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HTML5本地储存追加利用html5的本地存储功能实现登录用户信息保存

2017-08-29 09:55 1026 查看
在HTML5中,本地存储是一个window的属性,包括localStorage和sessionStorage,从名字应该可以很清楚的辨认二者的区别,前者是一直存在本地的,后者只是伴随着session,窗口一旦关闭就没了。二者用法完全相同,这里以localStorage为例。

用户名、密码保存,自动登录等,可以通过设置cookie实现,第一次登录网站后在本地计算机的中写入cookie,之后再次登录此网站查看cookie中现有的值,用cookie值进行网站登录即可。但是 cookie 不适合大量数据的存储,因为它们由每个对服务器的请求来传递,这使得 cookie 速度很慢而且效率也不高。

HTML5提供了一个此类问题比较方便的解决方案,就是localstorage。数据不是由每个服务器请求传递的,而是只有在请求时使用数据。它使在不影响网站性能的情况下存储大量数据成为可能。对于不同的网站,数据存储于不同的区域,并且一个网站只能访问其自身的数据。html5 使用 JavaScript 来存储和访问数据。

下面是一个登录保存用户名密码的实例:



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<!DOCTYPE html>

<!--[if lt IE 7 ]> <html lang="en" class="no-js ie6 lt8"> <![endif]-->

<!--[if IE 7 ]> <html lang="en" class="no-js ie7 lt8"> <![endif]-->

<!--[if IE 8 ]> <html lang="en" class="no-js ie8 lt8"> <![endif]-->

<!--[if IE 9 ]> <html lang="en" class="no-js ie9"> <![endif]-->

<!--[if (gt IE 9)|!(IE)]><!-->

<html lang="en" class="no-js">

<!--<![endif]-->

<head>

<meta charset="UTF-8" />

<!-- <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> -->

<title>图书销售管理系统</title>

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<meta name="description"

content="Login and Registration Form with HTML5 and CSS3" />

<meta name="keywords"

content="html5, css3, form, switch, animation, :target, pseudo-class" />

<meta name="author" content="Codrops" />

<link rel="shortcut icon" href="../favicon.ico">

<script type="text/javascript" src="js/jquery.min.js"></script>

</head>

<script>

//先查看是否有本地数据(记住密码)

/* function myfunction(){

var email = localStorage.getItem("email");

var password = localStorage.getItem("password");

if(email!=null&&password!=null){

alert("邮箱:"+email+"密码:"+password);

$.ajax({

url : '../servlet/LoginServlet?choose=login',

data : {

email : email,

password : password

},

dataType : 'json',

success : function(data) {

if (data.msg == "") {

alert("用户名或密码错误");

} else {

//登录成功后保存session,如果选择了记住密码,再保存到本地

//window.location.href ='../index/index.jsp';

}

},

error : function() {

alert("系统错误");

}

});

}else{

//alert("没有信息");

}

}

function saveStorage(){

var email = document.getElementById("email").value;

localStorage.setItem("email",email);

var password = document.getElementById("password").value;

localStorage.setItem("password",password);

}

function login(){

$.ajax({

url : '../servlet/LoginServlet?choose=login',

data : {

email : $('#loginform input[name=email]').val(),

password : $('#loginform input[name=password]').val()

},

dataType : 'json',

success : function(data) {

if (data.msg == "") {

alert("用户名或密码错误");

} else {

//登录成功后保存session,如果选择了记住密码,再保存到本地

window.location.href ='../index/index.jsp';

}

},

error : function() {

alert("系统错误");

}

});

}

function reg(){

$.ajax({

url : 'servlet/LoginServlet?choose=reg',

data : {

username : $('#regform input[name=username]').val(),

password : $('#regform input[name=password]').val(),

email : $('#regform input[name=email]').val(),

},

dataType : 'json',

success : function(data) {

if(data.msg == false){

alert("注册失败");

}else{

alert("注册成功请返回登录");

}

},

error : function() {

alert("系统错误");

}

});

} */

$(document).ready(function(){

//读取 localStage 本地存储,填充用户名密码,如果自动登录有值直接跳转;

//相反,跳转到本页面,等待登陆处理

var storage = window.localStorage;

var getEmail = storage["email"];

var getPwd = storage["password"];

var getisstroepwd = storage["isstorePwd"];

var getisautologin = storage["isautologin"];

if("yes" == getisstroepwd)

{

if("yes" == getisautologin)

{

if(( ("" != getEmail) ||(null != getEmail)) && (("" != getPwd) ||(null != getPwd)))

{

//lacoste 已经保存 登陆信息 直接登陆

// alert('正在自动登录');

$("email").val(getEmail);

$("#password").val(getPwd);

// window.location="";

//加载时显示:正在自动登录

$.ajax({

url : '../servlet/LoginServlet?choose=login',

data : {

email : getEmail,

password : getPwd

},

dataType : 'json',

success : function(data) {

if (data.msg == "") {

alert("账号信息异常,请核实后重新登录");

