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                            # 1.重載
> 重載：函數根據傳入的參數不容動態決定，調用那種方法
* JS不支持重載
```
 function go(a){
    console.log(a);
}
function go(a,b){
     console.log(a,b);
}
```
* 如何讓JS支持重載
```
function go(){
   if(arguments.length==1){
       console.log(arguments[0])
   }else if(arguments.length==2){
       console.log(arguments[0]+arguments[1])
   }
}
    go(1);
    go(1,2);
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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