net里js换行 未结束的字符串常量

                string str = @"<script type=text/javascript>alert('购买成功！";
                str += @"/n您本次的订单号为：" + rid;
                str += @"/n共购买了" + total.ToString() + "件产品,总计" + all + "元');</script>";
                Response.Write(str);