asp do while 循环语法与do while实例教程

2015-08-12 16:02:59来源:作者:人点击

在do while循环的另一种常用后... Next循环的循环。在do while循环语句重复语句

块的次数不定。重复的陈述或者当条件为真或直到条件变为True。语法如下所示:

Do [While|Until] condition
  statements
Loop

Do 
  statements
Loop [While|Until] condition

在这方面,这个循环内的代码将执行至少一次的情况。在有一个例子:

下面的例子定义了一个循环,开始与i = 0。循环将继续运行,因为我只要小于或等于

10。我将增加1每次循环运行。
Select ActionSelect AllTry It<%
Dim i 'use i as a counter
i = 0 'assign a value to i

Do While i<=10 'Output the values from 0 to 10
  response.write(i & "<br >")
  i = i + 1 'increment the value of i for next time loop executes
Loop
%>
现在,让我们考虑一个更有用的例子,创建下拉几天,几个月或几年清单。您可以使

用此登记表的代码,例如。

<%
'creates an array
Dim month_array(11)
month_array(0) = "January"
month_array(1) = "February"
month_array(2) = "March"
month_array(3) = "April"
month_array(4) = "May"
month_array(5) = "June"
month_array(6) = "July"
month_array(7) = "August"
month_array(8) = "September"
month_array(9) = "October"
month_array(10) = "November"
month_array(11) = "December"

Dim i 'use i as a counter

response.write("<select name=""day"">" & vbCrLf)
i = 1
Do While i <= 31 
   response.write("<option value=" & i & ">" & i & "</option>" & vbCrLf)
   i = i + 1
Loop
response.write("</select>")

response.write("<select name=""month"">" & vbCrLf)
i = 0
Do While i <= 11
   response.write("<option value=" & i & ">" & month_array(i) & "</option>"

& vbCrLf)   
   i = i + 1
Loop
response.write("</select>")

response.write("<select name=""year"">")
i = 1900
Do Until i = 2005   
   response.write("<option value=" & i & ">" & i & "</option>" & vbCrLf)   
   i = i + 1
Loop
response.write("</select>")
%>

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