Depressed, I have seen it for a long time or I can't see it.
But that is, the Alert window does not display it.
Please thank you for your guidance! ! ! !
<% @ Page ContentType = "text / html; charset = GB2312"%>
Function EMPTY ()
{
IF (Document.form1.Number.Value == "&& Document.form1.name.value ==" && document.form1.hang "
Alert ("The information entered cannot be empty");
Documnet.form1.number.focus ();
Return False;
}
->
script>
HEAD>
Query student information: p>