Number.MIN_SAFE_INTEGER

¥Value

-9007199254740991（-9,007,199,254,740,991，或约-9 千万亿）。

¥-9007199254740991 (-9,007,199,254,740,991, or about -9 quadrillion).

¥Description

双精度浮点格式 只有 52 位来表示 mantissa，因此它只能安全地表示 -(2⁵³ – 1) 和 2⁵³ – 1 之间的整数。在这种情况下，安全是指准确表示整数并正确比较它们的能力。例如，Number.MIN_SAFE_INTEGER - 1 === Number.MIN_SAFE_INTEGER - 2 将计算为 true，这在数学上是不正确的。请参阅 Number.isSafeInteger() 了解更多信息。

¥Double precision floating point format only has 52 bits to represent the mantissa, so it can only safely represent integers between -(2⁵³ – 1) and 2⁵³ – 1. Safe in this context refers to the ability to represent integers exactly and to correctly compare them. For example, Number.MIN_SAFE_INTEGER - 1 === Number.MIN_SAFE_INTEGER - 2 will evaluate to true, which is mathematically incorrect. See Number.isSafeInteger() for more information.

由于 MIN_SAFE_INTEGER 是 Number 的静态属性，因此你始终将其用作 Number.MIN_SAFE_INTEGER，而不是作为数字值的属性。

¥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 value.

¥Examples

¥Using MIN_SAFE_INTEGER

Number.MIN_SAFE_INTEGER; // -9007199254740991
-(2 ** 53 - 1); // -9007199254740991

¥See also

• core-js 中 Number.MIN_SAFE_INTEGER 的 Polyfill
• Number.MAX_SAFE_INTEGER
• Number.isSafeInteger()
• BigInt