有效沟通问答-【官方】百战程序员_IT在线教育培训机构

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>js_名称解释_变量</title>
</head>
<body>
<!-- script标签表示脚本，可在标签中写js代码。也可通过src属性引入外部脚本文件，注意：可以写在html的任意位置，但一般写在body的最后。1.语句，描述：以分号结尾的表达式。2.变量，描述：表示可以发生改变的量，语法：变量一般采用var来声明，举例var num=10； -->
    <script>


        var a=prompt("请输入您的成绩：");
        if(a>60){
            document.write("第五名！");
        }else if(a>70){
            document.write("第四名！");
        }else if(a>80){
            document.write("第三名！");
        }else if(a>90){
            document.write("第二名！");
        }else if(a=100){
            document.write("第一名！");
        }else{
            document.write("不及格！");
        }
    </script>
</body>
</html>

WEB前端全系列/第二阶段：JavaScript编程模块/运算符_数据类型和流程循环语句 28712楼

视频中一会是/，一会是/*；这两个有区别么？

<url-patten>/</url-patten >

JAVA 全系列/第六阶段：项目管理与SSM框架/SpringMVC 28713楼

老师，我这个红线怎么解决？users news都可以正常访问，是不是pycharm哪里没有配置好？

Python 全系列/第八阶段：轻量级Web开发利器-Flask框架/Flask视图高级 28714楼

老师，直方图和核密度图的使用场景有什么区别？

Python 全系列/第十九阶段：数据分析-数据管理/数据分析案例_案例1_足球运动员分析 28715楼

一、代码

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			var a=1;
			var b=1.2;
			var c='你好'
			var d=new Data();
			var e=true;
			alert(typeof a)
		</script>
		
	</head>
	<body>
		
		
	</body>
</html>
<!--
	
-->

二、老师请问，我这一行代码运行为啥没有反应？

Python 全系列/第七阶段：网页编程基础/JavaScript 28716楼

老师您好，跟您的请求数据库project数据的商品查询接口代码操作步骤编写好后，在浏览器页面显示的格式如下图所示：

并非您视频中页面得到数据的形式，同时控制传警告：

“资源被解释为文档，但使用 MIME 类型 application/json 进行了传输:”

而我在F12的网络那里的预览才看到规整的对象数据返回形式，请问这是什么方面出了问题，如何解决：

PS：商品查询接口代码如下：

const express = require('express');
const router = express.Router();
const SQLConnection = require('./SQLConnection');
const jwt = require('jsonwebtoken');
const config = require('./config');
const url = require('url')
router.get("/backend/item/selectTbItemAllByPage",(req,res)=>{
    const page =url.parse(req.url,true).query.page||1;
    const sql = "select * from egoproject order by id desc limit 10 offset " +(page-1)*10;
    SQLConnection(sql,null,result=>{
        if(result.length>0){
           res.send({
            status:200,
            data:{
                result
           })
        }else{
            res.send({
            status:500,
            msg:'暂无数据'
            })
        }
    })

})
module.exports= router;

WEB前端全系列/第二十阶段：Vue2企业级项目（旧）/Ego商城高级Vue实战项目 28717楼

老师，视频里的老师是按照String类型存入Redis的，应该只有一个key，那这个文件夹是怎么来的，我在源码里也没看到有创建文件夹的代码啊，案例说这种两个key的不是对应的hash类型的吗

JAVA 全系列/第十三阶段：高性能数据处理、NoSQL、分库分表/Redis 28718楼

老师，我这运行项目时，出现了这个问题，全部重来了三遍，网上的帖子也试了（坐标，依赖，和老师环境都一致），还是出现这个问题，卡了一天了，咋回事啊？

这里是源码

dubbo_parent.zip

Could not transfer metadata com.bjsxt:user_provider:1.0-SNAPSHOT/maven-metadata.xml from/to public

Transfer failed for http://192.168.0.199:8181/nexus/content/groups/public/com/bjsxt/user_provider/1.0-SNAPSHOT/maven-metadata.xml

