我觉得php是最好用的
php版本7.x 开启pdo,嘛~我自己用的,自己理解后修改吧~
登陆:[login.php]
<!DOCTYPE html><html>
<head>
<title>demo</title>
<meta charset="UTF-8">
<style>
a{
width:100px
}
</style>
</head>
<body>
</div>
<form action="" method="post">
<input type="username" placeholder="Account" name="username" id="usr" required autocomplete="off"><br>
<input type="password" placeholder="Password" name="password" id="psd" required autocomplete="off"><br>
<button name="submit" type="submit" id="butn">Login!</button>
</form>
</div>
<style>
body{
background-repeat:no-repeat
}
.head{
background-color:rgba(254,224,223,0.5)
width:100%
}
.getAcc{
border:none
margin:100px auto
box-shadow:4px 4px rgba(255,255,255,0.3)
width:500px
height:300px
background:white
}
.getAcc input{
background:none
padding-bottom:0
border-width:0 0 2px
border-color:rgba(254,224,223,1)
outline:none
}
.getAcc .usr{
position:absolute
left:50%
top:230px
}
.getAcc .psd{
position:absolute
left:50%
top:280px
}
.getAcc button{
position:absolute
left:55%
top:310px
width:100px
height:33px
background:none
border:none
outline:none
margin: auto 5px auto auto
color:rgb(232,122,144)
}
.getAcc button:focus{
background:rgba(244,167,185,0.5)
transition:all 0.5s ease
}
.getAcc input:focus{
border-color:rgb(232,122,144)
transition:all 0.5s ease-in-out
}
div#aira img{
position:absolute
top:210px
left:40%
width:155px
height:220px
margin:auto 5px auto auto
}
.getAcc input{
vertical-align:middle
}
.getAcc form{
margin:10px 10px
}
input:-webkit-autofill{
background-color:none
}
.head a:hover{
width:220px
}
ul a{
width:220px
}
</style>
</body>
<?php
if(isset($_POST["submit"]))//只用submit存在才能执行
{
$dbh = new PDO("mysql:host=数据库地址dbname=数据库名字","用户名","管理密码")
$usr=$_POST["username"]
$pwd=$_POST["password"]
$cusr=$dbh->query("select username from users where username='$usr'")
$cpwd=$dbh->query("select username from users where username='$usr' and password='$pwd'")
//执行查询语句
$row1=$cusr->fetch(PDO::FETCH_BOTH)
//$row1为cusr执行后将返回结果转换成行数组格式
$row2=$cpwd->fetch(PDO::FETCH_BOTH)
if(empty($row1[0]))//若为空则表示没有匹配到任何条目
{
$dbh=null//断开数据库
?>
<script>
alert ("账号不存在")
</script>
<?php
}
else if(empty($row2[0]))//同上
{
$dbh=null
?>
<script>
alert ("密码/账号错误!")
</script>
<?php
}
else
{
$dbh=null
?>
<?php
}
}
?>
注册[register.php]
<!DOCTYPE html><html>
<head>
<title>demo</title>
<meta charset="utf-8">
</head>
<body>
<div id="r_fm">
<form action="" method="post">
<input type="username" id="reg_urn" required name="username" autocomplete="off" placeholder="Username">
<input type="password" id="reg_pwd" required name="password" autocomplete="off" placeholder="Password">
<button name="submit" value="submit">Register</button>
</form>
</div>
</body>
</html>
<?php
if(isset($_POST["submit"]))
{
header("charset='utf-8'")
$dbh = new PDO("mysql:host=数据库地址dbname=数据库名字","用户名","管理密码")
$urn=$_POST["username"]
$check_length = strlen($_POST["password"])
if($check_length<6||$check_length>16)
{
echo '
<script>
alert("The length of the password should between 6 and 26!")
</script>
'
}
else
{
$pwd=$_POST["password"]
$sql = "insert into users values ('$urn','$pwd')"
$ck_true = $dbh->query('select username from users where username="$urn"')
$row_ck1=$ck_true->fetch(PDO::FETCH_BOTH)
if(empty($row_ck1[0]))
{
$dbh->exec($sql)
$dbh=null
echo '
<script>
window.location.href="/login.php"
</script>'
}
else
{
$dbh=null
echo "<script> alert('ERROR') </script>"
}
}
}
?>
<script type="text/javascript" language="javascript">function toUrl(){
var isLogin =用户是否登录(boolean 登录为真，未登录为假)
if(isLogin){
window.location="Login.html"//登录用户去此链接
}else{
window.location="noLogin.html"//未登录用户去此链接
}
}
<script>
<body>
<a href="#" onclick="toUrl()">go to the page</a>
</body>
<html><head> <title>登陆页面</title></head> <form action="login_conf.jsp" method="post"> 用户登陆 用户名：<input type="text" name="uname">密码： <input type="password" name="upassword"> <input type="submit" value="提交"> <input type="reset" value="重置"> </form></body></html>****************************************************验证页面jsp代码如下：<html> <head> <title>用户验证页面</title> </head> <h1>登陆范例-登陆成功</h1></html>不知道你用啥样的前台 是jsp还是asp.net或者是php
