成员的完整列表，这些成员属于 NERtcVideoLayerSendStats,包括所有继承而来的类成员

	captureFrameRate	NERtcVideoLayerSendStats
	captureHeight	NERtcVideoLayerSendStats
	captureWidth	NERtcVideoLayerSendStats
	encoderBitrate	NERtcVideoLayerSendStats
	encoderName	NERtcVideoLayerSendStats
	encoderOutputFrameRate	NERtcVideoLayerSendStats
	height	NERtcVideoLayerSendStats
	layerType	NERtcVideoLayerSendStats
	renderFrameRate	NERtcVideoLayerSendStats
	sendBitrate	NERtcVideoLayerSendStats
	sentFrameRate	NERtcVideoLayerSendStats
	targetBitrate	NERtcVideoLayerSendStats
	width	NERtcVideoLayerSendStats