搭建一个简单的SpringBoot+Vue+MySQL | (集成MyBatis-Plus、lombok、Swagger)
创建SpringBoot项目(Java、SpringBoot、SpringMVC、RESTful、json)、引入Swagger(接口文档和测试页面生成工具)、定义统一结果(让前后端数据通信更规范)创建和连接数据库(MySQL、IDEA内置的数据库管理工具)集成MyBatis-Plus(MyBatis)搭建前端环境HTML和CSS、熟悉JavaScript、了解Vue)认识 Vue.js、Spri
案例项目的创建
步骤:
- 创建SpringBoot项目(Java、SpringBoot、SpringMVC、RESTful、json)
- 引入Swagger(接口文档和测试页面生成工具)
- 定义统一结果(让前后端数据通信更规范)
- 创建和连接数据库(MySQL、IDEA内置的数据库管理工具)
- 集成MyBatis-Plus(MyBatis)
- 搭建前端环境(了解HTML和CSS、熟悉JavaScript、了解Vue)
- 认识 Vue.js
- SpringBoot+Vue
- Java、MyBatis-Plus、MySQL、HTML
- JavaScript、Vue
1、创建SpringBoot项目
1.1、新建项目
注意:Java版本选择8,选择maven
spring Boot版本2.3.X.RELEASE
1.2、添加依赖
添加SpringBoot web依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
1.3、配置application.yml文件
server:
port: 8090 # 服务端口
spring:
application: # 应用的名字
name: payment
1.4、创建controller
创建controller包,创建ProductController类
package com.ymj.paymentdemo.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/api/product")
@CrossOrigin //跨域
public class ProductController {
@GetMapping("/test")
public String test(){
return "hello";
}
}
修改Swagger2Config文档标题
package com.ymj.payment.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.ApiSelectorBuilder;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration
@EnableSwagger2
public class Swagger2Config {
@Bean
public Docket docket(){
return new Docket(DocumentationType.SWAGGER_2).apiInfo(new ApiInfoBuilder().title("微信支付案例接口文档").build());
}
}
1.5、测试
访问:http://localhost:8090/api/product/test
2、引入Swagger
作用:自动生成接口文档和测试页面。
2.1、引入依赖
<!--swagger-->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>
<!--swagger ui-->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>
2.2、Swagger配置文件
创建confifig包,创建Swagger2Confifig类
package com.ymj.paymentdemo.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration
@EnableSwagger2
public class Swagger2Config {
@Bean
public Docket docket(){
return new Docket(DocumentationType.SWAGGER_2)
.apiInfo(new ApiInfoBuilder().title("微信支付案例接口文
档").build());
}
}
2.3、Swagger注解
controller中可以添加常用注解
@Api(tags="商品管理") //用在类上
@ApiOperation("测试接口") //用在方法上
2.4、测试
访问:http://localhost:8090/swagger-ui.html
3、定义统一结果
作用:定义统一响应结果,为前端返回标准格式的数据。
3.1、引入lombok依赖
简化实体类的开发
<!--实体对象工具类:低版本idea需要安装lombok插件-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
3.2、创建R类
创建统一结果类
package com.ymj.paymentdemo.vo;
import lombok.NoArgsConstructor;
import lombok.Setter;
import java.util.HashMap;
import java.util.Map;
@Data //生成set、get等方法
public class R {
private Integer code;
private String message;
private Map<String, Object> data = new HashMap<>();
public static R ok(){
R r = new R();
r.setCode(0);
r.setMessage("成功");
return r;
}
public static R error(){
R r = new R();
r.setCode(-1);
r.setMessage("失败");
return r;
}
public R data(String key, Object value){
this.data.put(key, value);
return this;
}
}
3.3、修改controller
package com.ymj.payment.controller;
import com.ymj.payment.vo.R;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;
@Api(tags = "商品管理")
@RestController
@RequestMapping("/api/product")
public class ProductController {
@ApiOperation("测试接口")
@GetMapping("/test")
public R test(){
return R.ok().data("message","hello").data("now",new Date());
}
}
3.4、配置json时间格式
server:
port: 8090 # 服务端口
spring:
application: # 应用的名字
name: payment
jackson: # json时间格式
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT+8
3.5、Swagger测试
4、创建数据库
4.1、创建数据库
mysql -uroot -p
mysql> create database payment_demo;
4.2、IDEA配置数据库连接
(1)打开数据库面板
(2)添加数据库
(3)配置数据库连接参数
4.3、执行SQL脚本
payment_demo.sql
CREATE TABLE `t_order_info` (
`id` bigint(11) unsigned NOT NULL AUTO_INCREMENT COMMENT '订单id',
`title` varchar(256) DEFAULT NULL COMMENT '订单标题',
`order_no` varchar(50) DEFAULT NULL COMMENT '商户订单编号',
`user_id` bigint(20) DEFAULT NULL COMMENT '用户id',
`product_id` bigint(20) DEFAULT NULL COMMENT '支付产品id',
`total_fee` int(11) DEFAULT NULL COMMENT '订单金额(分)',
`code_url` varchar(50) DEFAULT NULL COMMENT '订单二维码连接',
