JavaScritp犀牛书有错误？ null === null 书上说不相等。

Question

(美)David Flanagan. JavaScript权威指南（原书第6版） (Kindle 位置 1682-1684). Kindle 版本.

严格相等运算符“===”首先计算其操作数的值，然后比较这两个值，比较过程没有任何类型转换： ·如果两个值类型不相同，则它们不相等。 ·如果两个值都是null或者都是undefined，则它们不相等。

我的理解
null === null ，应该返回 true。

在Chrome中实验
代码
console.log(" undefined === undefined, is that true? " + (undefined === undefined));
console.log(" null === null, is that true? " + (null === null));

返回结果
undefined === undefined, is that true? true
null === null, is that true? true

请问是书上写错了？

Answer 1

翻译错误。

Answer 2

我觉得是不是你的书的问题……
我给你摘抄一段：

The strict equality operator === evaluates its operands, and then compares the two
values as follows, performing no type conversion:

• If the two values have different types, they are not equal.

• If both values are null or both values are undefined, they are equal.

• If both values are the boolean value true or both are the boolean value false, they are equal.

...

第二条是说的相等的

Answer 3

https://www.zhihu.com/questio...
你可以看一下这个

Answer 4

..你返回的不就是true么