asp教程：去掉一组字符串中的重复数字

在一次面试的过程中有一道题：给你一个数字字符串：str="11,33,22,33,44,55,111,22,444,22,44,555"，要求用asp实现，去掉这个字符串中重复的数字，代码如下：

<%
str="11,33,22,33,44,55,111,22,444,22,44,555"
response.write "开始前:"&str&"<br>"
a=split(str,",")
str2=""

for i=0 to ubound(a)	
  if instr(","&str2&",",","&a(i)&",")<=0 then
	  str2=str2&","&a(i)
  end if
next
response.write "结果："
if len(str2)>0 then str2=right(str2,len(str2)-1)
response.write str2&"<br />"
%>