Basic knowledge of web pages (URL related)

url form ： agreement // website / Virtual directory / file name # anchor

The partial ：http：//、https://( You do not need to enter... When entering the web address , Web pages will be automatically added ）

website ：www.baidu.com.

domain name ：baidu.com

Top-level domain name ： Institutions 、 Country

.com: business organization

.org: Non profit organizations

.gov： government organs

.edu: Educational and research institutions

.cn: China

.us： The United States

Two level domain name ： Branches and formula products sometimes use secondary domain names

Such as ：mail.qq.com

Static website ：

1. After the content is published on the website, it is saved on the website , The content of the document is fixed

2. The content is relatively stable and easy to search

3. No database support （ Heavy production and maintenance workload ）

4. Poor interactivity

Dynamic website ：

1. Interactivity , Web pages will dynamically change and respond to users' needs .

2. Auto update , Save work

3. Change with people , Different time , Different users have different access contents

  

The relationship between dynamic websites and static websites is mutually exclusive , Dynamic website to asp,jsp,php,perl,cgi In the form of , instead of html etc.

The basic concept of the website ：

The server ： Devices that provide computing services （server） Including documents 、 database 、 Applications ,web etc. , The function of the server depends on the service software installed on the computer ：Apache、tomcat、iis etc.

ip Domain name ：

ip The address is unique , The function of domain name is to replace ip Address

DNS（ The domain name system ）： And ip Domain name mapping , Resolving domain names makes it easier for users to find the Internet

port （port）： Virtual and physical ports

The outlet for communication between equipment and the outside world , The virtual port is inside the computer or inside the switch router , invisible

Physical ports are interfaces .

Access Process ：

User input ->DNS-> Server computer -> Virtual ports （ Server software ）

Static web address ：

Personal computer ： browser        （ Connected to the Internet ）       Server computer ： Apache, Folder ： Many web pages  

Input url                 dns（ Local ip      The Internet ip）  ：   The Internet ip To local computer      Find the server computer , adopt 80 Port find service software apache

 http//localhost:80/index.html Indicates the relative directory of the file ;                            apache Return the results to the browser , Browser parsing                                                                       

  Dynamic website ：

http://localhost:80/index.php

mysql database （ Command line operations ）

Access requires searching 、 matching 、 Connection authentication .

The host address ：-hlocalhost（ It saves ）

port ：-P3306（ It saves ）

authentication ： Enter the server through user name and password （ Don't omit ）

user name ：-uroot

password ：-proot

namely ：mysql -hlocalhost -P3306 -uroot -proot

Virtual host ：

Name the folders on your computer differently , Then the implementation allows the server to change from different folders according to the needs of users （ Website ） Read different contents in

classification ：

1、 be based on ip Virtual host of address , There are multiple on one computer ip, Every ip Corresponding to a website .

principle ： There is only one computer by default ip, Because there is usually only one network card ： But some computers （ Most servers ） You can configure multiple ip Address

2、 Domain based virtual host , There is only one computer ip, however IP You can create multiple websites , But give each site a different name （ Virtual host name ）