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                            ## 看下面代碼，給出輸出結果\[計時器\]
~~~
 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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