李文凯老师 关于TP添加后跳转的问题

老师您好，这样的，我想在添加成功后返回index，但是不知道redirect应该放在哪里。恳请老师或者各位高手回答

复制代码         public function insert() {         $form    =    M("user");         if($vo = $form->create()) {             $form->password = md5($form->password);             $list = $form->add();             if($list) {                 $this->success("插入成功");                 //$this->redirect('index');             } else {                 $this->error("插入失败");                 }             } else {                 $this->error($form->geterror());                 }              }

            public function insert() {
            $form    =    M("user");
            if($vo = $form->create()) {
                $form->password = md5($form->password);
                $list = $form->add();
                if($list) {
                   //$this->success("插入成功");
$this->redirect('index');
                } else {
                    $this->error("插入失败");
                    }
                } else {
                    $this->error($form->geterror());
                    }
          

        }