ASP Function Introduction

1. Function Array ()

function: Create an array variable


format: Array (list)


parameter: List each numeric column in an array variable, with a comma interval between


Example:


<% i = Array ("1", "2", 3)%>


Result: I was given an array of


2. Function CInt ()


function: Converts an expression/other type of variable to an integer type (int)


format: Cint (expression)


parameter: expression is any valid expression/other type of variable


Example:


<%


f = "234"


Response.Write CINT (f) + 2


%>


Result: 236

The
function CInt () converts the character "234" to an integer 234. If the expression is empty or invalid, the return value is 0;


3. Function: Creatobject ()


function: Creates and returns an ActiveX object.


format: Creatobject (obname)


parameter: Obname is the name of the object


Example:


<%


Set con = Server.CreateObject ("ADODB.") Connection ")


%>


Results:


4. Function CStr ()


Function: Converts an expression/other type of variable to a character type (string)


format: Cstr (expression)


parameter: expression is any valid expression/other type of variable


Example:


<%


s = 3 + 2


Response.Write "The result is:" & CStr (s)


%>


Result: the function CStr () converts the integer 5 to the character "5".


5. Function date ()


function: Returns the date of the current system (server side)


format: Date ()


parameter: No


example <% date ()%>


results: 05/10/00


6. Function DateAdd ()


function: Calculates a specified time and


format: DateAdd (timeinterval,number,date)


parameter: TimeInterval is the time unit (month, day ...); Number is the time interval value, date is the point of origin.


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


%>


Results:


11/4/99


3:34:45 PM


which


"M" = "month";


"D" = "Day";


if it is a currentdate format, then


"H" = "Hour";


"S" = "second";


7. Function DateDiff ()


function: Calculates a specified time difference for a certain amount


format: DateDiff (Timeinterval,date1,date2[,firstdayofweek[,firstdayofyear])


parameter: TimeInterval is a time unit; Date1,date2 is a valid date expression, Firstdayofweek,firstdayofyear is any 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 day of the month


format: Day (date)


parameter: date is a valid datetime expression;


Example lt;% =date (#8/4/99#)%>


Result: 4


9. Function FormatCurrency ()


function: Convert to currency format


format: formatcurrency (expression [, Digit[,leadingdigit[,paren[,groupdigit]]])


parameter: expression is a valid numeric expression, digit represents the number of digits after the decimal point, and leadingdigit,paren,groupdigit is any option.


Example <%=formatcurrency (34.3456)%>


Results 34.35


10. Function FormatDateTime ()


function: Format date expression/variable


format: FormatDateTime (Date[,nameformat])


parameter: Date expression/variable is valid, NameFormat is the specified date format constant name.


Example <% =formatdatetime ("08/04/99", vblongdate)%>


results: Wednesday,august 04,1999


21. Function IsNumeric ()


function: Returns a Boolean value that determines whether a variable is a numeric variable or another variable that can be converted to a number.


format: isnumeric (expression)


parameter: expression is any variable.


Example:


<%


i= "234"


Response.Write IsNumeric (i)


%>


Result: true.


22. Function IsObject ()


function: Returns a Boolean value that determines whether a variable is an object,


format: isobject (expression)


parameter: expression is any variable.


Example:


<%


set con =server.creatobject ("adodb.connection")


Response.Write IsObject (Con)


%>


Result: True


23. Function: Lbound ()


function: Returns the lower bound of an array.


format: Lbound (Arrayname[,dimension])


parameter: arrayname is an array variable, dimension is any item


Example:


<%


i = Array ("1", "2", "3")


Response.Write LBound (i)


%>


Results: 0

24. Function LCase ()
Feature: Converts the character of a character type variable to all lowercase characters.
Format: Lcase (String)
parameter: string is a string variable
Example:
<%
str= "This is lcase!"
Response.Write Lcase (str)
%>
Results: This is lcase!
25. Function left ()
function: Intercepts the front part of a string;
Format: Left (string,length)
Parameter: string, length intercepted.
Example: <% =left ("This is a test!", 6)%>
Result: this I
26. Function len ()
Function: Returns the length of a string or the byte length of a variable
format: Len (string |varname
Parameter: string string; varname arbitrary variable name
Example:
<%
strtest= "This is a test!" &NBSP;