JAVA 全系列/第十一阶段：分布式RPC调用和分布式文件存储/Dubbo 28719楼

老师你好,请问一下这怎么处理呢?导的包都是按照老师给的来的

JAVA 全系列/第二阶段：JAVA 基础深化和提高/IO 流技术（旧） 28720楼

package com.bjsxt.ObjectLiu;

import java.io.*;

public class TestStudent {
    public static void main(String[] args) {
          //write();//调用写对象的方法
        read();//调用读对象的方法
    }
    public static void write(){
        ObjectOutputStream oos= null;
        try {
            //oos = null;
            oos=new ObjectOutputStream(new FileOutputStream("E:\\student.txt"));
            Student stu=new Student("marry",20,"888888");
            Student.schoolName="JN校区";
            oos.writeObject(stu);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            //关闭
            if (oos!=null){
                try {
                    oos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
    public static void read(){
        ObjectInputStream ois= null;
        try {
            ois = null;
            ois=new ObjectInputStream(new FileInputStream("E:\\student.txt"));
            Student stu = (Student) ois.readObject();
            System.out.println(stu);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }finally {
            //关闭流
            if(ois!=null){
                try {
                    ois.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }
}
//打印结果：Student{name='marry', age=20, pwd='null'}schoolName=null
//杜老师，为什么我的打印结果含有单引号，而讲课的老师的打印结果是没有单引号的，麻烦您帮忙看一下，谢谢您

JAVA 全系列/第二阶段：JAVA 基础深化和提高/IO 流技术（旧） 28721楼

这部分的源码分析，应该是说的这个节点的头地址和尾地址以及中间的值，老师讲的一会这个指向这个，我反正觉得听不懂

JAVA 全系列/第二阶段：JAVA 基础深化和提高/容器（旧） 28722楼

//修改
obj.name='张先生';
obj['height']='170cm';
console.log(obj);

这两个obj，修改方式什么时候是

obj.name='张先生'

什么时候是

obj['height']='170cm';

WEB前端全系列/第二阶段：JavaScript编程模块/函数与对象 28723楼

如何复制，粘贴代码过来保持格式不变。我从pdf里面粘贴代码都是要自己缩进的，并不会和pdf一样

Python 全系列/第一阶段：Python入门/控制语句 28724楼

老师你好!

麻烦你看看这是什么问题？

uwsgi.log文件：

*** Starting uWSGI 2.0.18 (64bit) on [Sun Oct 18 18:01:18 2020] ***

compiled with version: 4.8.5 20150623 (Red Hat 4.8.5-39) on 18 October 2020 07:20:44

os: Linux-3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020

nodename: localhost.localdomain

machine: x86_64

clock source: unix

pcre jit disabled

detected number of CPU cores: 1

current working directory: /pythoncodes/script

writing pidfile to /pythoncodes/script/uwsgi.pid

detected binary path: /pythoncodes/py3env/bin/uwsgi

*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***

chdir() to /pythoncodes/netshop/

your processes number limit is 3795

your memory page size is 4096 bytes

detected max file descriptor number: 1024

!!! no /etc/mime.types file found !!!

lock engine: pthread robust mutexes

thunder lock: enabled

uWSGI http bound on 0.0.0.0:8000 fd 3

uwsgi socket 0 bound to UNIX address /pythoncodes/script/uwsgi.sock fd 6

*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***

Python version: 3.8.2 (default, Oct 18 2020, 12:37:31) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]

PEP 405 virtualenv detected: /pythoncodes/py3env/

Set PythonHome to /pythoncodes/py3env/

Python main interpreter initialized at 0x1d5aca0

*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***

python threads support enabled

your server socket listen backlog is limited to 100 connections

your mercy for graceful operations on workers is 60 seconds

mapped 486672 bytes (475 KB) for 5 cores

*** Operational MODE: preforking ***

Traceback (most recent call last):

