cookie示例：登陆页面中的记住密码功能

最新推荐文章于 2025-07-09 13:33:41 发布

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#HTML #JavaScript #XHTML #浏览器 #Go #ViewUI

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本文介绍了一个简单的登录系统实现过程，包括HTML页面设计、JavaScript中cookie的管理及登录验证逻辑。系统由登录页面与欢迎页面组成，能保存用户名与密码。

CONTENT
    login.html
    welcome.html
    cookie.js
    common.js

Html代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>login</title>
<script type="text/javascript" src="cookie.js"></script>
<script type="text/javascript" src="common.js"></script>
</head>
<body>
<form action="">
<p>
<span>UserName:</span>
<input id="userName" type="text" value=""/></p>
<p>
<span>Password:</span>
<input id="password" type="password" value=""/></p>
<p>
<span style="font-size:12px; color:blue;">记住密码</span>
<input id="saveCookie" type="checkbox" value="" /></p>
<p>
<input id="submit" type="button" value="GO" />
</p>
</form>
</body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>login</title>
<script type="text/javascript" src="cookie.js"></script>
<script type="text/javascript" src="common.js"></script>
</head>
<body>
<form action="">
<p>
    <span>UserName:</span>
    <input id="userName" type="text" value=""/></p>
<p>
    <span>Password:</span>
    <input id="password" type="password" value=""/></p>
<p>
    <span style="font-size:12px; color:blue;">记住密码</span>
    <input id="saveCookie" type="checkbox" value="" /></p>
<p>
    <input id="submit" type="button" value="GO" />
</p>
</form>
</body>
</html>

welcome.html

Html代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>welcome</title>
</head>
<body>
<h1>Welcome!</h1>
<a href="login.html">点击返回登陆框</a>
</body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>welcome</title>
</head>
<body>
<h1>Welcome!</h1>
<a href="login.html">点击返回登陆框</a>
</body>
</html>

cookie.js

Js代码

//新建cookie。
//hours为空字符串时,cookie的生存期至浏览器会话结束。hours为数字0时,建立的是一个失效的cookie,这个cookie会覆盖已经建立过的同名、同path的cookie（如果这个cookie存在）。
function setCookie(name,value,hours,path){
var name = escape(name);
var value = escape(value);
var expires = new Date();
expires.setTime(expires.getTime() + hours*3600000);
path = path == "" ? "" : ";path=" + path;
_expires = (typeof hours) == "string" ? "" : ";expires=" + expires.toUTCString();
document.cookie = name + "=" + value + _expires + path;
}
//获取cookie值
function getCookieValue(name){
var name = escape(name);
//读cookie属性，这将返回文档的所有cookie
var allcookies = document.cookie;
//查找名为name的cookie的开始位置
name += "=";
var pos = allcookies.indexOf(name);
//如果找到了具有该名字的cookie，那么提取并使用它的值
if (pos != -1){ //如果pos值为-1则说明搜索"version="失败
var start = pos + name.length; //cookie值开始的位置
var end = allcookies.indexOf(";",start); //从cookie值开始的位置起搜索第一个";"的位置,即cookie值结尾的位置
if (end == -1) end = allcookies.length; //如果end值为-1说明cookie列表里只有一个cookie
var value = allcookies.substring(start,end); //提取cookie的值
return unescape(value); //对它解码
}
else return ""; //搜索失败，返回空字符串
}
//删除cookie
function deleteCookie(name,path){
var name = escape(name);
var expires = new Date(0);
path = path == "" ? "" : ";path=" + path;
document.cookie = name + "="+ ";expires=" + expires.toUTCString() + path;
}

//新建cookie。
//hours为空字符串时,cookie的生存期至浏览器会话结束。hours为数字0时,建立的是一个失效的cookie,这个cookie会覆盖已经建立过的同名、同path的cookie（如果这个cookie存在）。
function setCookie(name,value,hours,path){
    var name = escape(name);
    var value = escape(value);
    var expires = new Date();
    expires.setTime(expires.getTime() + hours*3600000);
    path = path == "" ? "" : ";path=" + path;
    _expires = (typeof hours) == "string" ? "" : ";expires=" + expires.toUTCString();
    document.cookie = name + "=" + value + _expires + path;
}
//获取cookie值
function getCookieValue(name){
    var name = escape(name);
    //读cookie属性，这将返回文档的所有cookie
    var allcookies = document.cookie;       
    //查找名为name的cookie的开始位置
    name += "=";
    var pos = allcookies.indexOf(name);    
    //如果找到了具有该名字的cookie，那么提取并使用它的值
    if (pos != -1){                                             //如果pos值为-1则说明搜索"version="失败
        var start = pos + name.length;                  //cookie值开始的位置
        var end = allcookies.indexOf(";",start);        //从cookie值开始的位置起搜索第一个";"的位置,即cookie值结尾的位置
        if (end == -1) end = allcookies.length;        //如果end值为-1说明cookie列表里只有一个cookie
        var value = allcookies.substring(start,end);  //提取cookie的值
        return unescape(value);                           //对它解码      
        }   
    else return "";                                             //搜索失败，返回空字符串
}
//删除cookie
function deleteCookie(name,path){
    var name = escape(name);
    var expires = new Date(0);
    path = path == "" ? "" : ";path=" + path;
    document.cookie = name + "="+ ";expires=" + expires.toUTCString() + path;
}

common.js

Js代码

function $(objStr){return document.getElementById(objStr);}
window.onload = function(){
//分析cookie值，显示上次的登陆信息
var userNameValue = getCookieValue("userName");
$("userName").value = userNameValue;
var passwordValue = getCookieValue("password");
$("password").value = passwordValue;
//写入点击事件
$("submit").onclick = function()
{
var userNameValue = $("userName").value;
var passwordValue = $("password").value;
//服务器验证（模拟）
var isAdmin = userNameValue == "admin" && passwordValue =="123456";
var isUserA = userNameValue == "userA" && passwordValue =="userA";
var isMatched = isAdmin || isUserA;
if(isMatched){
if( $("saveCookie").checked){
setCookie("userName",$("userName").value,24,"/");
setCookie("password",$("password").value,24,"/");
}
alert("登陆成功,欢迎你," + userNameValue + "!");
self.location.replace("welcome.html");
}
else alert("用户名或密码错误，请重新输入！");
}
}

function $(objStr){return document.getElementById(objStr);}
window.onload = function(){
    //分析cookie值，显示上次的登陆信息
    var userNameValue = getCookieValue("userName");
    $("userName").value = userNameValue;
    var passwordValue = getCookieValue("password");
    $("password").value = passwordValue;    
    //写入点击事件
    $("submit").onclick = function()
    {
        var userNameValue = $("userName").value;
        var passwordValue = $("password").value;
        //服务器验证（模拟）    
        var isAdmin = userNameValue == "admin" && passwordValue =="123456";
        var isUserA = userNameValue == "userA" && passwordValue =="userA";
        var isMatched = isAdmin || isUserA;
        if(isMatched){
            if( $("saveCookie").checked){  
                setCookie("userName",$("userName").value,24,"/");
                setCookie("password",$("password").value,24,"/");
            }    
            alert("登陆成功,欢迎你," + userNameValue + "!");
            self.location.replace("welcome.html");
        }
        else alert("用户名或密码错误，请重新输入！");    
    }
}