<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> New Document </title>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
<meta name="Generator" content="EditPlus">
<meta name="Author" content="木野狐">
<meta name="keywords" content="">
<meta name="description" content="">
<SCRIPT LANGUAGE="JavaScript">
<!--
function checkForm(f) {
if (f.username.value == '') {
alert('please input username.');
f.focus();
return false;
}
else
return true;
}
//-->
</SCRIPT>
</head><body><form name="form1" method="post" action="xxx.asp" onsubmit="return checkForm(this);">
<input name="username">
<input type="submit" value="submit">
</form></body>
</html>
<html>
<head>
<title> New Document </title>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
<meta name="Generator" content="EditPlus">
<meta name="Author" content="木野狐">
<meta name="keywords" content="">
<meta name="description" content="">
<SCRIPT LANGUAGE="JavaScript">
<!--
function checkForm(f) {
if (f.username.value == '') {
alert('please input username.');
f.focus();
return false;
}
else
return true;
}
//-->
</SCRIPT>
</head><body><form name="form1" method="post" action="xxx.asp" onsubmit="return checkForm(this);">
<input name="username">
<input type="submit" value="submit">
</form></body>
</html>
f.focus() 改成:f.username.focus();
<input type="button" name="提交" onclick="……" onkeydown="……">
<INPUT TYPE="text" NAME="id"><INPUT TYPE="button" onCLick="javascript:check2()" value="submit">
</FORM><SCRIPT LANGUAGE="JavaScript">
<!--
function check()
{
if(f1.id.value=="")
{
return false;
}
else
{
f1.submit();
return true;
}
}
function check2()
{
if(check()){
f1.submit();
}
else{
return false;
}
}
//-->
</SCRIPT>