javascript - Counting object pairs in JSON array

Question

ive got a problem getting parameters from a json chain, the json I got looks something like this

[{"aa":"bb","ccc":"ddd","eeee":"ffff","ggggg":"hhhhh","iiiiii":"jjjjjj","kkkkkkk":"lllllll"}]

Im trying to count how many pairs there are inside the '{}' but i dont know how. I tried json.length and json[0].length, the first one gave me back the value '1' and the second one undefined.

Answer 1

您的 json 对象是一个包含一个对象的数组。所以长度为1。数组中的对象有多个属性（键/值对）。

因此，在大多数现代浏览器（IE 除外）中，这对您有用：

Object.keys(json[0]).length

在此处查看用于在 JavaScript 中迭代/计算对象属性的各种技术的答案：

• 如何有效地计算 JavaScript 中对象的键/属性数？