asp 常用函数用法

Array() 
   FUNCTION: 返回一个数组 
   SYNTAX: Array(list) 
   ARGUMENTS: 字符,数字均可 
   EXAMPLE: <% 
Dim myArray() 
For i = 1 to 7 
Redim Preserve myArray(i) 
myArray(i) = WeekdayName(i) 
Next 
%> 

   RESULT: 建立了一个包含7个元素的数组myArray 
   myArray("Sunday","Monday", ... ... "Saturday") 

CInt() 
   FUNCTION: 将一个表达式转化为数字类型 
   SYNTAX: CInt(expression) 
   ARGUMENTS: 任何有效的字符均可 
   EXAMPLE: <% 
f = "234" 
response.write cINT(f) + 2 
%> 

   RESULT: 236 
   转化字符"234"为数字"234",如果字符串为空,则返回0值 

CreateObject() 
   FUNCTION: 建立和返回一个已注册的ACTIVEX组件的实例。 
   SYNTAX: CreateObject(objName) 
   ARGUMENTS: objName 是任何一个有效、已注册的ACTIVEX组件的名字. 
   EXAMPLE: <% 
Set con = Server.CreateObject("ADODB.Connection") 
%> 

   RESULT: 

CStr() 
   FUNCTION: 转化一个表达式为字符串. 
   SYNTAX: CStr(expression) 
   ARGUMENTS: expression 是任何有效的表达式。 
   EXAMPLE: <% 
s = 3 + 2 
response.write "The result is: " & cStr(s) 
%> 

   RESULT: 转化数字“5”为字符“5”。 

Date() 
   FUNCTION: 返回当前系统日期. 
   SYNTAX: Date() 
   ARGUMENTS: None. 
   EXAMPLE: <%=Date%> 
   RESULT: 8/4/99 

DateAdd() 
   FUNCTION: 返回一个被改变了的日期。 
   SYNTAX: DateAdd(timeinterval,number,date) 
   ARGUMENTS: timeinterval is the time interval to add; number is amount of time intervals to add; and date is the starting date. 
   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 
%> 

   RESULT: 11/4/99 
   3:34:45 PM 

   "m" = "month"; 
   "d" = "day"; 

   If currentDate is in time format then, 
   "h" = "hour"; 
   "s" = "second"; 

DateDiff() 
   FUNCTION: 返回两个日期之间的差值 。 
   SYNTAX: DateDiff(timeinterval,date1,date2 [, firstdayofweek [, firstweekofyear>>) 
   ARGUMENTS: timeinterval 表示相隔时间的类型,如“M“表示“月”。 
   EXAMPLE: <% 
fromDate = #8/4/99# 
toDate = #1/1/2000# 
response.write "There are " & _ 
DateDiff("d",fromDate,toDate) & _ 
" days to millenium from 8/4/99." 
%> 

   RESULT: 从8/4/99 到2000年还有 150 天. 

Day() 
   FUNCTION: 返回一个月的第几日 . 
   SYNTAX: Day(date) 
   ARGUMENTS: date 是任何有效的日期。 
   EXAMPLE: <%=Day(#8/4/99#)%> 
   RESULT: 4 

FormatCurrency() 
   FUNCTION: 返回表达式,此表达式已被格式化为货币值 
   SYNTAX: FormatCurrency(Expression [, Digit [, LeadingDigit [, Paren [, GroupDigit>>>>) 
   ARGUMENTS: Digit 指示小数点右侧显示位数的数值。默认值为 -1,指示使用的是计算机的区域设置;   LeadingDigit 三态常数,指示是否显示小数值小数点前面的零。 
   EXAMPLE: <%=FormatCurrency(34.3456)%> 
   RESULT: $34.35 

FormatDateTime() 
   FUNCTION: 返回表达式,此表达式已被格式化为日期或时间 
   SYNTAX: FormatDateTime(Date, [, NamedFormat>) 
   ARGUMENTS: NamedFormat 指示所使用的日期/时间格式的数值,如果省略,则使用 vbGeneralDate. 
   EXAMPLE: <%=FormatDateTime("08/4/99", vbLongDate)%> 
   RESULT: Wednesday, August 04, 1999 

