关于若依项目调试出现的问题：
Hbiuld启动项目报如下错误：
Proxy error: Could not proxy request /logout from localhost to http://localhost:81/. See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (ECONNREFUSED).
启动前端项目，报404异常。
系统接口404异常
初步断定是端口号问题
更改前端端口号后，报500错误.更改vue.config.js的后台端口，
前端两处位置：在vue.config.js文件中
const port = process.env.port || process.env.npm_config_port || 8092 // 端口 target: `http://localhost:8092`,
后端一处位置：在application.yml文件中
server: # 服务器的HTTP端口，默认为8080 port: 8092
顺利进入页面，报如下错误：
Error querying database. Cause: java.sql.SQLSyntaxErrorException: Unknown column 'type' in 'field list'
Hbuild启动项目报错误：
When `proxy` in package.json is an object, each `context` object must have a `target` property specified as a url string
启动后端项目：
尝试一个端口，端口占用，
尝试另一个端口，端口也被占用
escription: Web server failed to start. Port 8088 was already in use. Action: Identify and stop the process that's listening on port 8088 or configure this application to listen on another port. Disconnected from the target VM, address: '127.0.0.1:56493', transport: 'socket' Process finished with exit code 1
Web server failed to start. Port 8090 was already in use. Description: Web server failed to start. Port 8090 was already in use. Action: Identify and stop the process that's listening on port 8090 or configure this application to listen on another port. Disconnected from the target VM, address: '127.0.0.1:64665', transport: 'socket' Process finished with exit code 1
Web server failed to start. Port 80 was already in use. Description: Web server failed to start. Port 80 was already in use. Action: Identify and stop the process that's listening on port 80 or configure this application to listen on another port. Disconnected from the target VM, address: '127.0.0.1:64728', transport: 'socket' Process finished with exit code 1
解决方法：
重启电脑，回退版本，重新更改前后端口号为8090，发现vue.config.js的proxy中target没写，示例：
target: `http://localhost:8090`,
加上之后，解决！
问题：Hbuilder定义8090接口，为什么打开的是8091？Hbuilder定义8092接口，为什么打开的是8093？
注意：每次前端要改两个地方：
解答：
使用：
看起来正常了，点击运行：
回退版本：
解决了
通过本次事件，学到了：前端target里面写的是设定的后端地址，可以和后端地址的port一样，
const post 里面是前端地址，不能和后端地址设定的一样，不然会报错。
windows环境下如何干掉进程？
netstat -o -n -a | findstr:端口号 taskill /F /PID 序列号
如图：
