如何从任何类型的提要中提取标题、图像和文本?

谷歌订阅源API: http://code.google.com/apis/ajaxfeeds/

google.load("feeds", "1");


    function initialize() {
      var feed = new google.feeds.Feed("http://feeds.mashable.com/Mashable?format=xml");
      feed.load(function(result) {
        if (!result.error) {
          var container = document.getElementById("feed");
          for (var i = 0; i < result.feed.entries.length; i++) {
            var entry = result.feed.entries[i];
            var div = document.createElement("div");
            div.appendChild(document.createTextNode(entry.title));
            container.appendChild(div);
          }
        }
      });
    }
    google.setOnLoadCallback(initialize);