File "/pythoncodes/py3env/lib/python3.8/site-packages/MySQLdb/__init__.py", line 18, in <module>

from . import _mysql

ImportError: libmysqlclient.so.18: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "./netshop/wsgi.py", line 16, in <module>

application = get_wsgi_application()

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application

django.setup(set_prefix=False)

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/__init__.py", line 24, in setup

apps.populate(settings.INSTALLED_APPS)

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/apps/registry.py", line 114, in populate

app_config.import_models()

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/apps/config.py", line 211, in import_models

self.models_module = import_module(models_module_name)

File "/usr/local/python38/lib/python3.8/importlib/__init__.py", line 127, in import_module

return _bootstrap._gcd_import(name[level:], package, level)

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/contrib/auth/models.py", line 2, in <module>

from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/contrib/auth/base_user.py", line 47, in <module>

class AbstractBaseUser(models.Model):

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/db/models/base.py", line 117, in __new__

new_class.add_to_class('_meta', Options(meta, app_label))

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/db/models/base.py", line 321, in add_to_class

value.contribute_to_class(cls, name)

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/db/models/options.py", line 204, in contribute_to_class

self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/db/__init__.py", line 28, in __getattr__

return getattr(connections[DEFAULT_DB_ALIAS], item)

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/db/utils.py", line 201, in __getitem__

backend = load_backend(db['ENGINE'])

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/db/utils.py", line 110, in load_backend

return import_module('%s.base' % backend_name)

File "/usr/local/python38/lib/python3.8/importlib/__init__.py", line 127, in import_module

return _bootstrap._gcd_import(name[level:], package, level)

File "/pythoncodes/py3env/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 15, in <module>

import MySQLdb as Database

File "/pythoncodes/py3env/lib/python3.8/site-packages/MySQLdb/__init__.py", line 24, in <module>

version_info, _mysql.version_info, _mysql.__file__

NameError: name '_mysql' is not defined

unable to load app 0 (mountpoint='') (callable not found or import error)

*** no app loaded. going in full dynamic mode ***

*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***

*** uWSGI is running in multiple interpreter mode ***

spawned uWSGI master process (pid: 4079)

spawned uWSGI worker 1 (pid: 4081, cores: 1)

spawned uWSGI worker 2 (pid: 4082, cores: 1)

spawned uWSGI worker 3 (pid: 4083, cores: 1)

spawned uWSGI worker 4 (pid: 4084, cores: 1)

spawned uWSGI worker 5 (pid: 4085, cores: 1)

spawned uWSGI http 1 (pid: 4086)

--- no python application found, check your startup logs for errors ---

[pid: 4082|app: -1|req: -1/1] 192.168.126.1 () {38 vars in 737 bytes} [Sun Oct 18 10:10:11 2020] GET /admin => generated 21 bytes in 0 msecs (HTTP/1.1 500) 2 headers in 83 bytes (0 switches on core 0)

--- no python application found, check your startup logs for errors ---

[pid: 4083|app: -1|req: -1/2] 192.168.126.1 () {40 vars in 700 bytes} [Sun Oct 18 10:10:11 2020] GET /favicon.ico => generated 21 bytes in 0 msecs (HTTP/1.1 500) 2 headers in 83 bytes (0 switches on core 0)

--- no python application found, check your startup logs for errors ---

[pid: 4084|app: -1|req: -1/3] 192.168.126.1 () {38 vars in 737 bytes} [Sun Oct 18 10:10:11 2020] GET /admin => generated 21 bytes in 0 msecs (HTTP/1.1 500) 2 headers in 83 bytes (0 switches on core 0)

--- no python application found, check your startup logs for errors ---

[pid: 4081|app: -1|req: -1/4] 192.168.126.1 () {40 vars in 700 bytes} [Sun Oct 18 10:10:11 2020] GET /favicon.ico => generated 21 bytes in 0 msecs (HTTP/1.1 500) 2 headers in 83 bytes (0 switches on core 0)

Python 全系列/下架-第十二阶段：Python_大型电商项目（5天后下架）/Django项目阶段-电商项目（旧） 28725楼

同学您好