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Update JavaScript.md #90

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2 changes: 1 addition & 1 deletion JavaScript/JavaScript.md
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Expand Up @@ -360,7 +360,7 @@ undefined 代表的含义是未定义，null 代表的含义是空对象。一
undefined 在 js 中不是一个保留字，这意味着我们可以使用 undefined 来作为一个变量名，这样的做法是非常危险的，它
会影响我们对 undefined 值的判断。但是我们可以通过一些方法获得安全的 undefined 值，比如说 void 0。

当我们对两种类型使用 typeof 进行判断的时候，Null 类型化会返回 “object”，这是一个历史遗留的问题。当我们使用双等
当我们对两种类型使用 typeof 进行判断的时候，Null 类型会返回 “object”，这是一个历史遗留的问题。当我们使用双等
号对两种类型的值进行比较时会返回 true，使用三个等号时会返回 false。
```

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