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                            ```js
 for(var i = 1; i <= 3; i++){  
  setTimeout(function(){
      console.log(i);   
  },0); 
};
```

答案：4 4 4。
原因：Javascript事件處理器在線程空閑之前不會運行。
注：使用let 可正常輸出i的值

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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