Asp function Introduction (i)

Function

Many functions in ASP, we should focus on learning functions: function name, function function, function return value and example.

1. Function Array ()
Function: Create a number of variables
Format: Array (list)
Parameters: The list is the number of columns in the variable, and the middle is separated by the funny numbers.
Example:
<% i = Array ("1", "2", 3)%>
Results: I was given to the numbers
2. Function CInt ()
Function: Convert one expression/other type of change into integer type (int)
Format: Cint (expression)
Parameters: expression is any valid expression/other type of variable
Example:
<%
F = "234"
Response.Write CINT (f) + 2
%>
Results: 236
The function CInt () transforms the character "234" into an integer of 234. If the expression is empty or ineffective, the return value is 0;
3. Function: Creatobject ()
Function: Create and return an ActiveX image.
Format: Creatobject (obname)
Parameters: Obname is the name of the image
Example:
<%
Set con = Server.CreateObject ("ADODB.") Connection ")
%>
Outcome:
4. Function CStr ()
Function: Convert one expression/other type of change to character type (string)
Format: Cstr (expression)
Parameters: expression is any valid expression/other type of variable
Example:
<%
s = 3 + 2
Response.Write "The result is:" & CStr (s)
%>
Results: the function CStr () transforms the integer 5 into the character "5".
5. Function date ()
Function: Returns the date of the previous system (server side)
Format: Date ()
Parameters: No
Example <% date ()%>
Outcome: 05/10/00
6. Function DateAdd ()
Function: Calculate a specified time and
Format: DateAdd (timeinterval,number,date)
Parameters: TimeInterval is a time unit (month, day ...); Number is the time interval, and date is the time to start.
Example:
<%
currentdate = #8/4/99#
Newdate = DateAdd ("M", 3,currentdate)
Response.Write Newdate
%> <%
currentdate = #12:34:45 pm#
Newdate = DATEADD ("h", 3,currentdate)
Response.Write Newdate
%>
Outcome:
11/4/99
3:34:45 PM
which
"M" = "month";
"D" = "Day";
If it's a currentdate format,
"H" = "Hour";
"S" = "second";
7. Function DateDiff ()
function: Calculate the time difference specified by a certain amount
Format: DateDiff (Timeinterval,date1,date2[,firstdayofweek[,firstdayofyear]])
Parameters: TimeInterval is a time unit; Date1,date2 is a valid date expression, and firstdayofweek,firstdayofyear is an arbitrary option.
Example:
<%
FromDate = #8/4/99#
ToDate = #1/1/2000#
Response.Write "There are" & _
DateDiff ("D", Fromdate,todate) & _
"Millenium from 8/4/99."
%>
Results: There are to millenium from 8/4/99.
8. Function Day ()
Function: Returns an integer value that corresponds to a certain date of the month
Format: Day (date)
Parameters: Date is a valid time-table expression;
Example lt;% =date (#8/4/99#)%>
Results: 4
9. Function FormatCurrency ()
Function: Convert into currency format
Format: formatcurrency (expression [, digit[,leadingdigit[,paren[,groupdigit]]]
Parameters: expression is a valid number expression; digit represents the digits after the decimal point; Leadingdigit,paren,groupdigit is any option.
Example <%=formatcurrency (34.3456)%>
Results 34.35
10. Function FormatDateTime ()
Features: Formatting dates Express/change
Format: FormatDateTime (Date[,nameformat])
Parameters: Date is a valid data expression/variable; NameFormat is the specified date format constant name.
Example <% =formatdatetime ("08/04/99", vbLongDate)%>
Outcome: Wednesday,august 04,1999
21. Function IsNumeric ()
Function: Returns a Boolean value, whether the variable is a number change, or can be converted to a number of other changes.
Format: isnumeric (expression)
Parameters: expression is any variable.
Example:
<%
i= "234"
Response.Write IsNumeric (i)
%>
Results: TRUE.
22. Function IsObject ()
Function: Returns a Boolean value, whether the variable is the change of the image,
Format: isobject (expression)
Parameters: expression is any variable.
Example:
<%
Set con =server.creatobject ("adodb.connection")
Response.Write IsObject (Con)
%>
Outcome: True
23. Function: Lbound ()
Function: Returns the lower bound of a group.
Format: Lbound (Arrayname[,dimension])
Parameters: Arrayname is a number of variables, dimension is any
Example:
<%
i = Array ("1", "2", "3")
Response.Write LBound (i)
%>
Results: 0