有效沟通问答-【官方】百战程序员_IT在线教育培训机构

import re
import requests
url = 'https://www.duitang.com/napi/blog/list/by_search/?kw=陈钰琪&type=feed&include_fields=top_comments,is_root,source_link,item,buyable,root_id,status,like_count,like_id,sender,album,reply_count,favorite_blog_id&_type=&start=24&_=1602406546709'
zhao = requests.get(url).content.decode('utf-8')
print(zhao)
patten = r'https:.jpg|https:.jpeg|https:.png'
p = re.findall(patten,zhao)
for i in p:
    print(i)

老师怎么匹配，抓出来了，匹配不上

Python 全系列/第四阶段：函数式编程和核心特性/正则表达式 28861楼

老师，我重新把项目导进去然后运行出现以下错误

于是我将那个XML文件复制一份到我的D盘下，路径给的是绝对路径，成功运行之后发现并没有生成对应的包和类，求老师解答

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 28862楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document节点练习</title>
    <!--<style type="text/css">
        ul{
            list-style: none;margin: 0;padding: 0;
        }
        ul li{
            display: inline-block;width: 100px;height: 30px;line-height: 30px;text-align: center;background-color: #0086b3;
        }
        li a{

        }
        li:hover{
            background-color: #0077aa;
        }
        li a:hover{
            color:red;
        }
    </style>-->
    <style>
        li:hover{background-color: #b3d4fc}
        li a:hover{color:red}
    </style>
</head>
<body>
<!--<ul>
    <li><a href="#">首页</a></li>
    <li><a href="#">新闻</a></li>
    <li><a href="#">军事</a></li>
    <li><a href="#">娱乐</a></li>
</ul>-->
<script>
    var arr=["首页","新闻","军事","娱乐"]
    var ulText=document.createElement('ul');
    var ulText_style= document.createAttribute('style');
    ulText_style.value="list-style: none;margin: 0;padding: 0;";
    ulText.setAttributeNode(ulText_style);
    for(var i=0;i<arr.length;i++){
        var liText=document.createElement('li');
        var liText_style= document.createAttribute('style');
        liText_style.value='display:inline-block;width:100px;height:30px;line-height:30px;\
                             text-align:center;margin-left:5px';
        liText.setAttributeNode(liText_style);

        var aText=document.createElement('a');
        var aText_style= document.createAttribute('style');
        aText_style.value="text-decoration: none;";
        aText.setAttributeNode(aText_style);
        aText.innerHTML=arr[i];
        liText.appendChild(aText);
        ulText.appendChild(liText);
    }
    document.body.appendChild(ulText);
    var arr2 = ['cnode社区也切换到let\'s encrypt了','【深圳】nodeparty 2016.04.09总结','国内nodejs2015','展望nodejs 2016','基础javascript'];
    var ul1 = document.createElement('ul');
    var ul1_style = document.createAttribute('style');
    ul1_style.value = 'height: 30px;list-style: none;padding: 0;margin: 0;';
    ul1.setAttributeNode(ul1_style);
    document.body.appendChild(ul1);
    for (var j =0;j<arr2.length;j++){
        var li1 = document.createElement('li');
        var li1_style = document.createAttribute('style');
        li1_style.value = "height: 30px;line-height: 30px;text-align: left;border-bottom: 1px solid gainsboro;";

        li1.setAttributeNode(li1_style);
        var a1 = document.createElement('a');
        a1.innerHTML = arr2[j];
        li1.appendChild(a1);
        ul1.appendChild(li1);
    }
</script>
</body>
</html>

这样写的话应该是没有什么问题的吧

WEB前端全系列/第二阶段：JavaScript编程模块/DOM模型 28863楼

老师，视频中讲了通过用户id查询，我试着写了根据性别查询。但是代码报错找不到哪里错了？麻烦老师帮我看看

mybatisdemo.zip

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 28864楼

老师您好：

在讲解该插件使用时，<configurationFile>下有两个参数，第二个我猜出来了，第一个参数设置成true，

找资料没有找到，请问这个参数是什么意思？（如下）

微服务/第二阶段：项目管理和Linux/（旧）Maven 28865楼

老师帮忙看下哪里出错

log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

org.apache.ibatis.exceptions.PersistenceException:

