public function init() { Doo::loadClassAt('Category', 'default'); Doo::loadClassAt('City', 'default'); CategoryController::$dataTableUrl = adminAppUrl('operation/book/category/dataTable'); CategoryController::$addUrl = adminAppUrl('operation/book/category/add'); CategoryController::$modUrl = adminAppUrl('operation/book/category/mod?id='); CategoryController::$delUrl = adminAppUrl('operation/book/category/del?id='); CategoryController::$city = '<select class="m-wrap" name="city" id="city-element"><option value="0">' . L('顶级城市') . '</option>' . City::cateToOption($this->getUrlVar('city'), false) . '</select>'; }