二维数组 ：数组里面套数组

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    6.     <title>Document</title>
    7. </head>
    8. <body>
    9.     <script>
    10.         // 二维数组  数组里面套数组
    11.         var arr = [[1,2],[3,4]];
    12.         console.log(arr[0][1])
    13.         console.log(arr[1][0])
    14.     </script>
    15. </body>
    16. </html>

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