JavaScript 数组索引是字符串还是整数? [英] Is a 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 中的数组索引在内部是作为字符串处理的吗?

I had a generic question about JavaScript arrays. Are array indices in JavaScript internally handled as strings?

我在某处读到，因为数组是 JavaScript 中的对象，所以索引实际上是一个字符串.我对此有点困惑，很高兴为您提供任何解释.

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

正确的是:

> 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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