如下面的代码：Left 和Top 用来设定播放窗口的位置这个明白，但是iframex和iframey是用来做什么的？
自动识别当前浏览器指定位置和大小启动：
{"req":"Wrl_VLCWebPlayer","rid":5,"para":{"Type":"0","Title":"VLC Web Player","Flag":66,"Left":20,"Top":230,"Width":480,"Height":320,"IframeX":0,"IframeY":0,"BarW":0,"BarH":0,"ScrollTop":0,"Version":"0","ShowType":4,"Open":"https://vjs.zencdn.net/v/oceans.mp4","Web":[{"ID":2,"Uri":"rtsp://wzh:test123456@192.168.1.8:554/h264/ch1/main/av_stream","Option":":rtsp-tcp"},{"ID":3,"Uri":"http://www.yuanmaster.com/Files/RTSP.mp4","Option":":file-caching=300"},{"ID":4,"Uri":"rtsp://wzh:test123456@192.168.1.8:554/h264/ch1/sub/av_stream","Option":":network-caching=200"}]}}
