Number.MIN_SAFE_INTEGER - JavaScript 编辑

The Number.MIN_SAFE_INTEGER constant represents the minimum safe integer in JavaScript (-(253 - 1)).

To represent integers smaller than this, consider using BigInt.

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.

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.

Property attributes of Number.MIN_SAFE_INTEGER
Writable	no
Enumerable	no
Configurable	no

Description

The MIN_SAFE_INTEGER constant has a value of -9007199254740991 (-9,007,199,254,740,991 or about -9 quadrillion). The reasoning behind that number is that JavaScript uses double-precision floating-point format numbers as specified in IEEE 754 and can only safely represent numbers between -(253 - 1) and 253 - 1.  See Number.isSafeInteger() for more information.

Because MIN_SAFE_INTEGER is a static property of Number, you always use it as Number.MIN_SAFE_INTEGER, rather than as a property of a Number object you created.

Examples

Using MIN_SAFE_INTEGER

Number.MIN_SAFE_INTEGER // -9007199254740991
-(Math.pow(2, 53) - 1)  // -9007199254740991

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Number.MIN_SAFE_INTEGER' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• Number.MAX_SAFE_INTEGER
• Number.isSafeInteger()
• BigInt