常用 Blade 语法
在 Blade 模版页面，我们常用 @section 命令定义一个内容区块，用 @yield 命令显示指定区块的内容等等，后续我们探讨如何写定制的 Blade命令。
定制个性 Blade
修改 welcome.blade.php 页面：
<!DOCTYPEhtml><html> <head> <title>Laravel</title> </head> <body> @hello </body></html>
修改 AppServiceProvider.php,新增自定义的 hello 指令:
class AppServiceProvider extends ServiceProvider{ /** * Bootstrap any application services. * * @return void */ public function boot() { // 新增 hello blade Blade::directive('hello', function(){ return 'hello word'; }); } /** * Register any application services. * * @return void */ public function register() { // }}
这时我们访问首页面效果如下图：
修改 AppServiceProvider.php 中代码如下：
public function boot() { // 新增 hello blade Blade::directive('hello', function(){// return 'hello word1'; return '<?= "hello universe"; ?>'; }); }
访问结果却并没有变化，这是因为 Laravel 的页面缓存。运行 php artisan view:clear 清理缓存后再次访问，效果如下图：
Blade 中参数处理
修改 welcome.blade.php 页面：
<!DOCTYPEhtml><html> <head> <title>Laravel</title> </head> <body> @hello('world') </body></html> 修改 AppServiceProvider.php 中 boot 方法，接受传入 $expression 参数：
public function boot() { // 新增 hello blade Blade::directive('hello', function($expression){ return "<?= 'hello '. $expression; ?>"; }); }
这时我们访问首页面效果如下图：
实际访问路径为：/storage/framework/views/下的缓存文件。
Blade 中 对象传递
修改 route.php 页面，传递 user 变量：
Route::get('/', function(){ return view('welcome')->with('user', App\User::first());}); 修改 welcome.blade.php 页面，接受 $user ：
<!DOCTYPEhtml><html> <head> <title>Laravel</title> </head> <body> @ago($user) </body></html>
修改 AppServiceProvider.php ，处理 $user ：
public function boot() { // 新增 hello blade Blade::directive('ago', function($expression){ dd($expression); }); }
这时我们访问首页面效果如下图：
Blade 中 with 辅助函数
如何让对象正常显示呢，这里我们借助 with 辅助函数：
public function boot() { // 新增 hello blade Blade::directive('ago', function($expression){ return "<?= with{$expression}->updated_at->diffForHumans(); ?>"; }); }
访问效果如下图：
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