Laravel 安装 （Composer-安装）

前提：下载安装composer

composer 切换源

    //切换为国内
    composer config -g repo.packagist composer https://packagist.phpcomposer.com
    //切换为国外
    composer config -g repo.packagist composer https://packagist.org
    // 阿里云镜像
    composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

这里介绍laravel 5.5 版本的安装

    // 直接安装，默认安装的最新版
    composer create-project --prefer-dist laravel/laravel  （文件夹）
    // 安装5.5.*版本的 laravel
    composer create-project --prefer-dist laravel/laravel laravel 5.5.*