fix: 改到EVENT_BEFORE_POPUPVIEW事件中去做

src/modules/pages/connection/list/list_item/list_item.ts

@@ -104,6 +104,10 @@ export class ListItem extends BI.BasicButton {
                             eventName: BI.DownListCombo.EVENT_CHANGE,
                             action: (value: string) => {
                                 this.itemActionCalculate().actionClac(value);
+                            },
+                        }, {
+                            eventName: BI.DownListCombo.EVENT_BEFORE_POPUPVIEW,
+                            action: () => {
                                 this.downListCombo.setValue('');
                             },
                         }],