feat(theme:menu): add getDefaultRedirect method

packages/theme/src/services/menu/index.en-US.md

@@ -27,6 +27,7 @@ This is because menus it's essential part of the applications, And it can be use
 | `open` | Open of the menu |
 | `toggleOpen` | Toggle menu open or close |
 | `openAll` | Toggle all menu open or close |
+| `getDefaultRedirect` | Returns a default menu link |
 
 **recursive**
 

packages/theme/src/services/menu/index.zh-CN.md

@@ -25,6 +25,7 @@ type: Service
 | `open` | 展开某菜单 |
 | `toggleOpen` | 切换菜单的展开或关闭 |
 | `openAll` | 展开或关闭所有菜单 |
+| `getDefaultRedirect` | 返回一个默认跳转的菜单链接 |
 
 **recursive**
 

packages/theme/src/services/menu/menu.service.spec.ts

@@ -315,6 +315,19 @@ describe('Service: Menu', () => {
       });
     });
 
+    describe('#getDefaultRedirect', () => {
+      beforeEach(() => srv.add(deepCopy(DATA)));
+      it('should be get first link', () => {
+        expect(srv.getDefaultRedirect()).toBe('/dashboard');
+      });
+      it('should be specifies whether the jump link is valid', () => {
+        expect(srv.getDefaultRedirect({ redirectUrl: '/dashboard/v1' })).toBe('/dashboard/v1');
+      });
+      it('should be return first link when redirectUrl is invalid', () => {
+        expect(srv.getDefaultRedirect({ redirectUrl: '/dashboard/invalid' })).toBe('/dashboard');
+      });
+    });
+
     describe('#find', () => {
       beforeEach(() => srv.add(deepCopy(DATA)));
       it('via key', () => {

packages/theme/src/services/menu/menu.service.ts

@@ -34,6 +34,24 @@ export class MenuService implements OnDestroy {
     return this.data;
   }
 
+  /**
+   * Returns a default menu link
+   *
+   * 返回一个默认跳转的菜单链接
+   */
+  getDefaultRedirect(opt: { redirectUrl?: string } = {}): string | null | undefined {
+    let ret: string | null | undefined;
+    this.visit(this.menus, (item: MenuInner) => {
+      if (typeof item.link !== 'string' || item.link.length <= 0 || !item._aclResult || item._hidden === true) {
+        return;
+      }
+      if (ret == null || ret.length <= 0 || item.link == opt?.redirectUrl) {
+        ret = item.link;
+      }
+    });
+    return ret;
+  }
+
   visit<T extends Menu = Menu>(data: T[], callback: (item: T, parentMenum: T | null, depth?: number) => void): void;
   visit(data: Menu[], callback: (item: Menu, parentMenum: Menu | null, depth?: number) => void): void;
   visit(data: Menu[], callback: (item: Menu, parentMenum: Menu | null, depth?: number) => void): void {