JavaScript数组索引是字符串还是整数？ [英] Is JavaScript array index a string or an integer?

问题描述

我有一个关于JavaScript数组的一般性问题。 JavaScript中的数组索引是否作为字符串内部处理？我读到某处，因为数组是JavaScript中的对象，索引实际上是一个字符串。我对此感到有点困惑，并且对任何解释都很高兴。

I had a generic question about JavaScript arrays. Are array indices in JavaScript internally handled as strings? I read somewhere that because arrays are objects in JavaScript, the index is actually a string. I am a bit confused about this, and would be glad for any explanation.

推荐答案

这是正确的：

> var a = ['a','b','c']
undefined
> a
[ 'a', 'b', 'c' ]
> a[0]
'a'
> a['0']
'a'
> a['4'] = 'e'
'e'
> a[3] = 'd'
'd'
> a
[ 'a', 'b', 'c', 'd', 'e' ]

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