已存在的流列表，点击自动播放:

1. 初始演示
2. 每秒自动刷新

url:

simulcast:

useCamera:

audioEnable:

videoEnable:

method(play or push or echo): echo push play

resolution:

datachannel:

开始(start) 停止(stop)

msgsend:

msgrecv:

发送(send by datachannel) 关闭(close datachannel)

videodevice:

audiodevice:

switchDevice:

切换视频(switch video) 切换音频(switch audio)