text:     //get can play file type
      $.extend(Video.prototype, {
          videoType: ['video/mp4; codecs="avc1.42E01E"', 'video/ogg; codecs="theora"', 'video/webm; codecs="vp8, vorbis"'],
          getCanPlayType: function() {
              var myvideo = document.createElement('video');
              var playMsg, videotype;
              var canplayTypes = [];
              if (myvideo.canPlayType) {
                  videotype = this.videoType[0];
                  playMsg = myvideo.canPlayType(videotype);
                  if ('' != playMsg) {
                      // return this._slideType(videotype)
                      canplayTypes.push(this._slideType(videotype));
                  }
  
                  videotype = this.videoType[1];
                  playMsg = myvideo.canPlayType(videotype);
                  if ('' != playMsg) {
                      // return this._slideType(videotype)
                      canplayTypes.push(this._slideType(videotype));
                  }
  
                  videotype = this.videoType[2];
                  playMsg = myvideo.canPlayType(videotype);
                  if ('' != playMsg) {
                      // return this._slideType(videotype)
                      canplayTypes.push(this._slideType(videotype));
                  }
  
                  playMsg = myvideo.canPlayType('application/vnd.apple.mpegurl');
                  if ('' != playMsg) {
                      // return this._slideType(videotype)
                      canplayTypes.push('m3u8');
                  }
  
                  if (canplayTypes.length > 0) {
                      return canplayTypes;
                  }
                  return false;
  
  
              } else {
                  return false;
              }
          },
          _slideType: function(str) {
              return /\/(.*);/i.exec(str)[1]
          }
      });