BigUint64Array - JavaScript 编辑
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.
8in the case of aBigUint64Array. - BigUint64Array.length
- Static length property whose value is 3. For the actual length (number of elements), see
BigUint64Array.prototype.length. BigUint64Array.name- Returns the string value of the constructor name. In the case of the
BigUint64Arraytype: "BigUint64Array". BigUint64Array.prototype- Prototype for the TypedArray objects.
Methods
BigUint64Array.from()- Creates a new
BigUint64Arrayfrom an array-like or iterable object. See alsoArray.from(). BigUint64Array.of()- Creates a new
BigUint64Arraywith a variable number of arguments. See alsoArray.of().
BigUint64Array prototype
All BigUint64Array objects inherit from %TypedArray%.prototype.
Properties
BigUint64Array.prototype.constructor- Returns the function that created an instance's prototype. This is the
BigUint64Arrayconstructor by default. BigUint64Array.prototype.buffer只读- Returns the
ArrayBufferreferenced by theBigUint64Array. Fixed at construction time and thus read only. BigUint64Array.prototype.byteLength只读- Returns the length (in bytes) of the
BigUint64Arrayfrom the start of itsArrayBuffer. Fixed at construction time and thus read only. BigUint64Array.prototype.byteOffset只读- Returns the offset (in bytes) of the
BigUint64Arrayfrom the start of itsArrayBuffer. 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 Iteratorobject that contains the key/value pairs for each index in the array. See alsoArray.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
undefinedif not found. See alsoArray.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
trueorfalseas appropriate. See alsoArray.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 Iteratorthat contains the keys for each index in the array. See alsoArray.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
BigUint64Arrayfrom the given start and end element index. BigUint64Array.prototype.values()- Returns a new
Array Iteratorobject that contains the values for each index in the array. See alsoArray.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 Iteratorobject 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
Browser compatibility
BCD tables only load in the browser
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.See also
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