javascript - 如何读取json

Question

我有以下 JSON 对象。

{"feed":[
    {"news":
      {"adopted_from":null,"user_id":null,"description":"this is test","id":2}
   },
   {"news":
     {"adopted_from":null,"user_id":null,"description":"like unlike done","id":1}
    }
]}

我想检索新闻的ID。我尝试了许多不同的方式（例如feed[0].news.id, feed.news.id, feed[[0].news.id]）但无法访问该值。谁能帮助我如何使用 JavaScript 访问它？

Answer 1

我从上面复制并粘贴了您的 JSON 并尝试了以下操作，效果很好：

    var data = {"feed":[{"news":{"adopted_from":null,"user_id":null,"description":"this is test","id":2}},{"news":{"adopted_from":null,"user_id":null,"description":"like unlike done","id":1}}]};
    // alert the first news id
    alert(data.feed[0].news.id);

news它按预期从数组中的第一个对象获取 id 。

Answer 2

这对我有用：

var f = {"feed":[{"news":{"adopted_from":null,"user_id":null,"description":"this is test","id":2}},{"news":{"adopted_from":null,"user_id":null,"description":"like unlike done","id":1}}]}
alert( f.feed[0].news.id )

Answer 3

var feed = json_decode(yourData)
for(var counter in feed) {
    console.log(feed[counter].news.id);
}