FormatNumber() 
   FUNCTION: 返回表达式,此表达式已被格式化为数值. 
   SYNTAX: FormatNumber(Expression [, Digit [, LeadingDigit [, Paren [, GroupDigit>>>>) 
   ARGUMENTS: Digit 指示小数点右侧显示位数的数值。默认值为 -1,指示使用的是计算机的区域设置。; LeadingDigit i指示小数点右侧显示位数的数值。默认值为 -1,指示使用的是计算机的区域设置。; Paren 指示小数点右侧显示位数的数值。默认值为 -1,指示使用的是计算机的区域设置。; GroupDigit i指示小数点右侧显示位数的数值。默认值为 -1,指示使用的是计算机的区域设置。. 
   EXAMPLE: <%=FormatNumber(45.324567, 3)%> 
   RESULT: 45.325 

FormatPercent() 
   FUNCTION: 返回表达式,此表达式已被格式化为尾随有 % 符号的百分比(乘以 100 )。 (%) 
   SYNTAX: FormatPercent(Expression [, Digit [, LeadingDigit [, Paren [, GroupDigit>>>>) 
   ARGUMENTS: 同上. 
   EXAMPLE: <%=FormatPercent(0.45267, 3)%> 
   RESULT: 45.267% 

Hour() 
   FUNCTION: 以24时返回小时数. 
   SYNTAX: Hour(time) 
   ARGUMENTS: 
   EXAMPLE: <%=Hour(#4:45:34 PM#)%> 
   RESULT: 16 
   (Hour has been converted to 24-hour system) 

Instr() 
   FUNCTION: 返回字符或字符串在另一个字符串中第一次出现的位置. 
   SYNTAX: Instr([start, > strToBeSearched, strSearchFor [, compare>) 
   ARGUMENTS: Start为搜索的起始值,strToBeSearched接受搜索的字符串 strSearchFor要搜索的字符compare 比较方式(详细见ASP常数) 
   EXAMPLE: <% 
strText = "This is a test!!" 
pos = Instr(strText, "a") 
response.write pos 
%> 

   RESULT: 9 

InstrRev() 
   FUNCTION: 同上,只是从字符串的最后一个搜索起 
   SYNTAX: InstrRev([start, > strToBeSearched, strSearchFor [, compare>) 
   ARGUMENTS: 同上. 
   EXAMPLE: <% 
strText = "This is a test!!" 
pos = InstrRev(strText, "s") 
response.write pos 
%> 

   RESULT: 13 


Int() 
   FUNCTION: 返回数值类型,不四舍五入。 
   SYNTAX: Int(number) 
   ARGUMENTS: 
   EXAMPLE: <%=INT(32.89)%> 
   RESULT: 32 

IsArray() 
   FUNCTION: 判断一对象是否为数组,返回布尔值 . 
   SYNTAX: IsArray(name) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = "Test!" 
response.write IsArray(strTest) 
%> 

   RESULT: False 

IsDate() 
   FUNCTION: 判断一对象是否为日期,返回布尔值 
   SYNTAX: IsDate(expression) 
   ARGUMENTS: expression is any valid expression. 
   EXAMPLE: <% 
strTest = "8/4/99" 
response.write IsDate(strTest) 
%> 

   RESULT: True 

IsEmpty() 
   FUNCTION: 判断一对象是否初始化,返回布尔值. 
   SYNTAX: IsEmpty(expression) 
   ARGUMENTS: 
   EXAMPLE: <% 
Dim i 
response.write IsEmpty(i) 
%> 

   RESULT: True 

IsNull() 
   FUNCTION: 判断一对象是否为空,返回布尔值. 
   SYNTAX: IsNull(expression) 
   ARGUMENTS: 
   EXAMPLE: <% 
Dim i 
response.write IsNull(i) 
%> 

   RESULT: False 

IsNumeric() 
   FUNCTION: 判断一对象是否为数字,返回布尔值. 
   SYNTAX: IsNumeric(expression) 
   ARGUMENTS: 
   EXAMPLE: <% 
i = "345" 
response.write IsNumeric(i) 
%> 

