终于找到解决方案了... 谷歌帮了忙... config/main.php 加上

return [
    //...
    'components' => [
        //...
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'suffix' => '.html',
            'rules' => [
                // URL 重写
                "<controller:\w+>/<action:\w+>/<page:\d+>" => "<controller>/<action>",
            ],
        ],
    //...