如何检查数组是否是多维的？ （jQuery）

我有两个 AJAX (JSON) 响应数组：

一维：

[["fili","Chif"],["Bart","deme"],["Bomb","Jyui"],["Joiu","FDPi"],["Doen","abcd"],["drog","MAIC"],["Jasi"
,"abcd"],["Jere","Jibi"]]

三个维度：

[[["5","#"],["2","N"],["L","7"],["C","8"],["F","W"],["K","T"],["Q","E"],["Z","\/"]],[["B","O"],["$","P"
],["1","Y"],["H","R"],["3","%"],["I","U"],["M","4"],["A","9"]],[["J","X"],["Bye","G"],["D","V"],["Bye"
,"6"]]]

我尝试检查数组是否是多维的，但不起作用：

if (typeof arr[0][0] != "undefined" && arr[0][0].constructor == Array) {
     return true;
} 

您需要检查数组的第一个元素，因此使用

if(arr[0].constructor === Array)

DEMO

alert("[[]] returns " + ([[]].constructor === Array))