From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../global_objects/biguint64array/index.html | 164 +++++++++++++++++++++ 1 file changed, 164 insertions(+) create mode 100644 files/zh-cn/web/javascript/reference/global_objects/biguint64array/index.html (limited to 'files/zh-cn/web/javascript/reference/global_objects/biguint64array/index.html') diff --git a/files/zh-cn/web/javascript/reference/global_objects/biguint64array/index.html b/files/zh-cn/web/javascript/reference/global_objects/biguint64array/index.html new file mode 100644 index 0000000000..b689fe581e --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/biguint64array/index.html @@ -0,0 +1,164 @@ +--- +title: BigUint64Array +slug: Web/JavaScript/Reference/Global_Objects/BigUint64Array +translation_of: Web/JavaScript/Reference/Global_Objects/BigUint64Array +--- +
 {{JSRef}}
+ +

BigUint64Array 类型数组表示一个平台字节顺序的64位无符号整型数组。如果想要控制字符顺序，请使用 {{jsxref("DataView")}} 替代。内容初始化为 0n. 创建之后可以使用对象中的方法或使用标准数组索引语法(括号表示法)来获取数组中的元素。

+ +

句法

+ +
new BigUint64Array();
+new BigUint64Array(length);
+new BigUint64Array(typedArray);
+new BigUint64Array(object);
+new BigUint64Array(buffer [, byteOffset [, length]]);
+ +

更多有关构造方法和参数的信息，参见 TypedArray.

+ +

属性

+ +
+
{{jsxref("TypedArray.BYTES_PER_ELEMENT", "BigUint64Array.BYTES_PER_ELEMENT")}}
+
返回一个元素容量的数字值. 8 in the case of a BigUint64Array.
+
BigUint64Array.length
+
Static length property whose value is 3. For the actual length (number of elements), see {{jsxref("TypedArray.prototype.length", "BigUint64Array.prototype.length")}}.
+
{{jsxref("TypedArray.name", "BigUint64Array.name")}}
+
Returns the string value of the constructor name. In the case of the BigUint64Array type: "BigUint64Array".
+
{{jsxref("TypedArray.prototype", "BigUint64Array.prototype")}}
+
Prototype for the TypedArray objects.
+
+ +

Methods

+ +
+
{{jsxref("TypedArray.from", "BigUint64Array.from()")}}
+
Creates a new BigUint64Array from an array-like or iterable object. See also {{jsxref("Array.from()")}}.
+
{{jsxref("TypedArray.of", "BigUint64Array.of()")}}
+
Creates a new BigUint64Array with a variable number of arguments. See also {{jsxref("Array.of()")}}.
+
+ +

BigUint64Array prototype

+ +

All BigUint64Array objects inherit from {{jsxref("TypedArray.prototype", "%TypedArray%.prototype")}}.

+ +

Properties

+ +
+
BigUint64Array.prototype.constructor
+
Returns the function that created an instance's prototype. This is the BigUint64Array constructor by default.
+
{{jsxref("TypedArray.prototype.buffer", "BigUint64Array.prototype.buffer")}} {{readonlyInline}}
+
Returns the {{jsxref("ArrayBuffer")}} referenced by the BigUint64Array. Fixed at construction time and thus read only.
+
{{jsxref("TypedArray.prototype.byteLength", "BigUint64Array.prototype.byteLength")}} {{readonlyInline}}
+
Returns the length (in bytes) of the BigUint64Array from the start of its {{jsxref("ArrayBuffer")}}. Fixed at construction time and thus read only.
+
{{jsxref("TypedArray.prototype.byteOffset", "BigUint64Array.prototype.byteOffset")}} {{readonlyInline}}
+
Returns the offset (in bytes) of the BigUint64Array from the start of its {{jsxref("ArrayBuffer")}}. Fixed at construction time and thus read only.
+
{{jsxref("TypedArray.prototype.length", "BigUint64Array.prototype.length")}} {{readonlyInline}}
+
Returns the number of elements hold in the BigUint64Array. Fixed at construction time and thus read only.
+
+ +

Methods

+ +
+
{{jsxref("TypedArray.copyWithin", "BigUint64Array.prototype.copyWithin()")}}
+
Copies a sequence of array elements within the array. See also {{jsxref("Array.prototype.copyWithin()")}}.
+
{{jsxref("TypedArray.entries", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.prototype.forEach()")}}
+
Calls a function for each element in the array. See also {{jsxref("Array.prototype.forEach()")}}.
+
{{jsxref("TypedArray.includes", "BigUint64Array.prototype.includes()")}}
+
Determines whether a typed array includes a certain element, returning true or false as appropriate. See also {{jsxref("Array.prototype.includes()")}}.
+
{{jsxref("TypedArray.indexOf", "BigUint64Array.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", "BigUint64Array.prototype.join()")}}
+
Joins all elements of an array into a string. See also {{jsxref("Array.prototype.join()")}}.
+
{{jsxref("TypedArray.keys", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.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.reduce", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.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", "BigUint64Array.prototype.set()")}}
+
Stores multiple values in the typed array, reading input values from a specified array.
+
{{jsxref("TypedArray.slice", "BigUint64Array.prototype.slice()")}}
+
Extracts a section of an array and returns a new array. See also {{jsxref("Array.prototype.slice()")}}.
+
{{jsxref("TypedArray.some", "BigUint64Array.prototype.some()")}}
+
Returns true if at least one element in this array satisfies the provided testing function. See also {{jsxref("Array.prototype.some()")}}.
+
{{jsxref("TypedArray.sort", "BigUint64Array.prototype.sort()")}}
+
Sorts the elements of an array in place and returns the array. See also {{jsxref("Array.prototype.sort()")}}.
+
{{jsxref("TypedArray.subarray", "BigUint64Array.prototype.subarray()")}}
+
Returns a new BigUint64Array from the given start and end element index.
+
{{jsxref("TypedArray.values", "BigUint64Array.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", "BigUint64Array.prototype.toLocaleString()")}}
+
Returns a localized string representing the array and its elements. See also {{jsxref("Array.prototype.toLocaleString()")}}.
+
{{jsxref("TypedArray.toString", "BigUint64Array.prototype.toString()")}}
+
Returns a string representing the array and its elements. See also {{jsxref("Array.prototype.toString()")}}.
+
{{jsxref("TypedArray.@@iterator", "BigUint64Array.prototype[@@iterator]()")}}
+
Returns a new Array Iterator object that contains the values for each index in the array.
+
+ +

Examples

+ +

Different ways to create a BigUint64Array:

+ +
// From a length
+var biguint64 = new BigUint64Array(2);
+biguint64[0] = 42n;
+console.log(biguint64[0]); // 42n
+console.log(biguint64.length); // 2
+console.log(biguint64.BYTES_PER_ELEMENT); // 8
+
+// From an array
+var arr = new BigUint64Array([21n,31n]);
+console.log(arr[1]); // 31n
+
+// From another TypedArray
+var x = new BigUint64Array([21n, 31n]);
+var y = new BigUint64Array(x);
+console.log(y[0]); // 21n
+
+// From an ArrayBuffer
+var buffer = new ArrayBuffer(32);
+var z = new BigUint64Array(buffer, 0, 4);
+
+// From an iterable
+var iterable = function*(){ yield* [1n, 2n, 3n]; }();
+var biguint64 = new BigUint64Array(iterable);
+// BigUint64Array[1n, 2n, 3n]
+
+ +

Specifications

+ +

BigInt proposal

+ +

Browser compatibility

+ + + +

{{Compat("javascript.builtins.BigUint64Array")}}

+ +

See also

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