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为什么​Javascript不能直接用==或者===来判断两个数组活着对象是否相等?

为什么​Javascript不能直接用==或者===来判断两个数组活着对象是否相等?

retisan 2017-09-21 14:46:31
<script type="text/javascript">        alert([]==[]); // false        alert([]===[]); // false</script>
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4 回答

?
__innocence

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对象A == 对象B 为true的充要条件是 : A、B为同一个对象

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3 反对 回复 2017-09-21
?
杜发明

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  1. 你这个问题其实和 == and === 其实关系不大,后面这个是忽略了类型的判断;

  2. 判断相等一般情况下都是类型和值都要一样,虽然这块是两个看似一样的空数组,但是这已经是两个不同的对象了。通常情况用键值,字符串进行判断。

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1 反对 回复 2017-09-21
?
慕妹4267064

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反对 回复 2021-09-27
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Willsf

TA贡献3条经验 获得超0个赞

数组,函数,对象都是引用类型,引用类型按引用访问的,换句话说就是比较两个对象的堆内存中的地址是否相同,两个数组堆内存中地址是不同的,要相等得这样var a=[],var b=a;a===b true 

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反对 回复 2017-09-22
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橋本奈奈未

TA贡献436条经验 获得超108个赞

因为对应不同的值,每个数组和对象对应不同的内存空间。比较数组和对象是比较引用(或者叫指针)是否相同

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反对 回复 2017-09-21
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