BigUint64Array

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 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

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 BigUint64Array.prototype.length.
BigUint64Array.prototype (en-US): Prototype for the TypedArray objects.

Methods

BigUint64Array.from(): Creates a new BigUint64Array from an array-like or iterable object. See also Array.from().
BigUint64Array.of(): Creates a new BigUint64Array with a variable number of arguments. See also Array.of().

`BigUint64Array` prototype

All BigUint64Array objects inherit from %TypedArray%.prototype (en-US).

Properties

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

Methods

BigUint64Array.prototype.copyWithin(): Copies a sequence of array elements within the array. See also Array.prototype.copyWithin().
BigUint64Array.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().
BigUint64Array.prototype.every(): Tests whether all elements in the array pass the test provided by a function. See also Array.prototype.every().
BigUint64Array.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().
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 Array.prototype.filter().
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 Array.prototype.find().
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 Array.prototype.findIndex().
BigUint64Array.prototype.forEach(): Calls a function for each element in the array. See also Array.prototype.forEach().
BigUint64Array.prototype.includes(): Determines whether a typed array includes a certain element, returning true or false as appropriate. See also Array.prototype.includes().
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 Array.prototype.indexOf().
BigUint64Array.prototype.join(): Joins all elements of an array into a string. See also Array.prototype.join().
BigUint64Array.prototype.keys(): Returns a new Array Iterator that contains the keys for each index in the array. See also Array.prototype.keys().
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 Array.prototype.lastIndexOf().
BigUint64Array.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().
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 Array.prototype.reduce().
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 Array.prototype.reduceRight().
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 Array.prototype.reverse().
BigUint64Array.prototype.set(): Stores multiple values in the typed array, reading input values from a specified array.
BigUint64Array.prototype.slice(): Extracts a section of an array and returns a new array. See also Array.prototype.slice().
BigUint64Array.prototype.some(): Returns true if at least one element in this array satisfies the provided testing function. See also Array.prototype.some().
BigUint64Array.prototype.sort(): Sorts the elements of an array in place and returns the array. See also Array.prototype.sort().
BigUint64Array.prototype.subarray(): Returns a new BigUint64Array from the given start and end element index.
BigUint64Array.prototype.values(): Returns a new Array Iterator object that contains the values for each index in the array. See also Array.prototype.values().
BigUint64Array.prototype.toLocaleString(): Returns a localized string representing the array and its elements. See also Array.prototype.toLocaleString().
BigUint64Array.prototype.toString(): Returns a string representing the array and its elements. See also Array.prototype.toString().
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

BCD tables only load in the browser