老师，为什么Home页面什么都没有显示的呢？

打断点运行报了个
No module named context_processor钩子
这是为啥呀，怎末解决这个（这节课，6分45秒左右）

salarys = []
sum = 0
for i in range(4):
    salary = input("请输入一共4名员工薪资(按Q或q中途结束):")
    if salary.upper()=='Q':
        print("录入结束，退出")
        break
    if float(salary)<0:
        continue
    sum+=float(salary)
    salarys.append(float(salary))
else:
    print("您已全部录入4名员工的薪资")

print("薪资明细:",salarys)
print("平均工资{0}".format(sum/4))

老师，我交的这个作业批改老师说sum/4,有问题，他说输入正确数据时是对的，其他都是错的，我不明白为什么，错在哪里了？

老师，我想问一下第一个是哪里错了

 function func(arr1){
     var max=arr1[0];
     var index=0;
     for(var i=0;i<arr1.length;i++){
         if(max<arr1[i]){
             max=arr1[i];
             index=i;
         }
     }

     return max;
     return index;
 }
var arr=[182,60,92,335];
console.log(func(arr));
老师我这程序不知道哪里出问题了，下标打印不出来

elc-box中最后一个盒子中 浏览更多 设置宽高不生效 字体图标大小也不生效（字体图标不显示这个问题也有疑问，）

           <!-- 家电部分 -->
            <div class="elc">
                <div class="elc-nav">
                    <a href="#">
                        <img src="../images/41d16e66381cfeda7b6b39ab67678d5e.jpg" alt="">  
                    </a>
                </div>     
                <h2 class="title">家电
                    <a href="#">
                        <span>热门</span>
                        <span>电视影音</span>
                    </a>
                </h2>
                <div class="elc-box">
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/116fc43816b87192be4e67cf762e8da5.jpeg" alt="">
                         </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/03a9e7e96a09d256ca1badeec186c859.jpg" alt=""  class="img1">
                                <h3 class="name2">小米全面屏电视65英寸 E65X </h3>
                                <p class="desc2">全面屏设计</p>
                                <p class="price2">2999元<del class="original">3299元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/20d36fbaa18625e4fe507af31e4e9f83.jpg" alt="" class="img1">
                            <h3 class="name2">全面屏电视E43K  </h3>
                            <p class="desc2">全面屏设计，海量内容</p>
                            <p class="price2">1349元<del class="original">1500元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/9d8674cd21c486feff5328772ab9cf01.jpg" alt="" class="img1">
                            <h3 class="name2">小小米电视4A 70英寸 </h3>
                            <p class="desc2">大屏更享受</p>
                            <p class="price2">3599元<del class="original">3900元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/6bed167fc905bab57dee478bcf1e5e0d.JPG" alt="" class="img1">
                            <h3 class="name2">米家互联网对开门冰箱 540L </h3>
                            <p class="desc2">重磅新品福利特惠</p>
                            <p class="price2">2999元<del class="original">3600元</del></p>
                        </a>
                    </div>
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/dfbdabe36b2d630d57a015e6fb5eb3ea.jpg" alt="">
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/b8c63a2024528fe5410ebe669b7d2407.jpg" alt="" class="img1">
                            <h3 class="name2">Redmi全自动波轮洗衣机1A 8kg</h3>
                            <p class="desc2">一键操作，父母都爱用</p>
                            <p class="price2">849元<del class="original">899元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/74e573c4c0d89048392d14831cc507d5.jpg" alt="" class="img1">
                            <h3 class="name2">Air 13.3" 2019款 </h3>
                            <p class="desc2">新一代独立显卡</p>
                            <p class="price2">6299元</p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/7e5f89adf98ab3fccb34012b5209cd58.jpg" alt="" class="img1">
                            <h3 class="name2">米家互联网烟灶套装（天然气）</h3>
                            <p class="desc2">点火排烟，风随火动</p>
                            <p class="price2">2298元</p>
                        </a>
                    </div>
                    <div class="items-last">
                        <div>
                            <a href="#">
                                <img src="../images/1612c93ad4756215774a0dbec7a81bb2.jpg" alt="">
                                <h3 class="name2">米家电烤箱 </h3>
                                <p class="price2">279元</p>
                            </a>
                        </div>
                        <div>
                            <a href="#">
                                <div class="more">浏览更多
                                    <small>电视影音</small>
                                </div>
                                <i class="icontfont">&#xe619;</i>
                            </a>
                        </div>
                    </div>
                </div>
            </div>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>小米广告部分</title>
    <link rel="icon" href="../images/favicon.ico">
    <link rel="stylesheet" href="../css/reset.css">
    <!-- <link rel="stylesheet" href="../css/demo.css "> -->
    <link rel="stylesheet" href="小米.css">
</head>
<body>
 <div class="content">
        <div class="wrap">
           <!-- 家电部分 -->
            <div class="elc">
                <div class="elc-nav">
                    <a href="#">
                        <img src="../images/41d16e66381cfeda7b6b39ab67678d5e.jpg" alt="">  
                    </a>
                </div>     
                <h2 class="title">家电
                    <a href="#">
                        <span>热门</span>
                        <span>电视影音</span>
                    </a>
                </h2>
                <div class="elc-box">
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/116fc43816b87192be4e67cf762e8da5.jpeg" alt="">
                         </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/03a9e7e96a09d256ca1badeec186c859.jpg" alt=""  class="img1">
                                <h3 class="name2">小米全面屏电视65英寸 E65X </h3>
                                <p class="desc2">全面屏设计</p>
                                <p class="price2">2999元<del class="original">3299元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/20d36fbaa18625e4fe507af31e4e9f83.jpg" alt="" class="img1">
                            <h3 class="name2">全面屏电视E43K  </h3>
                            <p class="desc2">全面屏设计，海量内容</p>
                            <p class="price2">1349元<del class="original">1500元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/9d8674cd21c486feff5328772ab9cf01.jpg" alt="" class="img1">
                            <h3 class="name2">小小米电视4A 70英寸 </h3>
                            <p class="desc2">大屏更享受</p>
                            <p class="price2">3599元<del class="original">3900元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/6bed167fc905bab57dee478bcf1e5e0d.JPG" alt="" class="img1">
                            <h3 class="name2">米家互联网对开门冰箱 540L </h3>
                            <p class="desc2">重磅新品福利特惠</p>
                            <p class="price2">2999元<del class="original">3600元</del></p>
                        </a>
                    </div>
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/dfbdabe36b2d630d57a015e6fb5eb3ea.jpg" alt="">
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/b8c63a2024528fe5410ebe669b7d2407.jpg" alt="" class="img1">
                            <h3 class="name2">Redmi全自动波轮洗衣机1A 8kg</h3>
                            <p class="desc2">一键操作，父母都爱用</p>
                            <p class="price2">849元<del class="original">899元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/74e573c4c0d89048392d14831cc507d5.jpg" alt="" class="img1">
                            <h3 class="name2">Air 13.3" 2019款 </h3>
                            <p class="desc2">新一代独立显卡</p>
                            <p class="price2">6299元</p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/7e5f89adf98ab3fccb34012b5209cd58.jpg" alt="" class="img1">
                            <h3 class="name2">米家互联网烟灶套装（天然气）</h3>
                            <p class="desc2">点火排烟，风随火动</p>
                            <p class="price2">2298元</p>
                        </a>
                    </div>
                    <div class="items-last">
                        <div>
                            <a href="#">
                                <img src="../images/1612c93ad4756215774a0dbec7a81bb2.jpg" alt="">
                                <h3 class="name2">米家电烤箱 </h3>
                                <p class="price2">279元</p>
                            </a>
                        </div>
                        <div>
                            <a href="#">
                                <div class="more">浏览更多
                                    <small>电视影音</small>
                                </div>
                                <i class="icontfont">&#xe619;</i>
                            </a>
                        </div>
                    </div>
                </div>
            </div>
         </div>
    </div>

