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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/BigInt/asIntN below:

BigInt.asIntN() - JavaScript | MDN

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BigInt.asIntN 静态方法将 BigInt 值转换为一个 -2^(width-1) 与 2^(width-1)-1 之间的有符号整数。

const I64_CEIL = 2n ** 63n;

console.log(BigInt.asIntN(64, I64_CEIL - 1n));
// 9223372036854775807n (2n ** 64n - 1n, the maximum non-wrapping value)
console.log(BigInt.asIntN(64, I64_CEIL));
// -9223372036854775808n (wraps to min value)
console.log(BigInt.asIntN(64, I64_CEIL + 1n));
// -9223372036854775807n (min value + 1n)
console.log(BigInt.asIntN(64, I64_CEIL * 2n));
// 0n (wrapped around to zero)
console.log(BigInt.asIntN(64, -I64_CEIL * -42n));
// 0n (also wraps on negative multiples)

BigInt.asIntN(width, bigint);

width

可存储整数的位数。

bigint

要存储在指定位数上的整数。

bigint 模 (modulo) 2^width 作为有符号整数的值。

BigInt.asIntN() 方法对于保持在 64 位 (64-bit) 算数范围内非常有用。

const max = 2n ** (64n - 1n) - 1n;

BigInt.asIntN(64, max);
// ↪ 9223372036854775807n

BigInt.asIntN(64, max + 1n);
// ↪ -9223372036854775808n
// negative because of overflow

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