`order_status` varchar(10) DEFAULT NULL COMMENT '订单状态',
`create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
/*Table structure for table `t_payment_info` */
CREATE TABLE `t_payment_info` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '支付记录id',
`order_no` varchar(50) DEFAULT NULL COMMENT '商户订单编号',
`transaction_id` varchar(50) DEFAULT NULL COMMENT '支付系统交易编号',
`payment_type` varchar(20) DEFAULT NULL COMMENT '支付类型',
`trade_type` varchar(20) DEFAULT NULL COMMENT '交易类型',
`trade_state` varchar(50) DEFAULT NULL COMMENT '交易状态',
`payer_total` int(11) DEFAULT NULL COMMENT '支付金额(分)',
`content` text COMMENT '通知参数',
`create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
/*Table structure for table `t_product` */
CREATE TABLE `t_product` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '商品id',
`title` varchar(20) DEFAULT NULL COMMENT '商品名称',
`price` int(11) DEFAULT NULL COMMENT '价格(分)',
`create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
/*Data for the table `t_product` */
insert into `t_product`(`title`,`price`) values ('Java课程',1);
insert into `t_product`(`title`,`price`) values ('大数据课程',1);
insert into `t_product`(`title`,`price`) values ('前端课程',1);
insert into `t_product`(`title`,`price`) values ('UI课程',1);
/*Table structure for table `t_refund_info` */
CREATE TABLE `t_refund_info` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '退款单id',
`order_no` varchar(50) DEFAULT NULL COMMENT '商户订单编号',
`refund_no` varchar(50) DEFAULT NULL COMMENT '商户退款单编号',
`refund_id` varchar(50) DEFAULT NULL COMMENT '支付系统退款单号',
`total_fee` int(11) DEFAULT NULL COMMENT '原订单金额(分)',
`refund` int(11) DEFAULT NULL COMMENT '退款金额(分)',
`reason` varchar(50) DEFAULT NULL COMMENT '退款原因',
`refund_status` varchar(10) DEFAULT NULL COMMENT '退款状态',
`content_return` text COMMENT '申请退款返回参数',
`content_notify` text COMMENT '退款结果通知参数',
`create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;
5、集成MyBatis-Plus
5.1、引入依赖
<!--mysql驱动 默认8,5.7以上包名加cj-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!--持久层 Mybatis-Flus:是mybatis的增强-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1</version>
</dependency>
5.2、配置数据库连接
spring:
datasource: # mysql数据库连接
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/payment?serverTimezone=GMT%2B8&characterEncoding=utf-8
username: root
password: 123456
server:
port: 8090 # 服务端口
spring:
application: # 应用的名字
name: payment
jackson: # json时间格式
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT+8
datasource: # mysql数据库连接
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/payment?serverTimezone=GMT%2B8&characterEncoding=utf-8
username: root
password: 123456
5.3、定义实体类(entity)
BaseEntity是父类,其他类继承BaseEntity
BaseEntity.java
package com.ymj.payment.entity;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import java.util.Date;
@Data
public class BaseEntity {
//定义主键策略:跟随数据库的主键自增
@TableId(value = "id", type = IdType.AUTO)
private String id; //主键
private Date createTime;//创建时间
private Date updateTime;//更新时间
}
OrderInfo.java
package com.ymj.payment.entity;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
@Data
@TableName("t_order_info")
public class OrderInfo extends BaseEntity{
private String title;//订单标题
private String orderNo;//商户订单编号
private Long userId;//用户id
private Long productId;//支付产品id
private Integer totalFee;//订单金额(分)
private String codeUrl;//订单二维码连接
private String orderStatus;//订单状态
}
PaymentInfo.java
package com.ymj.payment.entity;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
@Data
@TableName("t_payment_info")
public class PaymentInfo extends BaseEntity{
private String orderNo;//商品订单编号
private String transactionId;//支付系统交易编号
private String paymentType;//支付类型
private String tradeType;//交易类型
private String tradeState;//交易状态
private Integer payerTotal;//支付金额(分)
private String content;//通知参数
}
Product.java
package com.ymj.payment.entity;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
