如何访问JSON对象数组的第一个元素？ [英] How to access first element of JSON object array?

问题描述

我认为mandrill_events只包含一个对象。如何访问 event-property ？

I exptect that mandrill_events only contains one object. How do I access its event-property?

var req = { mandrill_events: '[{"event":"inbound","ts":1426249238}]' }

推荐答案

要回答你的名义问题，你可以使用 [0] 来访问第一个元素，但是因为它是 mandrill_events 包含一个不是数组的字符串，所以 mandrill_events [0] 只会得到第一个字符'['。

To answer your titular question, you use [0] to access the first element, but as it stands mandrill_events contains a string not an array, so mandrill_events[0] will just get you the first character, '['.

因此，要么将您的来源更正为：

So either correct your source to:

var req = { mandrill_events: [{"event":"inbound","ts":1426249238}] };

然后 req.mandrill_events [0] ，或者如果你坚持使用它是一个字符串，解析字符串包含的JSON：

and then req.mandrill_events[0], or if you're stuck with it being a string, parse the JSON the string contains:

var req = { mandrill_events: '[{"event":"inbound","ts":1426249238}]' };
var mandrill_events = JSON.parse(req.mandrill_events);
var result = mandrill_events[0];

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