live-pusher属性值的改变 例如:组件推流过程中,切换前后摄像头时,要改变mirror的值并使其生效; LivePusherContext = wx.createLivePusherContext() 1. LivePusherContext.switchCamera() 2. LivePusherContext.stop() 3.this.mirror = !this.mirror 4.LivePusherContext.start()