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                ### ES6模塊:export & import 1. ES6模塊在編譯時就已經確定,可做靜態優化,ES6模塊不是對象 2. CommonJS、AMD模塊都是在運行時確定,無法在編譯階段做靜態優化 3. ES6模塊自動采用嚴格模式,無需聲明' use strict ' 4. export && import 使用時應在模塊的作用域頂層,比如出現在塊級作用域內,會報錯,原因是在編譯階段不會去分析語句,所以import無法在語句中引入 5. export 導出模塊內的變量:可以是變量、函數、類 export var a = 1 || export { a } || export { a as b } 導出時提供別名 6. import { a } from './test.js':如果a模塊是個對象,修改a的屬性,模塊內的值會發生變更 7. import * as all from './test.js':整體加載模塊內導出的所有內容,綁定到all對象身上 8. import 模塊導入會提升到當前模塊的最頂層 9. export default 45 || {} || fn:輸出默認變量 10. import _, { a, b } from './text.js':導入默認變量與固定接口 11. export { a, b } from './test.js':導入模塊輸出模塊一體化書寫 ### ES6動態引入模塊 1. import( './test.js' ):動態引入模塊,可實現require( './test' )的功能
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