@Data
@TableName("t_product")
public class Product extends BaseEntity{
private String title; //商品名称
private Integer price; //价格(分)
}
RefundInfo.java
package com.ymj.payment.entity;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
@Data
@TableName("t_refund_info")
public class RefundInfo extends BaseEntity{
private String orderNo;//商品订单编号
private String refundNo;//退款单编号
private String refundId;//支付系统退款单号
private Integer totalFee;//原订单金额(分)
private Integer refund;//退款金额(分)
private String reason;//退款原因
private String refundStatus;//退款单状态
private String contentReturn;//申请退款返回参数
private String contentNotify;//退款结果通知参数
}
5.4、定义持久层(mapper)
定义Mapper接口继承 BaseMapper<>,
定义xml配置文件
使用了mybatisplus继承BaseMapper
OrderInfoMapper.java
package com.ymj.payment.mapper;
import com.ymj.payment.entity.OrderInfo;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
public interface OrderInfoMapper extends BaseMapper<OrderInfo> {
}
PaymentInfoMapper.java
package com.ymj.payment.mapper;
import com.ymj.payment.entity.PaymentInfo;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
public interface PaymentInfoMapper extends BaseMapper<PaymentInfo> {
}
ProductMapper.java
package com.ymj.payment.mapper;
import com.ymj.payment.entity.Product;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
public interface ProductMapper extends BaseMapper<Product> {
}
RefundInfoMapper.java
package com.ymj.payment.mapper;
import com.ymj.payment.entity.RefundInfo;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
public interface RefundInfoMapper extends BaseMapper<RefundInfo> {
}
xml
OrderInfoMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ymj.payment.com.ymj.payment.mapper.OrderInfoMapper">
</mapper>
PaymentInfoMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ymj.payment.com.ymj.payment.mapper.PaymentInfoMapper">
</mapper>
ProductMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ymj.payment.com.ymj.payment.mapper.ProductMapper">
</mapper>
RefundInfoMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ymj.payment.com.ymj.payment.mapper.RefundInfoMapper">
</mapper>
5.5、定义业务层(service)
定义业务层接口继承 IService<>
定义业务层接口的实现类,并继承 ServiceImpl<,>
RefundInfoService.java
package com.ymj.payment.service;
import com.ymj.payment.entity.RefundInfo;
import com.baomidou.mybatisplus.extension.service.IService;
public interface RefundInfoService extends IService<RefundInfo> {
}
OrderInfoService.java
package com.ymj.payment.service;
import com.ymj.payment.entity.OrderInfo;
import com.baomidou.mybatisplus.extension.service.IService;
public interface OrderInfoService extends IService<OrderInfo> {
}
PaymentInfoService.java
package com.ymj.payment.service;
public interface PaymentInfoService {
}
ProductService.java
package com.ymj.payment.service;
import com.ymj.payment.entity.Product;
import com.baomidou.mybatisplus.extension.service.IService;
public interface ProductService extends IService<Product> {
}
impl
OrderInfoServiceImpl.java
package com.ymj.payment.service.impl;
import com.ymj.payment.entity.OrderInfo;
import com.ymj.payment.mapper.OrderInfoMapper;
import com.ymj.payment.service.OrderInfoService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
@Service
public class OrderInfoServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfo> implements OrderInfoService {
}
PaymentInfoServiceImpl.java
package com.ymj.payment.service.impl;
import com.ymj.payment.entity.PaymentInfo;
import com.ymj.payment.mapper.PaymentInfoMapper;
import com.ymj.payment.service.PaymentInfoService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
@Service
public class PaymentInfoServiceImpl extends ServiceImpl<PaymentInfoMapper, PaymentInfo> implements PaymentInfoService {
}
ProductServiceImpl.java
package com.ymj.payment.service.impl;
import com.ymj.payment.entity.Product;
import com.ymj.payment.mapper.ProductMapper;
import com.ymj.payment.service.ProductService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
