标签：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<meta name="keywords" content="html,javascript,css">
<script type="text/javascript">
function denglu()
{
var userno=document.getElementById("userno").value;
var userpwd=document.getElementById("userpwd").value;
if(userno=="")
{
return false;
}
else if(userpwd=="")
{
return false;
}
else
{
return true;
}
}
</script>
</head>
<body>
<form id="form1" action="test_login_handle.php" method="post">
<div>账号：<input type="text" id="userno" placeholder="输入用户账号" /></div>
<div>密码：<input type="password" id="userpwd" placeholder="输入用户密码" /></div>
<div><input type="submit" value="登录" onclick="return denglu()" /></div>
</form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<meta name="keywords" content="html,javascript,css">
<script type="text/javascript">
function denglu()
{
var userno=document.getElementById("userno").value;
var userpwd=document.getElementById("userpwd").value;
if(userno=="")
{
return false;
}
else if(userpwd=="")
{
return false;
}
else
{
return true;
}
}
</script>
</head>
<body>
<form id="form1" action="test_login_handle.php" method="post" onsubmit="return denglu()">
<div>账号：<input type="text" id="userno" placeholder="输入用户账号" /></div>
<div>密码：<input type="password" id="userpwd" placeholder="输入用户密码" /></div>
<div><input type="submit" value="登录" /></div>
</form>
</body>
</html>
<<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<meta name="keywords" content="html,javascript,css">
<script type="text/javascript">
function denglu()
{
var userno=document.getElementById("userno").value;
var userpwd=document.getElementById("userpwd").value;
if(userno=="")
{
return false;
}
else if(userpwd=="")
{
return false;
}
else
{
document.form1.submit();
}
}
</script>
</head>
<body>
<form id="form1" action="test_login_handle.php" method="post">
<div>账号：<input type="text" id="userno" placeholder="输入用户账号" /></div>
<div>密码：<input type="password" id="userpwd" placeholder="输入用户密码" /></div>
<div><input type="button" value="登录" onclick="denglu()" /></div>
</form>
</body>
</html>
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原文地址：http://www.cnblogs.com/zizaifeihuaqingsimeng/p/5947444.html
