JavaScript+Cookie记住账号密码，登录页面的实现

2021/9/8 17:36:18

编程Tag： cookie javascript function var name document 账号密码 pswd

本文主要是介绍JavaScript+Cookie记住账号密码，登录页面的实现，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <meta name="description" content="">
    <meta name="author" content="">

    <title>Signin Template for Bootstrap</title>

    <!-- Bootstrap core CSS -->
    <link href="css/bootstrap.css" rel="stylesheet">
    <!-- Custom styles for this template -->
    <link href="css/login.css" rel="stylesheet">

    <script>
        //点击更换验证码图片
        function changeImg(img) {
            //html中元素的属性发生改变的时候,浏览器自动刷新
            var time = new Date().getTime()
            img.src = "CodeServlet?time=" + time
        }
    </script>

</head>

<body>

<div class="container">

    <form class="form-signin" action="LoginServlet" method="POST" id="loginForm">
        <div class="text-center">
            <h2 class="form-signin-heading">登录页面</h2>
            <span style="color: red">
                ${loginError}
            </span>
        </div>
        <label for="user" class="sr-only">用户名</label>
        <input type="text" id="user" name="username"
               value = ""
               class="form-control" placeholder="用户名" required autofocus>
        <label for="pswd" class="sr-only">密码</label>
        <input type="password" id="pswd" name="password"
               value = ""
               class="form-control" placeholder="密码" required>

        <input type="text" id="checkcode" name="checkcode" class="form-control" placeholder="验证码">
        <img src="CodeServlet" οnclick="changeImg(this)">

        <div class="checkbox">
            <label>
                <input type="checkbox" id="remember" name="remember" value="yes" > 记住账号密码
            </label>
        </div>
        <button class="btn btn-lg btn-primary btn-block" type="submit">登录</button>
    </form>

</div>

</body>
<script>
    window.onload = function(){
        var oForm = document.getElementById('loginForm');
        var oUser = document.getElementById('user');
        var oPswd = document.getElementById('pswd');
        var oRemember = document.getElementById('remember');
        //页面初始化时，如果帐号密码cookie存在则填充
        if(getCookie('user') && getCookie('pswd')){
            oUser.value = getCookie('user');
            oPswd.value = getCookie('pswd');
            oRemember.checked = true;
        }
        //复选框勾选状态发生改变时，如果未勾选则清除cookie
        oRemember.onchange = function(){
            if(!this.checked){
                delCookie('user');
                delCookie('pswd');
            }
        };
        //表单提交事件触发时，如果复选框是勾选状态则保存cookie
        oForm.onsubmit = function(){
            if(remember.checked){
                setCookie('user',user.value,7); //保存帐号到cookie，有效期7天
                setCookie('pswd',pswd.value,7); //保存密码到cookie，有效期7天
            }
        };
    };
    //设置cookie
    function setCookie(name,value,day){
        var date = new Date();
        date.setDate(date.getDate() + day);
        document.cookie = name + '=' + value + ';expires='+ date;
    };
    //获取cookie
    function getCookie(name){
        var reg = RegExp(name+'=([^;]+)');
        var arr = document.cookie.match(reg);
        if(arr){
            return arr[1];
        }else{
            return '';
        }
    };
    //删除cookie
    function delCookie(name){
        setCookie(name,null,-1);
    };
</script>
</html>

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JavaScript+Cookie记住账号密码，登录页面的实现

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