BigInt.asIntN()

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

语法

BigInt.asIntN(width, bigint);

参数

width
可存储整数的位数。
bigint
要存储在指定位数上的整数。

返回值

bigint 模(modulo) 2width 作为有符号整数的值。

例子

保持在64位范围内

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

标准

Specification Status
ECMAScript Latest Draft (ECMA-262)
BigInt.asIntN()		 Draft

浏览器支持

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
asIntNChrome Full support 67Edge No support NoFirefox Full support 68IE No support NoOpera Full support 54Safari No support NoWebView Android Full support 67Chrome Android Full support 67Firefox Android Full support 68Opera Android Full support 48Safari iOS No support NoSamsung Internet Android Full support 9.0nodejs Full support 10.4.0

Legend

Full support  
Full support
No support  
No support

请参阅

相关主题
  1. JavaScript 标准库
  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. 属性
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.name
    7. Function.prototype
  7. 方法
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()
  8. Object
  9. 属性
    1. Object.prototype.__count__
    2. Object.prototype.__noSuchMethod__
    3. Object.prototype.__parent__
    4. Object.prototype.__proto__
    5. 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.unwatch()
    12. Object.prototype.valueOf()
    13. Object.prototype.watch()
    14. Object.setPrototypeOf()