页面事件响应问题

Do not have toHistory handler in current page: pages/PrivateTraffic/changeRoad/changeRoad. Please make sure that toHistory handler has been defined in pages/PrivateTraffic/changeRoad/changeRoad, or pages/PrivateTraffic/changeRoad/changeRoad has been added into app.json <警告提示>

事件有时无法响应。