javascript - 在显示 twitter feed 时，如何使用 JavaScript 或 JQuery 检查特定推文是否被转发？

Question

Possible Duplicate:
Telling Whether A Tweet Is A Retweet Or Not?

所以我一直在研究一个提取我的提要的 Twitter 提要脚本。我想知道如何检查特定推文是否被转发，然后如果被转发，我想使用转发的推文中的信息。下面是 twitter API 为转发生成的关联数组示例。

Array
(
    [0] => Array
        (
            [created_at] => Sun Jan 06 08:28:39 +0000 2013
            [id] => 287838076443705345
            [id_str] => 287838076443705345
            [text] => RT @Fullscreen: Heads-up: many YT partners are reporting issues claiming their videos. It appears to be a YT bug. We will keep you posted.
            [source] => web
            ... 
            [user] => Array
                (
                    [id] => 212642904
                    [id_str] => 212642904
                    [name] => Elias Ranz-Schleifer
                    [screen_name] => Xxplosions
                    ... 
                )
                ...
            [retweeted_status] => Array
                (
                    [created_at] => Sun Jan 06 02:08:43 +0000 2013
                    [id] => 287742460824805378
                    [id_str] => 287742460824805378
                    [text] => Heads-up: many YT partners are reporting issues claiming their videos. It appears to be a YT bug. We will keep you posted.
                    ... 
                    [user] => Array
                        (
                            [id] => 238110322
                            [id_str] => 238110322
                            [name] => Fullscreen, Inc.
                            [screen_name] => Fullscreen
                            ... 
                        )
                        ...
                )

            [retweet_count] => 44
            ...
        )

)

所以本质上我想替换 [text] => RT @Fullscreen: Heads-up: many...与 [text] => Heads-up: many...仅当它存在时。如果不存在，则使用从推文中提取信息的常规方法。我想基本上我想要了解的是如何检查 [retweeted_status] 是否存在则提取该信息，如果不存在则提取其他信息。我想避免 RT 在那里，因为它看起来确实是可能的，并使用像 id_str, text, screen_name, etc. 这样的信息。

我用来获取常规推文拉取信息的代码是:

id = tweets[i]["id_str"];
twitPic = tweets[0]["user"]["profile_image_url_https"];
content = tweets[i]["text"];
tweetTime = tweets[i]["created_at"];

哪里i被 for 循环中的索引替换。如果您对我想要了解的内容有任何疑问，请告诉我，我很乐意为您解答。

Answer 1

您可以像这样测试 key 是否存在:

// by using the 'in' operator
content = ('retweeted_status' in tweets[i]) ?  tweets[i]["retweeted_status"] : tweets[i]["text"];
// or by using the method 'hasOwnProperty()'
if(tweets[i].hasOwnProperty('retweeted_status')) {
    content = tweets[i]["retweeted_status"];
} else {
    content = tweets[i]["text"];
}

您还可以检查未定义，但这不是测试键是否存在的准确方法(如果键存在但值实际上未定义怎么办？)。