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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

BigInt.asIntN static method is used to wrap a BigInt value to a signed integer between -2 ^width-1 and 2 ^width-1 -1.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

句法

BigInt.asIntN(width, bigint);
					

参数

width

The amount of bits available for the integer size.

bigint

The integer to clamp to fit into the supplied bits.

返回

值 bigint modulo 2 width as a signed integer.

范例

Staying in 64-bit ranges

BigInt.asIntN() method can be useful to stay in the range of 64-bit arithmetic.

const max = 2n ** (64n - 1n) - 1n;
BigInt.asIntN(64, max);
// ↪ 9223372036854775807n
BigInt.asIntN(64, max + 1n);
// ↪ -9223372036854775807n
// negative because of overflow
					

规范

规范
ECMAScript (ECMA-262) The definition of 'BigInt.asIntN()' in that specification.

浏览器兼容性

The compatibility table in 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. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
asIntN	Chrome 67	Edge 79	Firefox 68	IE No	Opera 54	Safari No	WebView Android 67	Chrome Android 67	Firefox Android 68	Opera Android 48	Safari iOS No	Samsung Internet Android 9.0	nodejs 10.4.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• BigInt
• BigInt.asUintN()

元数据

• 最后修改： Mar 20, 2020

相关话题

1. 标准内置对象
2. BigInt
3. 方法
   1. BigInt.asIntN()
   2. BigInt.asUintN()
   3. BigInt.prototype.toLocaleString()
   4. BigInt.prototype.toString()
   5. BigInt.prototype.valueOf()
4. 继承：
5. Function
6. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
7. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
8. Object
9. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
10. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()