@Service
public class ProductServiceImpl extends ServiceImpl<ProductMapper, Product> implements ProductService {
}
RefundInfoServiceImpl.java
package com.ymj.payment.service.impl;
import com.ymj.payment.entity.RefundInfo;
import com.ymj.payment.mapper.RefundInfoMapper;
import com.ymj.payment.service.RefundInfoService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
@Service
public class RefundInfoServiceImpl extends ServiceImpl<RefundInfoMapper, RefundInfo> implements RefundInfoService {
}
5.6、定义yml配置文件
为了方便调试,在配置中加上SQL日志(添加持久层日志和xml文件位置的配置)
mybatis-plus:
configuration: # sql日志
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
mapper-locations: classpath:com/ymj/payment/mapper/xml/*.xml
完整的配置:
server:
port: 8090 # 服务端口
spring:
application: # 应用的名字
name: payment
jackson: # json时间格式
date-format: yyyy-MM-dd HH:mm:ss
time-zone: GMT+8
datasource: # mysql数据库连接
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/payment?serverTimezone=GMT%2B8&characterEncoding=utf-8
username: root
password: 123456
mybatis-plus:
configuration: # sql日志
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
mapper-locations: classpath:com/ymj/payment/mapper/xml/*.xml
5.7、定义MyBatis-Plus的配置文件
在confifig包中创建配置文件 MybatisPlusConfifig
package com.atguigu.paymentdemo.config;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@Configuration
@MapperScan("com.ymj.payment.mapper") //持久层扫描
@EnableTransactionManagement //启用事务管理
public class MybatisPlusConfig {
}
5.8、定义接口方法查询所有商品
ProductController中添加一个查询商品列表的接口进行测试
package com.ymj.payment.controller;
import com.ymj.payment.entity.Product;
import com.ymj.payment.service.ProductService;
import com.ymj.payment.vo.R;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.Date;
import java.util.List;
@Api(tags = "商品管理")
@RestController
@RequestMapping("/api/product")
public class ProductController {
@Resource
private ProductService productService;
@ApiOperation("测试接口")
@GetMapping("/test")
public R test(){
return R.ok().data("message","hello").data("now",new Date());
}
@ApiOperation("商品列表")
@GetMapping("/list")
public R list(){
List<Product> list = productService.list();
return R.ok().data("productList",list);
}
}
在 public class ProductController 中添加一个方法
@Resource
private ProductService productService;
@ApiOperation("商品列表")
@GetMapping("/list")
public R list(){
List<Product> list = productService.list();
return R.ok().data("productList", list);
}
**5.9、Swagger中测试 **
**5.10、pom中配置build节点 **
因为maven工程在默认情况下 src/main/java 目录下的所有资源文件是不发布到 target 目录下的,我们 在 pom 文件的 节点下配置一个资源发布过滤器
<!-- 项目打包时会将java目录中的*.xml文件也进行打包 -->
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
6、搭建前端环境
6.1、安装Node.js
Node.js是一个基于JavaScript引擎的服务器端环境,前端项目在开发环境下要基于Node.js来运行
安装:node-v14.18.0-x64.msi
6.2、运行前端项目
将项目放在磁盘的一个目录中,例如 D:\demo\payment-demo-front
进入项目目录,运行下面的命令启动项目
npm run serve
6.3、安装VSCode
如果你希望方便的查看和修改前端代码,可以安装一个VSCode
安装:VSCodeUserSetup-x64-1.56.2
安装插件:
7、Vue.js入门
官网:https://cn.vuejs.org/
Vue.js是一个前端框架,帮助我们快速构建前端项目。
使用vue有两种方式,一个是传统的在 html 文件中引入 js 脚本文件的方式,另一个是脚手架的方式。
我们的项目,使用的是脚手架的方式。
7.1、安装脚手架
配置淘宝镜像
#经过下面的配置,所有的 npm install 都会经过淘宝的镜像地址下载
npm config set registry https://registry.npm.taobao.org
全局安装脚手架
npm install -g @vue/cli
7.2、创建一个项目
先进入项目目录(Ctrl + ~),然后创建一个项目
vue create vue-demo
7.3、运行项目
npm run serve
指定运行端口
npm run serve – --port 8888
7.4、数据绑定
修改 src/App.vue
<!--定义页面结构-->
<template>
<div>
<h1>Vue案例</h1>
<!-- 插值 -->
<p>{{course}}</p>
</div>
</template>
<!--定义页面脚本-->
<script>
export default {
// 定义数据
data () {
return {
course: '微信支付'
}
}
}
</script>
7.5、安装Vue调试工具
在Chrome的扩展程序中安装:Vue.jsDevtools.zip
(1)扩展程序的安装
(2)扩展程序的使用
7.6、双向数据绑定
数据会绑定到组件,组件的改变也会影响数据定义
<p>
<!-- 指令 -->
<input type="text" v-model="course">
</p>
7.7、事件处理
(1)定义事件
// 定义方法
methods: {
toPay(){
console.log('去支付')
}
}
(2)调用事件
<p>
<!-- 事件 -->
<button @click="toPay()">去支付</button>
</p>
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