修正语法

src/plugins/MMCGroundStation/store.js

@@ -117,7 +117,7 @@ export default {
      * @param {} param0
      */
     end({ state, commit }) {
-      state.ws?.close();
+      state.ws && state.ws.close();
       commit("setWs", null);
       commit("setUserInfo", {});
     },