为什么新的String（'hello'）===新的String（'hello'）评估为False？ [英] Why does new String('hello') === new String('hello') evaluate to False?

问题描述

为什么下面的语句在JavaScript中返回false？

Why does the following statement return false in JavaScript?

new String('hello') === new String('hello')

推荐答案

两个字符串 objects 始终彼此不相等。请注意，JavaScript具有字符串 primitive 值以及用于创建包装器对象的String构造函数。所有对象相等性比较（特别是与 === 的比较）均作为对引用相等性的测试。当然，对两个不同对象的引用永远不会相等。

Two String objects will always be unequal to each other. Note that JavaScript has string primitive values as well as a String constructor to create wrapper objects. All object equality comparisons (especially with ===) are carried out as a test for reference equality. References to two different objects will of course never be equal to each other.

所以 hello === hello 将为 true ，因为它们是字符串基元。

So "hello" === "hello" will be true because those are string primitives.

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