拦截表单的另外一种写法
类别: ASP教程 
<script language="vbs">
sub send_onclick
dim f
set f=document.ff
photo=trim(f.photo.value)
if photo="" then
msgbox "没有照片，怎么传！ ",64 ,"上传"
f.photo.focus
exit sub
end if
f.submit
end sub
sub retu_onclick
history.back
end sub
</script>
<form method=POST action=saveedit.asp name=ff enctype=multipart/form-data>
<input type=file name=photo>
<input type=button value=开始上传 name=send>
</form>
sub send_onclick
dim f
set f=document.ff
photo=trim(f.photo.value)
if photo="" then
msgbox "没有照片，怎么传！ ",64 ,"上传"
f.photo.focus
exit sub
end if
f.submit
end sub
sub retu_onclick
history.back
end sub
</script>
<form method=POST action=saveedit.asp name=ff enctype=multipart/form-data>
<input type=file name=photo>
<input type=button value=开始上传 name=send>
</form>
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