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                            一般獲取對象的key值有兩種方法：

##### for...in...

for...in...是遍歷對象的所有key值。


```js
function a(){
  const b={"x":"c","y":"d"};
  for(let key in b){
    console.log(key);
  }
}
a();
```

輸出結果為：`"x" "y"`

##### Object.keys()

Object.keys() 方法會返回一個key值的數組。


```js
function a(){
  const b={"x":"c","y":"d"};
  console.log(Object.keys(b));
}
a();
```

輸出結果為：`["x", "y"]`
  

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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