Web从入门到放弃<1>

2022-09-21 22:20:40

HTML大法:

<01>

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>HoudiniVFX</title>

</head>

<body>

<h1>第一个标题</h1>

<h2>第二个标题</h2>

<h3>第三个标题</h3>

<p>段落test</p>

<p>段落是由p开始的</p>

</body>

</html>

Web从入门到放弃<1>

<02>style基础和跳转

<!DOCTYPE html>

<html lang="en">

<!-- this header define -->

<head>

    <meta charset="UTF-8">

    <title>a02</title>

</head>

<!-- this is horizon line-->

<hr/>

<body bgcolor="#a0522d">

<h1 align="center">Web Page by gearslogy</h1>

<p align="center"> Click paragraph will jump 163.com </p>

<a href="http://www.163.com">

    <p align="center">this is hyper link</p>

</a>

<!-- this is horizon line-->

<hr/>

</body>

</html>

Web从入门到放弃<1>

<03>文本换行

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>HTML change new line</title>

</head>

<body>

<!-- "this is new horizon line" -->

<hr/>

<!-- use <br/>  to change new line-->

<p align="center">this is<br/> a paragraph </p>

</body>

</html>

Web从入门到放弃<1>

<04>style基础,字体，对齐,颜色

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>StyleTest</title>

</head>

<body style="background-color: chocolate">

<h1 style="background-color: aliceblue;text-align: center">主题1</h1>

<p style="background: white">段落1</p>

<p style="font-family:Consolas"> this use Consolas font format</p>

<p style="font-family:Meiryo UI;color: blanchedalmond;font-size:20px;text-align: center">this use MeiryoUI font format</p>

</body>

</html>

Web从入门到放弃<1>

<05> <pre></pre> , <b></b>

傻逼转义符:

< 是&lt

>是&gt

&是&amp

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>TextFormat</title>

</head>

<body style="background-color: darkgray">

<h1 style="text-align: center;font-family: Consolas;"> <b>C++/Python Loop</b> </h1>

<hr/>

<!-- Introduce Header-->

<pre style="background-color: gray;

color: darkorange;border-bottom-width: 1px;

border-radius: 10px;

border-bottom-color: blue;

border-bottom-style:double;

font-family:Consolas;

font-size: 20px;">

<b>Introduce what's the loop

C++/Python</b>

</pre>

<!-- two blank lines-->

<br/>

<!-- Python Content-->

<pre style="background-color: wheat;color:black;

border-bottom-style: double;border-bottom-width: 1px;

border-bottom-color: darkorange;font-family: Consolas;

border-radius: 10px;">

<strong># A simple python code that represent how to use xrange:</strong>

<i>for x in xrange(0,100):

    if x is 10:

        continue

    print x</i>

</pre>

<!-- C++ Content-->

<pre style="background-color: wheat;color:black;

border-bottom-style: double;border-bottom-width: 1px;

border-bottom-color: darkorange;

font-family: Consolas;

border-radius: 10px;">

<strong># A C++ code that represent how to use foreach:</strong>

<i>std::for_each(values.begin(),values.end(),Function)</i>

<i>for(auto &amp v; values)

{

    std::cout &lt&lt v &lt&lt std::endl;

}

</i>

</pre>

<p style="text-align: center"> Keyword: &lth1&gt , &ltpre&gt </p>

</body>

</html>

Web从入门到放弃<1>

========================== ========================== 分界线 必须牛逼 ========================== ========================== ========================== ==========================

Django:

django/flask 选那个，网络上各有各的说法，先搞搞重重的django

<1>BASIC:

django-admin startproject mysite 开始工程

python manage.py runserver 开启服务

python manage.py runserver 8080 指定8080端口

python manage.py startapp polls 创建一个polls app

Web从入门到放弃<1>

修改polls/views :

# -*- coding: utf-8 -*-

from __future__ import unicode_literals

from django.shortcuts import render

from django.http import HttpResponse

def index(request):

    return HttpResponse("<b>Hello this is poll index.<b/>")

# Create your views here.

修改polls/urls.py 没有这个文件可以新建:

from django.conf.urls import url, include

from . import views

urlpatterns = [

    url('', views.index, name='index'),

]

