JS数组a ['1']没有给出错误 [英] JS Array a['1'] doesnot gives an error

问题描述

我已经声明了一个数组 a = [1,2,3,4,5]

I have declared an array a = [1,2,3,4,5]

当我写 a [1] 时，它返回2 很好，但是当我写 a ['1'] 时，它也给我2 而不是给出错误.

When I write a[1] it returns 2 which is perfectly fine but when I write a['1'] it also gives me 2 instead of giving an error.

我在那儿期待一个错误.为什么会这样呢?

I was expecting an error there. Why does it behave like that??

推荐答案

所有属性名称都是字符串.

All property names are strings.

如果传递数字，则该数字将转换为字符串，然后再用于查找属性值.

If you pass a number, it gets converted to a string before being used to look up the property value.

console.log(1 == '1');

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