fix: 修改活动模块添加/删除处理

src/pages/marketingManage/marketing/marketingActivitiesManagement/activePage/fixtures/components/ComponentTree/web.tsx

@@ -343,7 +343,10 @@ const WebComponentModule: React.FC<Iprops> = (props: Iprops) => {
       })
       return;
     }
-    const newKey = Object.keys(pageConfig).length + 1
+    const childNodes = [...pageConfig[0].childNodes];
+    childNodes.sort((a, b) => +a - +b);
+    
+    const newKey = childNodes[childNodes.length - 1]  + 1
 
     addChildComponent({
       newKey: `${newKey}`,