本人新學javascript，遇到一個難題，嘗試了好久都沒有成功。所以上來請教下大家。
請問如何將以下結構的json轉為二維數組？

代碼：

 "piclist2": {
            "/upload/images/2018-4-17/a1.jpg": {
                "width": 1440,
                "height": 900
            },
            "/upload/images/2018-4-17/a2.jpg": {
                "width": 960,
                "height": 600
            },
            "/upload/images/2018-4-17/a3.jpg": {
                "width": 1920,
                "height": 1200
            },
            "/upload/images/2018-4-17/a4.jpg": {
                "width": 960,
                "height": 600
            }
        }

轉為

"piclist2":[
            ["upload/images/2018-4-17/a1.jpg"，
             "width": 1440,"height": 900
           ],
            ["upload/images/2018-4-17/a2.jpg"，
             "width": 1440,
             "height": 900
           ],
             ["upload/images/2018-4-17/a3.jpg"，
             "width": 1440,
             "height": 900
           ],
             ["upload/images/2018-4-17/a4.jpg"，
             "width": 1440,
             "height": 900
           ],
        ]

謝謝大家的指點！