这个version什么时候需要指定？可以是哪些值

为什么要封装集合时在他们前加那个注解

from urllib.request import Request,build_opener

from fake_useragent import UserAgent

from urllib.parse import urlencode

from urllib.request import HTTPCookieProcessor

login_url = 'https://www.bilibili.com/page-proxy/game-nav.html'

form_data = {

    "user":"15212123250",

    "password":"2742558764"

}

headers = {

    "User-Agent":UserAgent().random,

}

req = Request(login_url, headers=headers, data=urlencode(form_data))

handler = HTTPCookieProcessor()

opener = build_opener(handler)

resp = opener.open(req)

info_url = "https://www.bilibili.com/"

req = Request(info_url, headers=headers)

resp = opener.open(req)

print(resp.read().decode())

老师：

     下午好！我改为vue-cli.3.011后，可以跑起来了，前后台通行，但在cmd运行中出现以下截图中的现像“[nodemon] app crashed - waiting for file changes before starting...”，怎样处理呢？谢谢！

D:\project zl\egoshop\egoshop>npm run dev

> egoshop@0.1.0 dev D:\project zl\egoshop\egoshop

> concurrently "npm run serve" "nodemon mock/index.js"

[1] [nodemon] 2.0.7

[1] [nodemon] to restart at any time, enter `rs`

[1] [nodemon] watching path(s): *.*

[1] [nodemon] watching extensions: js,mjs,json

[1] [nodemon] starting `node mock/index.js`

[1] events.js:287

[1]       throw er; // Unhandled 'error' event

[1]       ^

[1]

