")}}.
+
{{jsxref("TypedArray.toLocaleString", "Int32Array.prototype.toLocaleString()")}}
+
Returns a localized string representing the array and its elements. See also {{jsxref("Array.prototype.toLocaleString()")}}.
+
{{jsxref("TypedArray.toString", "Int32Array.prototype.toString()")}}
+
Returns a string representing the array and its elements. See also {{jsxref("Array.prototype.toString()")}}.
+
{{jsxref("TypedArray.@@iterator", "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);
+
+ +

详细描述

+ + + + + + + + + + + + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('Typed Array')}}{{Spec2('Typed Array')}}已被ECMAScript 6取代.
{{SpecName('ES6', '#table-49', 'TypedArray constructors')}}{{Spec2('ES6')}}ECMA标准中的初始定义，指定需要新建。
{{SpecName('ESDraft', '#table-49', 'TypedArray constructors')}}{{Spec2('ESDraft')}} 
+ +

浏览器兼容性

+ +

{{CompatibilityTable}}

+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + +
FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari
基本支持7.0{{ CompatGeckoDesktop(2) }}1011.65.1
新 的特性{{CompatUnknown}}{{ CompatGeckoDesktop(44) }}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
基本支持4.0{{CompatVersionUnknown}}{{ CompatGeckoMobile(2) }}1011.64.2
新的特性{{CompatUnknown}}{{CompatUnknown}}{{ CompatGeckoMobile(44) }}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
+
+ +

兼容性说明

+ +

Starting with ECMAScript 2015 (ES6), In32Array constructors require to be constructed with a {{jsxref("Operators/new", "new")}} operator. Calling a Int32Array constructor as a function without new, will throw a {{jsxref("TypeError")}} from now on.

+ +
var dv = Int32Array([1, 2, 3]);
+// TypeError: calling a builtin Int32Array constructor
+// without new is forbidden
+ +
var dv = new Int32Array([1, 2, 3]);
+ +

参见

+ + -- cgit v1.2.3-54-g00ecf