BigInt64Array

BigInt64Array 类型数组表示按平台字节顺序排列的 64 位有符号整数数组。如果需要控制字节顺序，请使用 DataView。除非明确提供初始化数据，否则内容将初始化为 0n。一旦建立，你可以使用对象的方法或使用标准数组索引语法（即使用括号表示法）来引用数组中的元素。

¥The BigInt64Array typed array represents an array of 64-bit signed integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0n unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

BigInt64Array 是隐藏 TypedArray 类的子类。

¥BigInt64Array is a subclass of the hidden TypedArray class.

Try it

构造函数

¥Constructor

BigInt64Array()

创建一个新的 BigInt64Array 对象。

静态属性

¥Static properties

还从其父级 TypedArray 继承静态属性。

¥Also inherits static properties from its parent TypedArray.

BigInt64Array.BYTES_PER_ELEMENT

返回元素大小的数值。8 在 BigInt64Array 的情况下。

静态方法

¥Static methods

从其父级 TypedArray 继承静态方法。

¥Inherits static methods from its parent TypedArray.

实例属性

¥Instance properties

还从其父级 TypedArray 继承实例属性。

¥Also inherits instance properties from its parent TypedArray.

这些属性在 BigInt64Array.prototype 上定义并由所有 BigInt64Array 实例共享。

¥These properties are defined on BigInt64Array.prototype and shared by all BigInt64Array instances.

BigInt64Array.prototype.BYTES_PER_ELEMENT

返回元素大小的数值。如果是 BigInt64Array，则为 8。

BigInt64Array.prototype.constructor

创建实例对象的构造函数。对于 BigInt64Array 实例，初始值为 BigInt64Array 构造函数。

实例方法

¥Instance methods

从其父级 TypedArray 继承实例方法。

¥Inherits instance methods from its parent TypedArray.

示例

¥Examples

创建 BigInt64Array 的不同方法

¥Different ways to create a BigInt64Array

js
// From a length
const bigint64 = new BigInt64Array(2);
bigint64[0] = 42n;
console.log(bigint64[0]); // 42n
console.log(bigint64.length); // 2
console.log(bigint64.BYTES_PER_ELEMENT); // 8

// From an array
const x = new BigInt64Array([21n, 31n]);
console.log(x[1]); // 31n

// From another TypedArray
const y = new BigInt64Array(x);
console.log(y[0]); // 21n

// From an ArrayBuffer
const buffer = new ArrayBuffer(64);
const z = new BigInt64Array(buffer, 8, 4);
console.log(z.byteOffset); // 8

// From an iterable
const iterable = (function* () {
  yield* [1n, 2n, 3n];
})();
const bigint64FromIterable = new BigInt64Array(iterable);
console.log(bigint64FromIterable);
// BigInt64Array [1n, 2n, 3n]

规范

Specification
ECMAScript Language Specification
# sec-typedarray-objects

¥Specifications

浏览器兼容性

BCD tables only load in the browser

¥Browser compatibility

也可以看看

¥See also