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                            js中，不能為變量定義特定的塊作用域，但可定義其所屬的函數域。亦。若某變量在某個函數中定義，則函數外不可見，if和for這樣的代碼塊中定義除外。
局部變量：某個函數中定義的變量，函數內的代碼可以像訪問自己的局部變量那樣訪問全局變量，反之不可。

**函數作用域始終優先于全局作用域**
![](https://box.kancloud.cn/6fb9982ae78b0d56af292eb395b6d26e_131x102.png)

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