本文解释了在JavaScript中所有对象的属性名都是字符串形式这一概念，并通过实例说明当使用非字符串值作为属性名时，这些值如何被转换为字符串。
The reason for this is that in JavaScript, all object property names are strings, and any non-string value placed inside a square bracket property accessor is converted into a string. In the example above, key1 and
key2 are both converted to "[object Object]".
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