JavaScript Ajax 数据是数组，但长度未定义

Question

我有以下 Json 结果:

(取自控制台)

data
Object {0: Object, 1: Object, 2: Object, 3: Object, 4: Object, 5: Object, 7: Object}

如果我在控制台中执行data[0]，我会得到以下结果:

Object {id: 125, Module_id: 2, academy_id: 7, Team_id: 5, end: "2014-08-12 00:00:00"…}

但是，当我执行data.length时，该值是未定义，任何人都可以告诉我发生了什么事吗？

Answer 1

使用Object.keys

Object.keys(data).length;

DEMO

The Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).