asp常用函数(二)

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!