在application/config/routes.php中添加路由规则。
$route['default_controller'] ='pages/view';//默认controller
$route['(:any)'] ='pages/view/$1';
//(:num) 匹配数字
//(:any) 匹配任意字符
$route['products/([a-z]+)/(d+)'] ="$1/id_$2"
$route['404_override'] ='errors/page_missing';//设置处理错误的路由。
