<body>
<form name="form1">
用户名:<input type=text name="username"><br>
密码: <input type=password name="pwd" onkeypress="if(event.keyCode==13)document.form1.submit()"><br>
<input type=submit value=submit>
</form>
</body>
<form name="form1">
用户名:<input type=text name="username"><br>
密码: <input type=password name="pwd" onkeypress="if(event.keyCode==13)document.form1.submit()"><br>
<input type=submit value=submit>
</form>
</body>
sub azheng()
if frm.uname.value="" then
call msgbox("用户名不能为空",48,"提示")
frm.uname.focus
elseif frm.pwd.value ="" then
call msgbox("密码不能为空",48,"提示")
frm.pwd.focus
else
frm.submit
end if
end sub
</script><form name=frm>
<input type="text" name="uname"><br>
<input type="password" name="pwd" onkeypress="javascript:if(event.keyCode==13) azheng();"><br><img src="http://community.csdn.net/images/biaoshi.gif" onclick="azheng()">提交
</form>
<input type="image" src="images/submit.gif" width="16" height="18">