本文基于Laravel 4.2编写。1. 路由Hello World在app/routes.php里面添加下面代码，然后在浏览器里访问http://<laravel host prefix>/helloworld可以见到结果。 ```Route::get('/helloworld', function() { return '<html><body>hello world</body></html>';});```2. 视图（View）理论上可以把所有代码都写在app/routes.php里面，但是这会令代码难以维护。于是，我们可以把具体的页面内容搬到视图里，让路由文件简短一些。app/routes.php ```Route::get('/helloworld', function() { return View::make('helloworld');});app/views/helloworld.php <html> <body> hello world </body></html>```3. 控制器（Controller） 我们写的是动态网页，页面里有变量，变量通过Controller传入View。app/routes.php（这次我们的路由要先指向Controller，然后再由Controller返回View内容） Route::get('/helloworld', 'HelloworldController@say');app/controllers/HelloworldController.php ```<?phpclass HelloworldController extends BaseController { public function say() { $action = 'hello'; $name = 'kitty'; return View::make('hello.world', compact('action', 'name')); // hello.world表示hello目录里的world.php文件; 我们传入两个变量$action和$name }}```app/views/hello/world.php（这次我们放在一个子目录里，避免views目录文件太多） ```<html> <body> {{$action}} {{$name}} </body></html>```页面将显示“hello kitty”4. 模型（Model）随着业务逻辑的复杂，Controller文件会变长不好维护，那么我们可以把和数据库查询相关的逻辑分到模型层里，甚至可以安排一个擅长数据库表设计和写SQL的人专门负责这一层。app/routes.php ```Route::get('/helloworld', 'HelloworldController@say');app/controllers/HelloworldController.php <?phpclass HelloworldController extends BaseController { public function say() { $name = 'kitty'; $contacts = Contact::getContacts(); return View::make('hello.world', compact('name', 'contacts')); }}```app/models/Contact.php``` <?php// 假设有个表contacts(uid, name, phone)class Contact extends Eloquent { public $timestamps = false; protected $primaryKey = 'uid'; static public function createContact($uid, $name, $phone) { // 这个方法只是演示Model可能有些什么内容，并没有实际调用。 $item = new Contact; $item->uid = $uid; $item->name = $name; $item->phone = $phone; $item->save(); return $item; } // 假设有两行内容:(1, ‘kitty’, ‘800888’), (2, 'dingdong', '900999') static public function getContacts { return DB::table('contacts')->get(); }}```app/views/hello/world.blade.php（由于需要使用循环等超越HTML语法的功能，我们需要使用blade模板语言，文件名里需要添加blade部分） ```<html> <body>@foreach ($contacts as $contact) {{ $contact->name }}’s number is {{ $contact->phone }},@endforeach </body></html>```页面将显示“kitty's number is 800888, dingdong's number is 900999,”模板语言更多语法可参考：https://laravel.com/docs/4.2/templates至此，MVC（Model-View-Controller）的框架进化完成。
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