为什么我的JSON对象未定义? [英] Why is my JSON object undefined?

问题描述

我正在尝试解析JSON数据结构，但我认为应该返回的数据未定义.

I'm trying to parse a JSON data structure but what I think should be data is returning undefined.

这是我正在使用的jQuery:

Here is the jQuery I'm using:

....
var messages = data.messages;

$.each(messages, function(i, val) {

    var user = messages[i];

    //console.log(user);
    console.log(user['msg']);

});

PHP数据结构如下:

The PHP data structure look like this:

...
$message_info = array();

$message_info[$row['username']]['prvt'] = 1;
$message_info[$row['username']]['msg'] = stripslashes($row['message']);
$message_info[$row['username']]['ts'] = $row['timestamp'];

...

$message_list[] = $message_info;

...

$res->messages = $message_list;
echo json_encode($res);

如果我将用户转储到控制台，则输出如下所示:Object

If I dump user to the console the output look like this:Object

{john: Object}
  john: Object
  msg: "test msg"
  prvt: 0
  ts: "2012-12-10 09:16:13"

这是控制台中的数据:

Object {success: true, lastid: "60", messages: Array[15]}
lastid: "60"
messages: Array[15]
  0: Object
    john: Object
      msg: "test msg"
      prvt: 0
      ts: "2012-12-10 09:16:13"
  1: Object
    john2: Object
      msg: "test msg2"
      prvt: 1
      ts: "2012-12-10 09:18:13"
 ...

有人知道为什么我无法访问和检索味精的内容吗?

Any idea why I can't access and retrieve the contents of msg?

推荐答案

重写PHP，以避免在$row['username']内嵌套msg:

Rewrite your PHP to avoid nesting msg inside of $row['username']:

$message_info = array();
$message_info['username'] = $row['username']; // find this in JS with user['username']
$message_info['prvt'] = 1;
$message_info['msg'] = stripslashes($row['message']);
$message_info['ts'] = $row['timestamp'];

进行此更改后，您的JavaScript应该可以按原样工作.

With that change, your JavaScript should work as-is.

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