Tạp Chí CNTT

<iframe width="420" height="315" src="www.youtube.com/embed/ypThsa-_wQ8" frameborder="0" allowfullscreen></iframe>

<div id=“show_thumb”>Show The thumbnail</div>

  var iframe          = $('iframe:first');
  var iframe_src   = iframe.attr('src');
  var youtube_video_id = iframe_src.match(/youtube\.com.*(\?v=|\/embed\/)(.{11})/).pop();
    if (youtube_video_id.length == 11) {
        var video_thumbnail = $('<img src="//img.youtube.com/vi/'+youtube_video_id+'/0.jpg">');
        $('body').append(video_thumbnail);
        $('img:first').click(function() {
            $('iframe:first').fadeToggle('400');
        });
    }