$app
$app : \think\route\App
应用对象
$request : \think\Request
请求对象
$rule : \think\route\Rule
路由规则
__construct(\think\Request $request, \think\route\Rule $rule, $dispatch, $param = array(), $code = null)
| \think\Request | $request | |
| \think\route\Rule | $rule | |
| $dispatch | ||
| $param | ||
| $code |