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                export 一個單值類型,其他地方將其import,無法進行修改 ``` export const a = 1 import { a } from 'xxx' a = 2; //報錯 ``` 如果是export一個引用類型,那么不可修改其地址,但可以修改值 ``` export const obj = { name: 'a' } import { obj } from 'xxx' obj = {} //報錯 obj.name = 'b' //不報錯,并且任何導入obj的地方的name都會變成b,也就是說具有全局性 ```
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