如何检查数组是否是多维的？(jQuery的)

Question

我有两个AJAX(JSON)响应数组:

一个维度:

[["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;
} 

Answer 1

您需要检查Array的第一个元素,以便使用

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

DEMO

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

Answer 2

您还可以检查数组中的所有元素，所以我认为在2019 年会更正确

const is2dArray = array =>  array.every(item => Array.isArray(item));