var a = [ 1, 2 ], b = [ 1, 2 ], c = [ 1, 3 ];
    alert(a == b);//false
    alert(a == c);//false,切记不能直接比较!!

    //法一:
    alert(a.toString() == b.toString());//true
    alert(a.toString() == c.toString());//false

    //法二:运用for循环逐个比较
   .............................




 

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