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                            ## export與export default 的區別
ES6新增的輸出模塊 二者功能相同均是輸出模塊、函數等  
一個文件或模塊中，export可以有多個，exportdefault僅有一個  
通過export方式導出，在導入時要加{ }，exportdefault則不需要

~~~
var name="李四";
export { name }

import { name } from "/.a.js" 

var name="李四";
export default name

import name from "/.a.js"  // 這里name不需要大括號
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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