Next.js 15 Fullstack Web Apps · 课时

页面、布局与路由基础

探索 App Router，定义页面、创建共享布局，并在应用程序的各个路由之间导航。

页面、布局与路由基础 是 CoddyKit 上的免费 Next.js 15 Fullstack Web Apps 课时。这是第 3 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Next.js 15 Fullstack Web Apps 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Next.js 15 Fullstack Web Apps 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Welcome to App Router

The App Router is Next.js 15's routing system, built on React Server Components. It lets you co-locate components, styles, and tests by route.

Routes from Your Files

Routing is filesystem-based: your folder structure inside app/ directly defines your URLs, keeping the project predictable.

Defining a Page

A page.js file inside a folder makes that route render. It exports the React component shown when a user visits that URL.

Code: Simple Page

Create app/page.js and it automatically becomes your home page at the / route. Here is the component that renders there.

export default function HomePage() {
  return (
    <div>
      <h1>Welcome to CoddyKit!</h1>
      <p>This is your Next.js home page.</p>
    </div>
  );
}

Organizing with Nested Routes

Build nested routes by nesting folders in app/ — each folder is a URL segment, so app/dashboard/settings/ maps to /dashboard/settings.

Code: Nested Page

To serve /dashboard/settings, create that folder path with a page.js inside. The file's component renders at that URL.

// app/dashboard/settings/page.js
export default function DashboardSettingsPage() {
  return (
    <div>
      <h2>Dashboard Settings</h2>
      <p>Manage your preferences here.</p>
    </div>
  );
}

Shared UI with Layouts

A layout (layout.js) is shared UI that wraps the pages in its segment — ideal for navbars, sidebars, and footers via the children prop.

Code: Root Layout

Every App Router project needs a root layout.js. It defines the base HTML — the <html> and <body> tags around your whole app.

// app/layout.js
import './globals.css'; // Global styles (optional)

export default function RootLayout({ children }) {
  return (
    <html lang="en">
      <body>
        <header>
          <nav>Home | About</nav>
        </header>
        <main>{children}</main> {/* Page content goes here */}
        <footer>&copy; 2024 CoddyKit</footer>
      </body>
    </html>
  );
}

Nested Layouts

Nested layouts apply only to their folder and subfolders, inheriting from parent layouts — so you can build hierarchical UI per section.

Linking Between Pages

Navigate with the <Link> component from next/link. It behaves like an anchor but does client-side routing — no full page reload.

// app/page.js (example usage)
import Link from 'next/link';

export default function HomePage() {
  return (
    <div>
      <h1>Welcome!</h1>
      <p>Go to the <Link href="/about">About Us</Link> page.</p>
      <p>Or visit your <Link href="/dashboard">Dashboard</Link>.</p>
    </div>
  );
}

Routing & Layouts Check

Which of the following statements about Next.js 15 App Router are TRUE?

Recap: Pages, Layouts & Routing

You learned the App Router: folders define routes, page.js renders content, layout.js shares UI, and <Link> handles fast navigation.

常见问题解答

「页面、布局与路由基础」课时是免费的吗？

是的 — 「页面、布局与路由基础」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Next.js 15 Fullstack Web Apps 课程的其余内容，请升级到 CoddyKit PRO。 Next.js 15 Fullstack Web Apps 课程共包含 4 节课。

「页面、布局与路由基础」这节课中我会学到什么？

探索 App Router，定义页面、创建共享布局，并在应用程序的各个路由之间导航。你通过在浏览器中直接运行的动手代码来练习 Next.js 15 Fullstack Web Apps，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Next.js 15 Fullstack Web Apps 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Next.js 15 Fullstack Web Apps 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 3 节课，共 4 节。

「页面、布局与路由基础」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Next.js 15 Fullstack Web Apps 课中编写并运行代码吗？

能。每节 Next.js 15 Fullstack Web Apps 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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