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<script language="javascript">
function add(){
if !(IsNum(document.AddNew.Person.value)){
alert("ÕÐƸÈËÊýÇëÊäÈëÊý×Ö£¡");
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return;
}
AddNew.submit();
}
</script>

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if (IsNum(document.AddNew.Person.value)=="false"){ alert("ÕÐƸÈËÊýÇëÊäÈëÊý×Ö£¡"); document.AddNew.Person.focus();

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if (IsNum(document.AddNew.Person.value)=="false") {
    alert("ÕÐƸÈËÊýÇëÊäÈëÊý×Ö£¡");
    document.AddNew.Person.focus();
return;
  }
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IsNumericÊÇvb½Å±¾ÒªÕâÑùд <script language="vbscript"> function add() if not IsNumeric(document.AddNew.Person.value) msgbox("ÕÐƸÈËÊýÇëÊäÈëÊý×Ö£¡") document.AddNew.Person.focus() else add=true end if end function </script>

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<script language=vbscript>
sub add
if not IsNumeric(document.AddNew.Person.value) then
msgbox("ÕÐƸÈËÊýÇëÊäÈëÊý×Ö£¡")
document.AddNew.Person.value=""
document.AddNew.Person.focus()
end if
end sub
</script>
<form action= name=AddNew method=post>
ÕÐƸÈËÊý£º<input type="text" name="Person" onKeyUp="add">
<input type="submit" name="Submit" value="Ìá½»">
</form>