var citys = ["云南","四川","贵州"]

var dict = [

    "云南":["昆明","昭通","大理","楚雄"],

    "四川":["成都","资中","宜宾","资阳"],

    "贵州":["贵阳","六盘水","水城"]]

请问老师，我现在想根据citys中的内容来取得dict中对应的数组，应该怎样操作呢？