   RESULT: True 
   就算数字加了引号,ASP还是认为它是数字。 

IsObject() 
   FUNCTION: 判断一对象是否为对象,返回布尔值. 
   SYNTAX: IsObject(expression) 
   ARGUMENTS: 
   EXAMPLE: <% 
Set con = Server.CreateObject("ADODB.Connection") 
response.write IsObject(con) 
%> 

   RESULT: True 


LBound() 
   FUNCTION: 返回指定数组维的最小可用下标. 
   SYNTAX: Lbound(arrayname [, dimension>) 
   ARGUMENTS: dimension 指明要返回哪一维下界的整数。使用 1 表示第一维,2 表示第二维,以此类  推。如果省略 dimension 参数,默认值为 1. 
   EXAMPLE: <% 
i = Array("Monday","Tuesday","Wednesday") 
response.write LBound(i) 
%> 

   RESULT: 0 

LCase() 
   FUNCTION: 返回字符串的小写形式 
   SYNTAX: Lcase(string) 
   ARGUMENTS: string is any valid string expression. 
   EXAMPLE: <% 
strTest = "This is a test!" 
response.write LCase(strTest) 
%> 

   RESULT: this is a test! 

Left() 
   FUNCTION: 返回字符串左边第length个字符以前的字符(含第length个字符). 
   SYNTAX: Left(string, length) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = "This is a test!" 
response.write Left(strTest, 3) 
%> 

   RESULT: Thi 

Len() 
   FUNCTION: 返回字符串的长度. 
   SYNTAX: Len(string | varName) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = "This is a test!" 
response.write Len(strTest) 
%> 

   RESULT: 15 

LTrim() 
   FUNCTION: 去掉字符串左边的空格. 
   SYNTAX: LTrim(string) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = " This is a test!" 
response.write LTrim(strTest) 
%> 

   RESULT: This is a test! 

Mid() 
   FUNCTION: 返回特定长度的字符串(从start开始,长度为length). 
   SYNTAX: Mid(string, start [, length>) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = "This is a test! Today is Monday." 
response.write Mid(strTest, 17, 5) 
%> 

   RESULT: Today 

Minute() 
   FUNCTION: 返回时间的分钏. 
   SYNTAX: Minute(time) 
   ARGUMENTS: 
   EXAMPLE: <%=Minute(#12:45:32 PM#)%> 
   RESULT: 45 

Month() 
   FUNCTION: 返回日期. 
   SYNTAX: Month(date) 
   ARGUMENTS: date is any valid date expression. 
   EXAMPLE: <%=Month(#08/04/99#)%> 
   RESULT: 8 

MonthName() 
   FUNCTION: Returns a string identifying the specified month. 
   SYNTAX: MonthName(month, [, Abb>) 
   ARGUMENTS: month is the numeric representation for a given month; Abb (optional) is a boolean value used to display month abbreviation. True will display the abbreviated month name and False (default) will not show the abbreviation. 
   EXAMPLE: <%=MonthName(Month(#08/04/99#))%> 
   RESULT: August 

Now() 
   FUNCTION: Returns the current system date and time. 
   SYNTAX: Now() 
   ARGUMENTS: None 
   EXAMPLE: <%=Now%> 
   RESULT: 8/4/99 9:30:16 AM 

Replace() 
   FUNCTION: Returns a string in which a specified sub-string has been replaced with another substring a specified number of times. 
   SYNTAX: Replace(strToBeSearched, strSearchFor, strReplaceWith [, start [, count [, compare>>>) 
   ARGUMENTS: strToBeSearched is a string expression containing a sub-string to be replaced; strSearchFor is the string expression to search for within strToBeSearched; strReplaceWith is the string expression to replace sub-string strSearchFor; start (optional) is the numeric character position to begin search; count (optional) is a value indicating the comparision constant. 
   EXAMPLE: <% 
strTest = "This is an apple!" 
response.write Replace(strTest, "apple", "orange") 
%> 

   RESULT: This is an orange! 

Right() 
   FUNCTION: 返回字符串右边第length个字符以前的字符(含第length个字符). 
   SYNTAX: Right(string, length) 
   ARGUMENTS: . 
   EXAMPLE: <% 
strTest = "This is an test!" 
response.write Right(strTest, 3) 
%> 

   RESULT: st! 