### Error querying database. Cause: java.lang.NullPointerException

### The error may exist in com/bjsxt/mapper/UsersMapper.xml

### The error may involve com.bjsxt.mapper.UsersMapper.selectByPrimaryKey

### The error occurred while executing a query

### Cause: java.lang.NullPointerException

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:76)

at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:87)

at org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:152)

at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85)

at com.sun.proxy.$Proxy4.selectByPrimaryKey(Unknown Source)

at com.bjsxt.service.impl.UsersServiceImpl.selectUsersById(UsersServiceImpl.java:17)

at com.bjsxt.test.TestSelect.selectUsersById(TestSelect.java:16)

at com.bjsxt.test.TestSelect.main(TestSelect.java:10)

Caused by: java.lang.NullPointerException

at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)

at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:964)

at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.initializeDriver(UnpooledDataSource.java:230)

at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:223)

at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:219)

at org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:95)

at org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:432)

at org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:89)

at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:139)

at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:61)

at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:337)

at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:86)

at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)

at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325)

at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)

at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)

at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:89)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)

... 9 more

null

mybatisdemo5_Generator.rar

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 28866楼

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

<span>这是span标签</span>

<script>

var span=document.querySelector('span');
    //第一种
    var sp=span.ownerDocument;
    console.log(sp===document);//true
    console.log(sp.nodeName);//#document

    //第二种
    var span=document.getElementsByTagName('span');
    var sp=span.ownerDocument;
    console.log(sp===document);
    console.log(sp.nodeName);

</script>


</body>
</html>

老师您好为什么第二种方法得不到true 和#document呢？只是获取元素的方法不同。

WEB前端全系列/第二阶段：JavaScript编程模块/DOM模型 28867楼

老师好，错误提示。Error:(15, 26) java: java.time.Clock是抽象的; 无法实例化

pro.PNG

是因为JDK版本的过吗，我安装的JDK14

JAVA 全系列/第二阶段：JAVA 基础深化和提高/多线程和并发编程（旧） 28868楼

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/ibatis/io/Resources

at com.bjsxt.dao.impl.UsersDaoImpl.selectUsersAll(UsersDaoImpl.java:22)

at com.bjsxt.test.Test.main(Test.java:13)

Caused by: java.lang.ClassNotFoundException: org.apache.ibatis.io.Resources

at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)

at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)

at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)

... 2 more

Process finished with exit code 1

包导全了

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 28869楼

老师帮忙看下哪里出错

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/ibatis/io/Resources

at com.bjsxt.dao.impl.UsersDaoImpl.selectUsersAll(UsersDaoImpl.java:22)

at com.bjsxt.test.Test.main(Test.java:13)

Caused by: java.lang.ClassNotFoundException: org.apache.ibatis.io.Resources

at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)

at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)

at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)

... 2 more

Process finished with exit code 1

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 28870楼

登录不上去了

flask_shop2.zip

vue_shop1.zip

Python 全系列/第十阶段：Flask百战电商后台项目/Flask百战电商后台项目 28871楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>
        跨域传输
    </button>
    <script>
var but=document.querySelector('button');
but.onclick=function(){
    var iframe=document.createElement('iframe');
    iframe.src='page.html';//加载页面
    iframe.style.display='none';
    document.body.appendChild(iframe);
}
window.onload=function(eve){
 var iframeWindowName=eve.target.contentWindow.name;
 eval(iframeWindowName);
 console.log(num);
}
    </script>
</body>
</html>

老师，为啥报错的 contentWindow.name和eval()是啥意思

WEB前端全系列/第二阶段：JavaScript编程模块/面向对象编程 28872楼

老师，按鼠标右键都没有run，我是通过IDEA顶部菜单栏里面的按钮跑起来的，运行结果如下

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 28873楼

老师这个first_name和last_name哪里相同了啊，为啥会返回空

JAVA 全系列/第三阶段：数据库编程/SQL 语言 28874楼

老师win10系统下，初始化的窗口为啥只有上面的边框，？？如下图

JAVA 全系列/第一阶段：JAVA 快速入门/飞机大战小项目训练 28875楼

同学您好