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                            以下代碼輸出什么
```js
var bar = true;
console.log(bar + 0);   
console.log(bar + "xyz");  
console.log(bar + true);  
console.log(bar + false);
```
打印結果
> 1  
truexyz  
2  
1


## 下面給出一個加法操作表
Number + Number -> 加法  
Boolean + Number -> 加法  
Boolean + Boolean -> 加法  
Number + String -> 連接  
String + Boolean -> 連接  
String + String -> 連接

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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