Rnd() 
   FUNCTION: 产生一个随机数. 
   SYNTAX: Rnd [ (number) > 
   ARGUMENTS: 
   EXAMPLE: <% 
Randomize() 
response.write RND() 
%> 

   RESULT: 任何一个在0 到 1 之间的数 

Round() 
   FUNCTION: 返回按指定位数进行四舍五入的数值. 
   SYNTAX: Round(expression [, numRight>) 
   ARGUMENTS: numRight数字表明小数点右边有多少位进行四舍五入。如果省略,则 Round 函数返回整数. 
   EXAMPLE: <% 
i = 32.45678 
response.write Round(i) 
%> 

   RESULT: 32 

Rtrim() 
   FUNCTION: 去掉字符串右边的字符串. 
   SYNTAX: Rtrim(string) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = "This is a test!! " 
response.write RTrim(strTest) 
%> 

   RESULT: This is a test!! 

Second() 
   FUNCTION: 返回秒. 
   SYNTAX: Second(time) 
   ARGUMENTS: . 
   EXAMPLE: <%=Second(#12:34:28 PM#)%> 
   RESULT: 28 

StrReverse() 
   FUNCTION: 反排一字符串 
   SYNTAX: StrReverse(string) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = "This is a test!!" 
response.write StrReverse(strTest) 
%> 

   RESULT: !!tset a si sihT 

Time() 
   FUNCTION: 返回系统时间. 
   SYNTAX: Time() 
   ARGUMENTS: . 
   EXAMPLE: <%=Time%> 
   RESULT: 9:58:28 AM 

Trim() 
   FUNCTION: 去掉字符串左右的空格. 
   SYNTAX: Trim(string) 
   ARGUMENTS: string is any valid string expression. 
   EXAMPLE: <% 
strTest = " This is a test!! " 
response.write Trim(strTest) 
%> 

   RESULT: This is a test!! 

UBound() 
   FUNCTION: 返回指定数组维数的最大可用下标. 
   SYNTAX: Ubound(arrayname [, dimension>) 
   ARGUMENTS: dimension (optional) 指定返回哪一维上界的整数。1 表示第一维,2 表示第二维,以此类推。如果省略 dimension 参数,则默认值为 1. 
   EXAMPLE: <% 
i = Array("Monday","Tuesday","Wednesday") 
response.write UBound(i) 
%> 

   RESULT: 2 

UCase() 
   FUNCTION: 返回字符串的大写形式. 
   SYNTAX: UCase(string) 
   ARGUMENTS: 
   EXAMPLE: <% 
strTest = "This is a test!!" 
response.write UCase(strTest) 
%> 

   RESULT: THIS IS A TEST!! 

VarType() 
   FUNCTION: 返回指示变量子类型的值 
   SYNTAX: VarType(varName) 
   ARGUMENTS: 
   EXAMPLE: <% 
i = 3 
response.write varType(i) 
%> 

   RESULT: 2(数字)详见"asp常数" 

WeekDay() 
   FUNCTION: 返回在一周的第几天. 
   SYNTAX: WeekDay(date [, firstdayofweek>) 
   ARGUMENTS: . 
   EXAMPLE: <% 
d = #8/4/99# 
response.write Weekday(d) 
%> 

   RESULT: 4(星期三) 

WeekDayName() 
   FUNCTION: 返回一周第几天的名字. 
   SYNTAX: WeekDayName(weekday [, Abb [, firstdayofweek>>) 
   ARGUMENTS: Abb可选。Boolean 值,指明是否缩写表示星期各天的名称。如果省略, 默认值为 False,即不缩写星期各天的名称.firstdayofweek指明星期第一天的数值 
   EXAMPLE: <% 
d = #8/4/99# 
response.write WeekdayName(Weekday(d)) 
%> 

   RESULT: Wednesday 

Year() 
   FUNCTION: 返回当前的年份. 
   SYNTAX: Year(date) 
   ARGUMENTS: 
   EXAMPLE: <%=Year(#8/4/99#)%> 

   RESULT: 1999



本文转自 笔头 51CTO博客,原文链接:http://blog.51cto.com/douvip/15416,如需转载请自行联系原作者

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