function track(event, properties) {
  RNSensorsAnalytics && RNSensorsAnalytics.track && RNSensorsAnalytics.track(event, properties);
}
function track(event, properties) {
  RNSensorsAnalytics && RNSensorsAnalytics.track && RNSensorsAnalytics.track(event, properties);
}
function track ( event , properties ) { RNSensorsAnalytics && RNSensorsAnalytics . track && RNSensorsAnalytics . track ( event , properties ) ; }
追踪事件

@param event
@param properties
追踪事件