vue项目登录页面实现记住用户名和密码

记录一下实现的逻辑，应该分两步来理解这个逻辑

首次登录，页面没有用户的登录信息，实现逻辑如下：
1. 用户输入用户名和密码登录，用户信息为名为form的响应式对象，v-model分别对应两个输入框
2. 用户点击登录实现登录功能
3. 判断是否勾选了记住密码，v-model一个CheckBox，勾选为true，不勾选为false，默认false
  - 若勾选记住密码，则在浏览器的localstorage中写入一个名为loginInfo的对象，值为字符串后的form
  - 若没有勾选，同样在localstorage中写入一个名为loginInfo的对象，值为空
下次再登录，就会根据上一次的勾选状态来判断是否填充form输入框，逻辑如下

挂载页面时，判断localstorage中是否有需要的对象
- 如果有，就把rememberMe的值设为true，并向页面的输入框填充用户名和米面
- 如果没有，就把rememberMe的值设为false
因为逻辑比较简单，就不再画图了

放一下相关的代码

javascript 复制代码

<template>
    <div class="login">
        <el-form ref="formRef" :model="form" :rules="rules" class="login-form">
            <h3 class="title">登录</h3>
            <el-form-item prop="username">
                <el-input v-model="form.username" placeholder="输入账号">
                    <template #prefix>
                        <el-icon class="el-input__icon">
                            <User />
                        </el-icon>
                    </template>
                </el-input>
            </el-form-item>

            <el-form-item prop="password">
                <el-input v-model="form.password" placeholder="输入密码" type="password" show-password
                    @keyup.enter.native="doLogin">
                    <template #prefix>
                        <el-icon>
                            <Lock />
                        </el-icon>
                    </template>
                </el-input>
            </el-form-item>

            <div class="tooltip">
                <el-checkbox v-model="rememberMe" label="记住我" size="large" />
                <div class="register" @click="toRegister">注册账号</div>
                <!-- <a href="#">忘记密码</a> -->
            </div>

            <el-form-item>
                <el-button style="width: 100%" @click="doLogin" class="input">登录</el-button>
            </el-form-item>

            <div class="sep">
                <div style="margin-top: -11px">
                    <label>联系我们</label>
                </div>
            </div>
        </el-form>
    </div>
</template>

<script setup>
import { reactive, ref, onMounted } from 'vue'
import { useUserStore } from '@/stores/user';
import { useRouter } from 'vue-router'
import { ElMessage } from 'element-plus';
const userStore = useUserStore()
const router = useRouter()
import http from '@/utils/http'
// import axios from 'axios'

const rememberMe = ref(false)
const formRef = ref(null)
const form = ref({
    username: '',
    password: ''
})

const rules = {
    username: [
        { required: true, message: "用户名不能为空", trigger: "blur" },
        { min: 2, max: 30, message: "长度在 2 到 30 个字符", trigger: "blur" }
    ],
    password: [
        { required: true, message: "密码不能为空", trigger: "blur" },
        { min: 3, max: 30, message: "长度在 6 到 30 个字符", trigger: "blur" }
    ],
}

const doLogin = () => {
    const { username, password } = form.value
    const data = { username, password }
    // console.log(data)
    formRef.value.validate(async valid => {
        if (valid) {
            try {
                await userStore.getUserInfo(data)
                // console.log('sdfdssff', userStore.userInfo)
                if (userStore.userInfo.Authorization) {
                    if(rememberMe.value){
                        localStorage.setItem('loginInfo', JSON.stringify(form.value))
                    } else {
                        localStorage.setItem('loginInfo', JSON.stringify({}))
                    }
                    router.push('/')
                }
            } catch (error) {
                ElMessage.error('用户名或密码错误')
            }
        }
        else { ElMessage.error('校验没通过') }
    })
}

const toRegister = () => {
    router.push('/register')
}

// 页面加载时监听是否有记住密码
onMounted(() => {
    // console.log(Object.keys(localStorage.getItem('loginInfoTs')))
    if(localStorage.getItem('loginInfo') != null && Object.keys(localStorage.getItem('loginInfo')).length > 2){
        rememberMe.value = true
        const loginInfo = JSON.parse(localStorage.getItem('loginInfo'))
        form.value.username = loginInfo.username
        form.value.password = loginInfo.password
    } else {
        rememberMe.value = false
    }
})
</script>

核心代码是doLogin方法和onMounted中的内容