BigInt64Array() 构造函数
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2021年9月.
BigInt64Array() 构造函数用于创建 BigInt64Array 对象。除非显式提供初始化数据，否则其内容会被初始化为 0n。
语法
js
new BigInt64Array()
new BigInt64Array(length)
new BigInt64Array(typedArray)
new BigInt64Array(object)
new BigInt64Array(buffer)
new BigInt64Array(buffer, byteOffset)
new BigInt64Array(buffer, byteOffset, length)
参数
参见 TypedArray。
异常
参见 TypedArray。
示例
创建 BigInt64Array 的不同方式
js
// 通过长度创建
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
// 通过数组创建
const x = new BigInt64Array([21n, 31n]);
console.log(x[1]); // 31n
// 通过另一个 TypedArray 创建
const y = new BigInt64Array(x);
console.log(y[0]); // 21n
// 通过 ArrayBuffer 创建
const buffer = new ArrayBuffer(64);
const z = new BigInt64Array(buffer, 8, 4);
console.log(z.byteOffset); // 8
// 通过可迭代对象创建
const iterable = (function* () {
yield* [1n, 2n, 3n];
})();
const bigint64FromIterable = new BigInt64Array(iterable);
console.log(bigint64FromIterable);
// BigInt64Array [1n, 2n, 3n]
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-typedarray-constructors |
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