在用ASP编写页面时，如果涉及到邮件发送，一般会要求输入Email地址。错误的Email地址往往带来许多不必要的麻烦，用下面的函数IsValidEmail就能判断出一个Email地址是否有效。 函数源代码： <% Function IsValidEmail(Email) ValidFlag = False If (Email <> "") And (InStr(1, Email, "@") > 0) And (InStr(1, Email, ".") > 0) Then atCount = 0 SpecialFlag = False For atLoop = 1 To Len(Email) atChr = Mid(Email, atLoop, 1) If atChr = "@" Then atCount = atCount + 1 If (atChr >= Chr(32)) And (atChr <= Chr(44)) Then SpecialFlag = True If (atChr = Chr(47)) Or (atChr = Chr(96)) Or (atChr >= Chr(123)) Then SpecialFlag = True If (atChr >= Chr(58)) And (atChr <= Chr(63)) Then SpecialFlag = True If (atChr >= Chr(91)) And (atChr <= Chr(94)) Then SpecialFlag = True Next If (atCount = 1) And (SpecialFlag = False) Then BadFlag = False tAry1 = Split(Email, "@") UserName = tAry1(0) DomainName = tAry1(1) If (UserName = "") Or (DomainName = "") Then BadFlag = True If Mid(DomainName, 1, 1) = "." then BadFlag = True If Mid(DomainName, Len(DomainName), 1) = "." then BadFlag = True ValidFlag = True End If End If If BadFlag = True Then ValidFlag = False IsValidEmail = ValidFlag End Function %> 用法举例： IsValidEmail("my_263_email@263.net") 返回Ture IsValidEmail("zh99wj@tonghua.com.cn") 返回Ture IsValidEmail("myemail263.net") 返回False IsValidEmail("my_263_email@263) 返回False 请注意，函数只是判断Email地址格式是否有效，但并不能检查该地址是否确实存在。
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