这是因为抽象等式比较算法要求如果 Type（x） 或 类型（y） 是一个布尔值表达式 x == y 然后应通过将布尔值强制转换为数字 ToNumber ，将 true 转换为1， false 到 +0 。

这意味着的所有比较都是真的==某事或某事== true 结果 1 ==某事或某事== 1 （替换 true 和 1 ， false 和 +0 对于 false ）。

Null类型不等于1或+ 0（事实上，null只能与AECA中的 undefined 相比）。 / p>

在 MDN 如果你想了解更多信息，那么值得一看。

_{然而，如果你强迫 null 到一个数字是强迫 +0 所以 + null == false 实际上返回 true 。}

I know that null is an object with no attributes or functions.

However, I am confused that why console.log(null == false); and console.log(null == true); both return false.

What are the conversion rules between null and boolean?

This is because the Abstract Equality Comparison Algorithm requires that if Type(x) or Type(y) is a Boolean in the expression x == y then the Boolean value should be coerced to a number via ToNumber, which converts true to 1 and false to +0.

This means that any comparison of true == something or something == true results in 1 == something or something == 1 (replacing true and 1 with false and +0 for false).

The Null type does not compare as equal to either 1 or +0 (in fact, null is only comparable to undefined in the AECA).

There is a detailed discussion of all of the different kinds of equality in JavaScript on MDN that is well worth looking at if you want to know more.

_{However, if you coerce null to a number it is coerced to +0 so +null == false actually returns true.}