修改mysite里面的urls.py,这里面我设置了127.0.0.1:8000 和 127.0.0.1:8000/polls都指向 polls里的app的url

from django.conf.urls import url, include

from django.contrib import admin

urlpatterns = [

    url(r'^admin/', admin.site.urls),

    url(r'^polls/', include('polls.urls')),

    url(r'^', include('polls.urls'))  # main

]

 所以结果:127.0.0.1:8000

Web从入门到放弃<1>

 所以结果:127.0.0.1:8000/polls

Web从入门到放弃<1>

遇到的问题:django官网是这样写:

Web从入门到放弃<1>

更新Model:

python manage.py makemigrations polls 生成polls数据库

python manage.py sqlmigrate polls 0001  查看数据库代码创建

python manage.py migrate   提交到数据库中

python manage.py shell

python manage.py createsuperuser  创建超级用户

交互式python manage.py shell

控制数据库

>>from polls.models import Question,Choice

>>Question.objects.all() #列出数据库，但是展示以Python 形式展示!

>>from django.utils import timezone

>>q = Question(question_text="What's new?", pub_date=timezone.now())

>>q.save()  #直接保存到 数据库中

>>q.id #列出当前的ID

>>q.question_text = "What's up?"

>>q.save()

退出交互式:如果想再次更改这个"What's up的呢？"

添加__str__方法，让返回的类对象能看到类代表的数据库

Web从入门到放弃<1>

# 这里更改了第二个数据，因为暂时没处理中文:

Web从入门到放弃<1>

要在admin显示数据库:首先在每个app中的admin.py 写入

from .models import Question
admin.site.register(Question)

admin后台显示:

Web从入门到放弃<1>

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

urlpatterns的设计:

我现在用的1.11版本。然后发现了并不支持django2.0传参方法:

现在要做这样的事情:

<1>http://127.0.0.1:8000/polls/

<2>http://127.0.0.1:8000/polls/1/

<3>http://127.0.0.1:8000/polls/4/results/

<4>http://127.0.0.1:8000/polls/4/vote/

其中

<1>已经被我们定义好了,在polls/views.py添加了

from django.http import HttpResponse

def index(request):

    return HttpResponse("Hello this is poll index.")

然后在polls/urls.py里

urlpatterns = [

    #/polls/

    url(r'', views.index, name='index')]

那么这个设计其实是有问题，至少在当前的django1.11问题。

比如我现在输入http://127.0.0.1:8000/polls/ ,没问题。网页显示:

Web从入门到放弃<1>

问题来了:

http://127.0.0.1:8000/polls/1     也是这样子.

http://127.0.0.1:8000/polls/1/1   也是这样子.

http://127.0.0.1:8000/polls/1/vote   也是这样子.

解决方法 主要是正则的概念:修改polls/urls.py:

urlpatterns = [

    #/polls/

    url(r'^$', views.index, name='index'),]

其他的解决用全部代码说明:

/polls/views.py

from django.shortcuts import render

from django.http import HttpResponse

def index(request):

    return HttpResponse("Hello this is poll index.")

#/polls/1

def detail(request, question_id):

    return HttpResponse("You're looking at question %s." % question_id)

#/polls/1/results/

def results(request, question_id):

    response = "You're looking at the results of question %s."

    return HttpResponse(response % question_id)

#/polls/1/vote/

def vote(request, question_id):

    return HttpResponse("You're voting on question %s." % question_id)

/polls/urls.py

from django.conf.urls import url, include

from . import views

urlpatterns = [

    #/polls/

    url(r'^$', views.index, name='index'),

    #/polls/1

    #url(r'^(\d+)/$',views.detail,name='detail'),

    url(r'^([0-9]+)/$',views.detail,name='detail'),

    #/polls/1/results/

    url(r'^(\d+)/results/$',views.results,name='results'),

    #/polls/1/vote/

    url('^(\d+)/vote/$',views.vote,name='vote')

]

接下来实现整数数字相加(参考https://code.ziqiangxuetang.com/django/django-views-urls2.html):

Web从入门到放弃<1>

polls/views.py增加

#/polls/1/2/

def add(request,a,b):

    c = int(a) + int(b)

    return HttpResponse('<h1 style="background-color:darkgray;border-radius:10px;">The add result is %s.</h1>' % c)

polls/urls.py增加:

url(r'^([0-9]+)/([0-9]+)/$',views.add,name='add'),
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