1. 程序初始化注册文件，加入如下：
'urlManager' =>[
'class' => 'yii\web\UrlManager',
'showScriptName' =>false,
'enablePrettyUrl' => true,
]
2. 入口同级目录增加 .htaccess，内容如下
RewriteEngine on
# If a directory or a file exists, use it directly
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# Otherwise forward it to index.php
RewriteRule . index.php