前端记住密码功能

上周给运营系统补了个记住密码的功能，好像很容易的需求啊，还真费了不少劲，补充了不少cookie方面的知识~特地总结下！

大体思路就是通过存/取/删cookie实现的；每次进入登录页，先去读取cookie，如果浏览器的cookie中有账号信息，就自动填充到登录框中，存cookie是在登录成功之后，判断当前用户是否勾选了记住密码，如果勾选了，则把账号信息存到cookie当中，效果图如下：

浏览器中的cookie信息如下图，注意这里的cookie的expire/Max-Age过期时间，这个时间是格林尼治标准时间GMT，世界统一的时间，GMT+8小时就是北京时间，初中地理没学好，特地去查了下！！

实现代码：

html

<template>    <div class="login-wrapper">        <form class="form-signin" role="form">            <h2 class="form-signin-heading">点播系统</h2>            <input class="form-control" v-model="userName" v-on:keydown="doLogin($event)" placeholder="用户名" required autofocus>            <input type="password" class="form-control" v-model="passWord" v-on:keydown="doLogin($event)" placeholder="Password">            <div class="checkbox remember-password-container">                <input type="checkbox" value="remember-me" v-model="rememberPassword" id="remember-password-checkbox" v-on:click="doRememberPassword($event)">                <label for="remember-password-checkbox">                    Remember me                </label>            </div>            <div class="btn btn-lg btn-primary btn-block" v-on:click="doLogin()">Sign in</div>        </form>    </div></template>

登录处理逻辑js

export default {    // name: 'component2',    data () {        return {            userName: "",            passWord: "",            rememberPassword: false        }    },    // 相当于init doAjax    beforeCreate() {        // console.log('login页面 加载完成！')    },    // 相当于ready 模板编译挂载之后    mounted: function() {        //读取cookie中的账号信息，如果有accountInfo的话，则说明该用户之前勾选了记住密码的功能，则需要自动填上账号密码        this.loadAccountInfo();    },    methods: {        doLogin: function(event){            var mySelf = this;            const router = this.$router;            // console.log(router)            // router.go();            // router.push({path:'/index'})            // console.log(pars.domain)            var mySelf = this;            var userName = mySelf.userName;            var userPwd = mySelf.passWord;            //记住密码checkbox的勾选状态 和账号信息的字符串            var rememberStatus = mySelf.rememberPassword;            var accountInfo = "";            accountInfo = userName + "&" + userPwd;            if (event && event.type == 'keydown' && event.keyCode != 13) {                return;            }            //console.log("用户名：" + userName)            //console.log("密码：" + userPwd)            if (userName == ""){                util.showDialog('error','用户名不能为空！');                return;            }            if (userPwd == ""){                util.showDialog('error','密码不能为空！');                return;            }            $.get( pars.domain + "xxx" + "&t=" + (new Date).getTime(), function(ret) {                if (ret.code == 0) {                    //如果登录成功，则把账号信息保存在cookie当中                    if (rememberStatus){                        console.log("勾选了记住密码，现在开始写入cookie");                        util.setCookie('accountInfo',accountInfo,1440*3);                    }                    else{                        console.log("没有勾选记住密码，现在开始删除账号cookie");                        util.delCookie('accountInfo');                    }                    // 若为本地环境 则手写cookie                    if (window.location.href.indexOf('localhost') != -1){                        util.setCookie('token','zhaopeng_58e0cbbea951f0e79fafcee80da522b8',1440);                    }                    // console.log(window.location.href)                    console.log('登录的返回值为0');                    router.push({path:'/'});                } else {                    util.showDialog('error','账号名或密码错误!');                }            }, "json");        },        doRememberPassword: function(event){            let mySelf = this;            let rememberStatus = mySelf.rememberPassword;            // event.preventDefault();            mySelf.rememberPassword = !rememberStatus;            //如果去掉勾选，则删掉cookie            // if (!rememberStatus){            // }            // mySelf.rememberPassword = false;        },        loadAccountInfo: function(){            let mySelf = this;            //zhaopeng&A15hOsu8YeGnCsjb            let accountInfo = util.getCookie('accountInfo');            //如果cookie里没有账号信息            if(Boolean(accountInfo) == false){                console.log('cookie中没有检测到账号信息！');                return false;            }            else{            //如果cookie里有账号信息                console.log('cookie中检测到账号信息！现在开始预填写！');                let userName = "";                let passWord = "";                let index = accountInfo.indexOf("&");                userName = accountInfo.substring(0,index);                passWord = accountInfo.substring(index+1);                mySelf.userName = userName;                mySelf.passWord = passWord;                mySelf.rememberPassword = true;            }        }    }}

操作cookie逻辑js

// 设置cookiesetCookie: function(c_name,value,expiremMinutes){    var exdate = new Date();    exdate.setTime(exdate.getTime() + expiremMinutes * 60 * 1000);    document.cookie= c_name + "=" + escape(value)+((expiremMinutes==null) ? "" : ";expires="+exdate.toGMTString());},// 读取cookiegetCookie: function(c_name){    if (document.cookie.length>0)    {        var c_start=document.cookie.indexOf(c_name + "=");        if (c_start!=-1)        {         c_start=c_start + c_name.length+1;        var c_end=document.cookie.indexOf(";",c_start);        if (c_end==-1)             c_end = document.cookie.length            return unescape(document.cookie.substring(c_start, c_end))        }    }    return ""   },// 删除cookiedelCookie: function(c_name){    var exp = new Date();    exp.setTime(exp.getTime() - 1);    var cval = this.getCookie(c_name);    if(cval!=null){        document.cookie = c_name + "=" + cval + ";expires=" + exp.toGMTString();    }},