} else {

//登录成功后保存session,如果选择了记住密码,再保存到本地

//window.location.href ='../index/index.jsp';

}

},

error : function() {

alert("系统错误");

}

});

}

}

else

{

$("#email").val(getEmail);

$("#password").val(getPwd);

document.getElementById("isRemberPwdId").checked = true;

}

}

});

function login(){

var userEmail=$("#email").val();

var userPassWord=$("#password").val();

var storage = window.localStorage;

//记住密码

if(document.getElementById("isRemberPwdId").checked)

{

//存储到loaclStage

storage["email"] = userEmail;

storage["password"] = userPassWord;

storage["isstorePwd"] = "yes";

}

else

{

storage["email"] = userEmail;

storage["isstorePwd"] = "no";

}

//下次自动登录

if(document.getElementById("isAutoLoginId").checked)

{

//存储到loaclStage

storage["email"] = userEmail;

storage["password"] = userPassWord;

storage["isstorePwd"] = "yes";

storage["isautologin"] = "yes";

}

else

{

storage["email"] = userEmail;

storage["isautologin"] = "no";

}

$.ajax({

url : '../servlet/LoginServlet?choose=login',

data : {

email : userEmail,

password : userPassWord

},

dataType : 'json',

success : function(data) {

if (data.msg == "") {

alert("用户名或密码错误");

} else {

//登录成功后保存session,如果选择了记住密码,再保存到本地

window.location.href ='../index/index.jsp';

}

},

error : function() {

alert("系统错误");

}

});

alert("登录成功");

}

</script>

<body>

<div class="container">

<header>

</header>

<section>

<div id="container_demo">

<a class="hiddenanchor" id="toregister"></a> <a class="hiddenanchor"

id="tologin"></a>

<div id="wrapper">

<div id="login" class="animate form">

<form id="loginform" name="loginform" autocomplete="on" method="post">

<h1>登录</h1>

<p>

<label for="username" class="uname" data-icon="u"> 邮箱 </label>

<input id="email" name="email" required="required"

type="text" placeholder="请输入邮箱" autofocus />

</p>

<p>

<label for="password" class="youpasswd" data-icon="p">

密码</label> <input id="password" name="password" required="required"

type="password" placeholder="请输入密码" />

</p>

<p class="keeplogin">

<input type="checkbox" name="isRemberPwdId" id="isRemberPwdId"

/> <label for="loginkeeping">记住密码 </label>

</p>

<p class="keeplogin">

<input type="checkbox" name="isAutoLoginId" id="isAutoLoginId"

/> <label for="autologin">自动登录 </label>

</p>

<p class="login button">

<input type="button" value="登录" onclick="login()" />

</p>

<p class="change_link">

没有账号? <a href="#toregister" class="to_register">前去注册</a>

</p>

</form>

</div>

</div>

</div>

</section>

</div>

</body>

</html>

<!DOCTYPE html>
<!--[if lt IE 7 ]> <html lang="en" class="no-js ie6 lt8"> <![endif]-->
<!--[if IE 7 ]>    <html lang="en" class="no-js ie7 lt8"> <![endif]-->
<!--[if IE 8 ]>    <html lang="en" class="no-js ie8 lt8"> <![endif]-->
<!--[if IE 9 ]>    <html lang="en" class="no-js ie9"> <![endif]-->
<!--[if (gt IE 9)|!(IE)]><!-->
<html lang="en" class="no-js">
<!--<![endif]-->
<head>
<meta charset="UTF-8" />
<!-- <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">  -->
<title>图书销售管理系统</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description"
content="Login and Registration Form with HTML5 and CSS3" />
<meta name="keywords"
content="html5, css3, form, switch, animation, :target, pseudo-class" />
<meta name="author" content="Codrops" />
<link rel="shortcut icon" href="../favicon.ico">

<script type="text/javascript" src="js/jquery.min.js"></script>
</head>
<script>
//先查看是否有本地数据(记住密码)
/* function myfunction(){
var email = localStorage.getItem("email");
var password = localStorage.getItem("password");
if(email!=null&&password!=null){
alert("邮箱:"+email+"密码:"+password);
$.ajax({
url : '../servlet/LoginServlet?choose=login',
data : {
email : email,
password : password
},
dataType : 'json',
success : function(data) {
if (data.msg == "") {
alert("用户名或密码错误");
} else {
//登录成功后保存session,如果选择了记住密码,再保存到本地
//window.location.href ='../index/index.jsp';
}
},
error : function() {
alert("系统错误");
}
});
}else{
//alert("没有信息");

}
}
function saveStorage(){
var email = document.getElementById("email").value;
localStorage.setItem("email",email);
var password = document.getElementById("password").value;
localStorage.setItem("password",password);

