<script>
function IndexDemo(str2){
var str1
str1=document.all.txtMail.value //用户输入email地址
var s = str1.indexOf(str2);
if(s==-1)
alert('没有找到@');
else
alert('找到@!');
return(s);
}
</script>
strmail="ppp@aa.com"
for i = 1 to len(strmial)
if mid(strmail,i,1) = "@" then
exit for
end if
next
if i <= len(strmail) then
msgbox "有"
else
msgbox "没有"
end if