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
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 Full support 67 Edge No support No Firefox Full support 68 IE No support No Opera Full support 54 Safari No support No WebView Android Full support 67 Chrome Android Full support 67 Firefox Android Full support 68 Opera Android Full support 48 Safari iOS No support No Samsung Internet Android Full support 9.0 nodejs Full support 10.4.0

Legend

Full support  
Full support
No support  
No support

请参阅

  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()