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                我們可以用一對不帶任何內容的方括號來聲明一個空數組變量,例如: ``` >>> var a = []; undefined ``` 如果想定義一個帶三個元素的數組可以這么做: ``` >>> var a = [1,2,3]; undefined ``` 如何去訪問數組中的各個元素 ``` >>> var a = [1,2,3]; undefined >>> a[0]; 1 >>> a[1]; 2 ``` 元素在數組中的索引位置是從0開始編號的。因此a[0]所訪問的就是數組a的手元素,而a[1]代表第二個元素,以此類推。
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