YouTube API v3从播放列表中加载最后的视频

我对新的YouTube API有一个问题。与版本2通过ajax调用我可以采取最后一个视频上传到播放列表，我该如何与新的API ?谢谢您的支持。

编辑

感谢您的回答，我尝试了代码，但返回一个javascript错误:"不能读取属性'setApiKey'的未定义"下面的html代码:

<!doctype html>
<html>
  <head>
    <title>YouTube</title>
  </head>
  <body>    
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script src="https://apis.google.com/js/client.js?onload=handleClientLoad"></script>
    <script>    
        gapi.client.setApiKey('{API-KEY-HERE}');
        gapi.client.load('youtube', 'v3', function () {
            var request = gapi.client.youtube.playlistItems.list({
                part: 'snippet',
                playlistId: 'PLTK1i0pncVu_tLhgrPo_o7QcRocqozxUv'
            });
            request.execute(function (response) {
                response.items.sort(function(a,b) {return a.snippet.publishedAt < b.snippet.publishedAt})
                for (var i=0; i<response.items.length;i++)
                {
                    console.log(response.items[i].snippet.title + " published at " + response.items[i].snippet.publishedAt)
                }
            });
        });
    </script>   

  </body>
</html>

类似这样的东西将加载指定播放列表的所有视频并按publishedAt排序。对于最新的视频，只取第一个结果。

<!doctype html>
<html>
<head>
    <title>YouTube</title>
</head>
<body>
    <script>
        var allVideos = new Array();
        function onGoogleLoad() {
            gapi.client.setApiKey('{YOUR-API-KEY}');
            gapi.client.load('youtube', 'v3', function() {
                GatherVideos("", function() {
                    allVideos.sort(function(a, b) {
                        return Date.parse(b.snippet.publishedAt) - Date.parse(a.snippet.publishedAt);
                    })
                    for (var i = 0; i < allVideos.length; i++) {
                        console.log(allVideos[i].snippet.title + " published at " + allVideos[i].snippet.publishedAt)
                    }
                });
            });
        }
        function GatherVideos(pageToken, finished) {
            var request = gapi.client.youtube.playlistItems.list({
                part: 'snippet',
                playlistId: 'PLTK1i0pncVu_tLhgrPo_o7QcRocqozxUv',
                maxResults: 50,
                pageToken: pageToken
            });
            request.execute(function(response) {
                allVideos = allVideos.concat(response.items);
                if (!response.nextPageToken)
                    finished();
                else
                    GatherVideos(response.nextPageToken, finished);
            });
        }
    </script>
    <script src="https://apis.google.com/js/client.js?onload=onGoogleLoad"></script>
</body>
</html>

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