}
function login(){
$.ajax({
url : '../servlet/LoginServlet?choose=login',
data : {
email : $('#loginform input[name=email]').val(),
password : $('#loginform input[name=password]').val()
},
dataType : 'json',
success : function(data) {
if (data.msg == "") {
alert("用户名或密码错误");
} else {
//登录成功后保存session,如果选择了记住密码,再保存到本地
window.location.href ='../index/index.jsp';
}
},
error : function() {
alert("系统错误");
}
});
}
function reg(){
$.ajax({
url : 'servlet/LoginServlet?choose=reg',
data : {
username : $('#regform input[name=username]').val(),
password : $('#regform input[name=password]').val(),
email : $('#regform input[name=email]').val(),
},
dataType : 'json',
success : function(data) {
if(data.msg == false){
alert("注册失败");
}else{
alert("注册成功请返回登录");
}
},
error : function() {
alert("系统错误");
}
});
} */
$(document).ready(function(){
//读取 localStage 本地存储,填充用户名密码,如果自动登录有值直接跳转;
//相反,跳转到本页面,等待登陆处理
var storage = window.localStorage;
var getEmail = storage["email"];
var getPwd = storage["password"];
var getisstroepwd = storage["isstorePwd"];
var getisautologin = storage["isautologin"];
if("yes" == getisstroepwd)
{
if("yes" == getisautologin)
{
if(( ("" != getEmail) ||(null != getEmail)) && (("" != getPwd) ||(null != getPwd)))
{
//lacoste  已经保存 登陆信息 直接登陆
// alert('正在自动登录');
$("email").val(getEmail);
$("#password").val(getPwd);
// window.location="";
//加载时显示:正在自动登录
$.ajax({
url : '../servlet/LoginServlet?choose=login',
data : {
email :  getEmail,
password : getPwd
},
dataType : 'json',
success : function(data) {
if (data.msg == "") {
alert("账号信息异常,请核实后重新登录");
} else {
//登录成功后保存session,如果选择了记住密码,再保存到本地
//window.location.href ='../index/index.jsp';
}
},
error : function() {
alert("系统错误");
}
});
}
}
else
{
$("#email").val(getEmail);
$("#password").val(getPwd);
document.getElementById("isRemberPwdId").checked = true;
}
}
});
function login(){
var userEmail=$("#email").val();
var userPassWord=$("#password").val();

var storage = window.localStorage;
//记住密码
if(document.getElementById("isRemberPwdId").checked)
{
//存储到loaclStage

storage["email"] = userEmail;
storage["password"] =  userPassWord;
storage["isstorePwd"] =  "yes";
}
else
{
storage["email"] = userEmail;
storage["isstorePwd"] =  "no";
}

//下次自动登录
if(document.getElementById("isAutoLoginId").checked)
{
//存储到loaclStage
storage["email"] = userEmail;
storage["password"] =  userPassWord;
storage["isstorePwd"] =  "yes";
storage["isautologin"] =  "yes";
}
else
{
storage["email"] = userEmail;
storage["isautologin"] =  "no";
}
$.ajax({
url : '../servlet/LoginServlet?choose=login',
data : {
email : userEmail,
password : userPassWord
},
dataType : 'json',
success : function(data) {
if (data.msg == "") {
alert("用户名或密码错误");
} else {
//登录成功后保存session,如果选择了记住密码,再保存到本地
window.location.href ='../index/index.jsp';
}
},
error : function() {
alert("系统错误");
}
});
alert("登录成功");
}
</script>
<body>
<div class="container">
<header>

</header>
<section>

<div id="container_demo">
<a class="hiddenanchor" id="toregister"></a> <a class="hiddenanchor"
id="tologin"></a>
<div id="wrapper">
<div id="login" class="animate form">
<form id="loginform" name="loginform" autocomplete="on" method="post">
<h1>登录</h1>
<p>
<label for="username" class="uname" data-icon="u"> 邮箱  </label>
<input id="email" name="email" required="required"
type="text" placeholder="请输入邮箱" autofocus />
</p>
<p>
<label for="password" class="youpasswd" data-icon="p">
密码</label> <input id="password" name="password" required="required"
type="password" placeholder="请输入密码" />
</p>
<p class="keeplogin">
<input type="checkbox" name="isRemberPwdId" id="isRemberPwdId"
/> <label for="loginkeeping">记住密码 </label>
</p>
<p class="keeplogin">
<input type="checkbox" name="isAutoLoginId" id="isAutoLoginId"
/> <label for="autologin">自动登录 </label>
</p>
<p class="login button">
<input type="button" value="登录" onclick="login()" />
</p>
<p class="change_link">
没有账号? <a href="#toregister" class="to_register">前去注册</a>
</p>
</form>
</div>
</div>
</div>
</section>
</div>
</body>
</html>
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