[1] Error: listen EADDRINUSE: address already in use :::3002

[1]     at Server.setupListenHandle [as _listen2] (net.js:1313:16)

[1]     at listenInCluster (net.js:1361:12)

[1]     at Server.listen (net.js:1449:7)

[1]     at Function.listen (D:\project zl\egoshop\egoshop\node_modules\_express@4.17.1@express\lib\application.js:618:24)

[1]     at Object.<anonymous> (D:\project zl\egoshop\egoshop\mock\index.js:27:5)

[1]     at Module._compile (internal/modules/cjs/loader.js:1133:30)

[1]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)

[1]     at Module.load (internal/modules/cjs/loader.js:977:32)

[1]     at Function.Module._load (internal/modules/cjs/loader.js:877:14)

[1]     at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)

[1] Emitted 'error' event on Server instance at:

[1]     at emitErrorNT (net.js:1340:8)

[1]     at processTicksAndRejections (internal/process/task_queues.js:84:21) {

[1]   code: 'EADDRINUSE',

[1]   errno: 'EADDRINUSE',

[1]   syscall: 'listen',

[1]   address: '::',

[1]   port: 3002

[1] }

[1] [nodemon] app crashed - waiting for file changes before starting...

老师，我在使用多线程爬取文件的时候，会出现文件写入不全，然后我在写入文件的的时候加入锁，但是发现还写入不全，您帮我看一下！

from threading import Thread,Lock
import requests
from lxml import etree
from fake_useragent import UserAgent
from queue import Queue
class Spider(Thread):
    def __init__(self,url_queue,lock):
        Thread.__init__(self)
        self.url_queue = url_queue
        self.lock = lock

    def run(self):
        while not self.url_queue.empty():
            url = self.url_queue.get()
            print(url)
            headers = {'User-Agent':UserAgent().chrome}
            resp = requests.get(url,headers=headers)
            e = etree.HTML(resp.text)
            contents = [div.xpath('string(.)').strip() for div in e.xpath('//div[@class="content"]')]
            #加入锁
            self.lock.acquire()
            with open('qiushi.text', 'a', encoding='utf-8')as f:
                for content in contents:
                    f.write(content+'\n')
            self.lock.release()
if __name__ == '__main__':
    base_url = 'https://www.qiushibaike.com/text/page/{}/'
    lock = Lock()
    url_queue = Queue()
    for num in range(1,14):
        url_queue.put(base_url.format(num))
    for i in range(6):
        spider = Spider(url_queue,lock)
        spider.start()

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #container {
            display: grid;
            grid-template-columns: 200px 200px 200px;
            grid-template-rows: 200px 200px 200px 200px 200px 200px;
            grid-template-areas: "item1 item1 item2"
                                 "item1 item1 item3"
                                 "item3 item3 item3"
                                 "item4 item5 item6"
                                 "item7 item8 item9"
                                 "item9 item9 item9";
        }

        .item{
            font-size: 30px;
            border: 1px solid #e5e4e9;
            text-align: center;
            line-height: 200px;
        }

        .item-1 {
            grid-area: item1;
            background-color: #ef342a;
        }

        .item-2 {
            grid-area: item2;
            background-color: #f68f26;
        }

        .item-3 {
            grid-area: item3;
            background-color: #4ba946;
        }

        .item-4 {
            grid-area: item4;
            background-color: #0376c2;
        }

        .item-5 {
            grid-area: item5;
            background-color: #c077af;
        }

        .item-6 {
            grid-area: item6;
            background-color: #f8d29d;
        }

        .item-7 {
            grid-area: item7;
            background-color: #b5a87f;
        }

        .item-8 {
            grid-area: item8;
            background-color: #d0e4a9;
        }

        .item-9 {
            grid-area: item9;
            background-color: #4dc7ec;
        }
    </style>
</head>

<body>
    <div id="container">
        <div class="item item-1">1</div>
        <div class="item item-2">2</div>
        <div class="item item-3">3</div>
        <div class="item item-4">4</div>
        <div class="item item-5">5</div>
        <div class="item item-6">6</div>
        <div class="item item-7">7</div>
        <div class="item item-8">8</div>
        <div class="item item-9">9</div>
    </div>
</body>

</html>

为什么我的代码运行出来效果不对

页面中原有的标签不能通过style方法进行js修改属性吗

三大框架整合的配置文件是要记住的吗？以后工作也是自己写吗？

class Student extends person{
    String major;

    public void study(){
        System.out.println("学习");
        rest();
        System.out.println(this.name);
    }
}

这里的this.name是指在这个子类中创建的名字吗