之前都是写在$(function(){})里面的，可以进行单击响应。为什么到了“修改数量”操作写在外面，用了onclick=“”来书写。
我是否仍然可以写在$(function(){})里面
老师，这个c：是什么意思呀，为什么出现在这里
老师，idea试用期到了该怎么办啊？
版本是IntelliJ IDEA 2020.3.2 x64
老师，我这个代码是出了什么问题呢，运行后总是显示错误
w请问一下老师为什么我的程序会报错？代码跟老师讲的基本上一样
工厂模式.png
老师，为什么在这里BYD类的代码也打印出来了？
老师，我这个程序运行既没有显示运行结果，也没有报错，重新编写了一次仍然是这样，这个原因是什么？
老师，你好：
我按照示例代码写了经典写法，运行不报错，但是不弹出框架，查找了好久，找不出来
from tkinter import * from tkinter import messagebox class Application(Frame): # 经典的GUI程序类的写法 def __init__(self,master=None): super().__init__(master) #显示调用父类Frame的init方法 self.master = master self.pack() self.createWidget() # 统一调用组件的方法 def createWidget(self): # 创建组件，点击送花 self.btn01 = Button(self) self.btn01['text'] = '点击送花' self.btn01.pack() self.btn01['command'] = self.songhua #送花函数 #创建一个退出按钮 self.btnquit = Button(self,text='退出',command=root.destroy) self.btnquit.pack() def songhua(self): messagebox.showinfo('送花','送你99朵玫瑰花') if __name__== "_main__": root = Tk() root.geometry('400x250+200+200') root.title('一个经典的GuI程序类的测试') app = Application(master=root) root.mainloop()
老师帮忙看看这个报错
服务器报错信息
24-Feb-2021 19:34:06.220 严重 [http-nio-8080-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为/webdemo_war的上下文中，Servlet[com.example.webdemo.web.servlet.UserLoginServlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常 java.util.MissingResourceException: Can't find bundle for base name db, locale zh_CN at java.base/java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:2055) at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1689) at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1593) at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1556) at java.base/java.util.ResourceBundle.getBundle(ResourceBundle.java:857) at com.example.webdemo.commons.JdbcUtils.<clinit>(JdbcUtils.java:14) at com.example.webdemo.dao.impl.UserLoginDaoImpl.selectUsersByUserNameAndUserPwd(UserLoginDaoImpl.java:17) at com.example.webdemo.service.impl.UserLoginServiceImpl.userLogin(UserLoginServiceImpl.java:14) at com.example.webdemo.web.servlet.UserLoginServlet.doPost(UserLoginServlet.java:30) at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:832) 24-Feb-2021 19:34:10.829 严重 [http-nio-8080-exec-6] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为/webdemo_war的上下文中，Servlet[com.example.webdemo.web.servlet.UserLoginServlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常 java.lang.NoClassDefFoundError: Could not initialize class com.example.webdemo.commons.JdbcUtils at com.example.webdemo.dao.impl.UserLoginDaoImpl.selectUsersByUserNameAndUserPwd(UserLoginDaoImpl.java:17) at com.example.webdemo.service.impl.UserLoginServiceImpl.userLogin(UserLoginServiceImpl.java:14) at com.example.webdemo.web.servlet.UserLoginServlet.doPost(UserLoginServlet.java:30) at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:832) 24-Feb-2021 19:35:33.939 严重 [http-nio-8080-exec-8] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为/webdemo_war的上下文中，Servlet[com.example.webdemo.web.servlet.UserLoginServlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常 java.lang.NoClassDefFoundError: Could not initialize class com.example.webdemo.commons.JdbcUtils at com.example.webdemo.dao.impl.UserLoginDaoImpl.selectUsersByUserNameAndUserPwd(UserLoginDaoImpl.java:17) at com.example.webdemo.service.impl.UserLoginServiceImpl.userLogin(UserLoginServiceImpl.java:14) at com.example.webdemo.web.servlet.UserLoginServlet.doPost(UserLoginServlet.java:30) at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:832) 24-Feb-2021 19:35:40.832 严重 [http-nio-8080-exec-9] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为/webdemo_war的上下文中，Servlet[com.example.webdemo.web.servlet.UserLoginServlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常 java.lang.NoClassDefFoundError: Could not initialize class com.example.webdemo.commons.JdbcUtils at com.example.webdemo.dao.impl.UserLoginDaoImpl.selectUsersByUserNameAndUserPwd(UserLoginDaoImpl.java:17) at com.example.webdemo.service.impl.UserLoginServiceImpl.userLogin(UserLoginServiceImpl.java:14) at com.example.webdemo.web.servlet.UserLoginServlet.doPost(UserLoginServlet.java:30) at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:832) 24-Feb-2021 19:35:49.856 严重 [http-nio-8080-exec-10] org.apache.catalina.core.StandardWrapperValve.invoke 在路径为/webdemo_war的上下文中，Servlet[com.example.webdemo.web.servlet.UserLoginServlet]的Servlet.service（）引发了具有根本原因的异常Servlet执行抛出一个异常 java.lang.NoClassDefFoundError: Could not initialize class com.example.webdemo.commons.JdbcUtils at com.example.webdemo.dao.impl.UserLoginDaoImpl.selectUsersByUserNameAndUserPwd(UserLoginDaoImpl.java:17) at com.example.webdemo.service.impl.UserLoginServiceImpl.userLogin(UserLoginServiceImpl.java:14) at com.example.webdemo.web.servlet.UserLoginServlet.doPost(UserLoginServlet.java:30) at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:832)
webdemo.rar
老师，这个-r的位置 视频里操作和文档里面的不一样，意思是-r的位置在哪都可以吗？
运算符重载.png老师图片中红色部分没理解。
老师请问这里的底数是不是忘记写了，对数函数应该要有底数的啊
老师我为什么创建maven文件时候的包导不进去，已经按照老师那样的做了是我jdk15的问题吗？还是别的原因，我实在找不出来，不知道怎么回事
turtle.showturtle() AttributeError: partially initialized module 'turtle' has no attribute 'showturtle' (most likely due to a circular import)
出现如下报错
这里是不是包没配置对啊？
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w
请问一下老师为什么我的程序会报错？代码跟老师讲的基本上一样
老师，这个-r的位置 视频里操作和文档里面的不一样，意思是-r的位置在哪都可以吗？
京公网安备 11011402011233号
