func：完成增删与界面的匹配。

MainWidget.h

@@ -28,19 +28,21 @@ public:
     void push_content(const std::vector<Element_t*>& eles, std::size_t page = 1);
 
 private:
-    void       read();
-    void       search();
-    void       item_changed_handle(QTableWidgetItem* item);
-    void       save();
-    void       copy_select_line();
-    void       del_select_line();
-    Element_t* get_current_select_key();
-    void       reset();
-    void       judge_btn_page();
-    void       copy_key();
+    void read();
+    void search();
+    void item_changed_handle(QTableWidgetItem* item);
+    void save();
+    void copy_select_line();
+    void insert_one_line(Element_t* ele, int row);
+    void del_select_line();
+    void reset();
+    void judge_btn_page();
+    void copy_key();
 
 private:
-    Element_t* get_element_bykey(const QString& key);
+    Element_t*        get_element_bykey(const QString& key);
+    Element_t*        get_current_select_key();
+    QTableWidgetItem* get_current_select_item();
 
 private:
     Ui::MainWidget*          ui;