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                            ## 以下代碼輸出什么？
~~~
for(var i=1;i<=3;i++){
  setTimeout(function(){
      console.log(i)
  },0)
}
~~~
打印3個4，因為延時器是異步的，for循環完畢，i為4的時候，才開始執行3個延時器
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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