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                            返回一個迭代器，它能返回數組的索引值。

## 語法
~~~
arrayObj.keys();
~~~

## 參數
|參數|定義|
|--|--|
|arrayObj |必需。數組對象。|

## 備注
下面的示例演示如何獲取數組的鍵值。
~~~
var k = ["a", "b", "c"].keys();
// k.next().value == 0
// k.next().value == 1
// k.next().value == 2 
~~~

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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