ASP depth reveal (on)

First, the basic knowledge of ASP
1. ASP is the abbreviation for active Server pages and is an interpreted scripting locale;
2. The operation of the ASP requires Windows operating system, the installation of PWS is required under 9x, and NT/2000/XP needs to install Internet Information Server (IIS);
3. ASP and JSP script tag is "<%%>", PHP can be set to a variety of;
4. The annotation symbol for ASP is "'";
5. Using additional components, you can extend the functionality of the ASP.
Example:
Helloworld_1.asp
<%= "Hello,world"%>
Effect:
Hello,world
Helloworld_2.asp
<%
For I=1 to 10
Response.Write "Hello,world"
Next
%>
Effect:
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Hello,world
Note: ASP is case-insensitive; variables need not be defined or used, the conversion is convenient; the grammar check is very loose.
Second, the use of ASP built-in objects:
You can use any of the following ASP built-in objects without having to specifically declare them in ASP scripts.
1. Request:
Definition: Can be used to access the request information sent from the browser to the server, which is used to read information about the HTML form that has been entered.
Set:
Cookies: Contains the value of the browser cookies
Form: Contains values from HTML form fields
QueryString: A value containing a query string
ServerVariables: Contains the values in the header and environment variables
Example:
Request_url.asp
<%
' Get user input and save in variable
User_id=request.querystring ("user_id")
User_name=request.querystring ("user_name")
' Determine if user input is correct
If user_id= "" Then
Response.Write "USER_ID is null,please check it"
Response.End
End If
If User_name= "" Then
Response.Write "User_name is null,please check it"
Response.End
End If
' Print variable
Response.Write user_id& "<br>"
Response.Write User_name
%>
Effect:
When you access http://10.1.43.238/course/request_url.asp?user_name=j:
USER_ID is null,please check it
When you access http://10.1.43.238/course/request_url.asp?user_name=j&user_id=my_id:
my_id
J
Thinking: How are variables passed in URLs and retrieved by ASP pages?
Request_form.htm