如何在JavaScript中区分数组和json对象

Question

“我想区分json对象和javascript中的数组。”
    ****************************************************** ************************       例如：data = {“ 1”：2，                                         “ 2”：[1,32,4]，                                         “ 3”：{“ x”：“ y”}，                                         “ 4”：[{“ q”：“ w”}，{“ a”：“ s”}，{“ z”：“ x”}]，                                         “ 5”：true}

    data['2'] and data['3'] both are object,

    typeof(data['2']) -- object
    typeof(data['3']) -- object

    Even if i try to iterate over items to check which has key value using for loop.
    for item in data['2']-- return index 012(as string)
    for item in data['3']-- return keys(as string)