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.8in the case of aBigUint64Array.BigUint64Array.lengthStatic length property whose value is 3. For the actual length(number of elements), seeBigUint64Array.prototype.length.BigUint64Array.nameReturns the string value of the constructor name. In the case of theBigUint64Arraytype:"BigUint64Array".BigUint64Array.prototypePrototype for theTypedArrayobjects.

Methods

BigUint64Array.from()Creates a newBigUint64Arrayfrom an array-like or iterable object. See alsoArray.from().BigUint64Array.of()Creates a newBigUint64Arraywith a variable number of arguments. See alsoArray.of().

BigUint64Arrayprototype

AllBigUint64Arrayobjects inherit from%TypedArray%.prototype.

Properties

BigUint64Array.prototype.constructorReturns the function that created an instance's prototype. This is theBigUint64Arrayconstructor by default.BigUint64Array.prototype.buffer只读Returns theArrayBufferreferenced by theBigUint64Array. Fixed at construction time and thusread only.BigUint64Array.prototype.byteLength只读Returns the length(in bytes)of theBigUint64Arrayfrom the start of itsArrayBuffer. Fixed at construction time and thusread only.BigUint64Array.prototype.byteOffset只读Returns the offset(in bytes)of theBigUint64Arrayfrom the start of itsArrayBuffer. Fixed at construction time and thusread only.BigUint64Array.prototype.length只读Returns the number of elements hold in theBigUint64Array. Fixed at construction time and thusread only.

Methods

BigUint64Array.prototype.copyWithin()Copies a sequence of array elements within the array. See alsoArray.prototype.copyWithin().BigUint64Array.prototype.entries()Returns a newArray 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 alsoArray.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 alsoArray.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 alsoArray.prototype.filter().BigUint64Array.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().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 alsoArray.prototype.findIndex().BigUint64Array.prototype.forEach()Calls a function for each element in the array. See alsoArray.prototype.forEach().BigUint64Array.prototype.includes()Determines whether a typed array includes a certain element, returningtrueorfalseas 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 alsoArray.prototype.indexOf().BigUint64Array.prototype.join()Joins all elements of an array into a string. See alsoArray.prototype.join().BigUint64Array.prototype.keys()Returns a newArray 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 alsoArray.prototype.lastIndexOf().BigUint64Array.prototype.map()Creates a new array with the results of calling a provided function on every element in this array. See alsoArray.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 alsoArray.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 alsoArray.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 alsoArray.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 alsoArray.prototype.slice().BigUint64Array.prototype.some()Returns true if at least one element in this array satisfies the provided testing function. See alsoArray.prototype.some().BigUint64Array.prototype.sort()Sorts the elements of an array in place and returns the array. See alsoArray.prototype.sort().BigUint64Array.prototype.subarray()Returns a newBigUint64Arrayfrom the given start and end element index.BigUint64Array.prototype.values()Returns a newArray 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 alsoArray.prototype.toLocaleString().BigUint64Array.prototype.toString()Returns a string representing the array and its elements. See alsoArray.prototype.toString().BigUint64Array.prototype[@@iterator]()Returns a newArray Iteratorobject that contains the values for each index in the array.

Examples

Different ways to create aBigUint64Array:

// 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]

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