laravel Blade视图文件使用什么作为文件扩展名？
在laravel 中模板有强大的模板引擎是 Blade模板
所有 Blade 视图文件都将被编译成原生的 PHP 代码并缓存起来，除非它被修改，
否则不会重新编译，这就意味着 Blade 基本上不会给你的应用增加任何负担。
Blade 视图文件使用 .blade.php 作为文件扩展名，被存放在 resources/views 目录。
Blade模板有两个优点是模板继承跟区块；
继承布局
当定义视图是，可以使用Blade模板中@extends 命令来为视图指定应该 「继承」 的布局。
继承 Blade 布局的视图可使用 @section 命令将内容注入于布局的 @section中。
而「主」布局中使用 @yield 的地方会显示这些子视图中的 @section 间的内容：
@extends('layouts.app')
@section('title', 'Page Title')
@section('sidebar')
@parent
<p>这将追加到主布局的侧边栏。</p>
@endsection
@section('content')
<p>这是主体内容。</p>
@endsection我们可以将公共的部分代码选择用继承的方式，比如说 头部 底部 或者是左侧边栏 右侧边栏及其他有公共部分的地方
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