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                ## 文件作用域 在 JavaScript 文件中聲明的變量和函數只在該文件中有效;不同的文件中可以聲明相同名字的變量和函數,不會互相影響。 通過全局函數 [`getApp()`](https://mp.weixin.qq.com/debug/wxadoc/dev/framework/app-service/app.html#getapp) 可以獲取全局的應用實例,如果需要全局的數據可以在 `App()` 中設置,如: ```js // app.js App({ globalData: 1 }) ``` ```js // a.js // The localValue can only be used in file a.js. var localValue = 'a' // Get the app instance. var app = getApp() // Get the global data and change it. app.globalData++ ``` ```js // b.js // You can redefine localValue in file b.js, without interference with the localValue in a.js. var localValue = 'b' // If a.js it run before b.js, now the globalData shoule be 2. console.log(getApp().globalData) ```
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