如何在JavaScript中获取数组的长度

Question

如何获取下面数组的值，我使用了.length函数但是它没有返回响应，下面是我的数组

{
"0":["Paypal Priority Placement:","39.9291958","-79.4478858","8"],
"1":["Government Hospital","69.1167545","-105.0637655","5"],
"2":["Other service","51.4611608","-2.5811462","3"],
"3":["Medanta Hospital","49.809962","-97.1344368","2"],
"4":["Amit's Clinic canada","45.487635","-73.586142","1"]
}