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一、项目搭建与基础配置

1. 环境准备
   使用 Vue CLI 或 Vite 创建项目，推荐组合：Vue3 + Element Plus + Vue Router

   npm create vue@latest
   npm install element-plus @element-plus/icons-vue vue-router

2. 全局配置（main.js）

   
   import { createApp } from 'vue'
   import ElementPlus from 'element-plus'
   import router from './router'
   import 'element-plus/dist/index.css'const app = createApp(App)
   app.use(ElementPlus)
   app.use(router)
   app.mount('#app')

二、登录页面核心实现

1. 模板结构（login.vue）

   <template><div class="login-container"><el-form ref="formRef" :model="form" :rules="rules"><h2 class="title">校园交易平台</h2><el-form-item prop="username"><el-inputv-model="form.username"prefix-icon="User"placeholder="请输入手机号"/></el-form-item><el-form-item prop="password"><el-inputv-model="form.password"prefix-icon="Lock"type="password"show-passwordplaceholder="请输入密码"@keyup.enter="handleLogin"/></el-form-item><el-button type="primary" :loading="loading"@click="handleLogin">登录</el-button><div class="links"><router-link to="/register">立即注册</router-link><router-link to="/forgot">忘记密码?</router-link></div></el-form></div>
   </template>

2. 数据与验证逻辑

   <script setup>
   import { ref, reactive } from 'vue'
   import { useRouter } from 'vue-router'
   import { ElMessage } from 'element-plus'const form = reactive({username: '',password: ''
   })const rules = reactive({username: [{ required: true, message: '请输入手机号', trigger: 'blur' },{ pattern: /^1[3-9]\d{9}$/, message: '手机号格式错误' }],password: [{ required: true, message: '请输入密码', trigger: 'blur' },{ min: 6, max: 16, message: '长度6-16位' }]
   })const loading = ref(false)
   const formRef = ref(null)
   const router = useRouter()const handleLogin = async () => {try {await formRef.value.validate()loading.value = true// 模拟API请求await new Promise(resolve => setTimeout(resolve, 1000))sessionStorage.setItem('token', 'demo_token')ElMessage.success('登录成功')router.replace('/dashboard')} catch (error) {console.error('登录失败:', error)} finally {loading.value = false}
   }
   </script>

3. 样式优化要点

   
   <style scoped>
   .login-container {height: 100vh;display: grid;place-items: center;background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
   }.title {text-align: center;margin-bottom: 2rem;color: #2c3e50;font-size: 1.8rem;
   }:deep(.el-form) {width: 400px;padding: 2rem;background: rgba(255,255,255,0.95);border-radius: 12px;box-shadow: 0 4px 20px rgba(0,0,0,0.1);
   }.el-button {width: 100%;margin-top: 1rem;
   }.links {margin-top: 1.5rem;display: flex;justify-content: space-between;a {color: #409eff;text-decoration: none;transition: color 0.3s;&:hover {color: #66b1ff;}}
   }
   </style>

三、进阶功能实现

1. 路由守卫配置

   // router/index.js
   router.beforeEach((to) => {const isAuthenticated = sessionStorage.getItem('token')if (to.meta.requiresAuth && !isAuthenticated) {return '/login'}if (to.path === '/login' && isAuthenticated) {return '/dashboard'}
   })

2. 安全增强方案

   • 密码加密传输（使用crypto-js）

   • 添加验证码功能

   • 请求限流与防重放攻击

   import CryptoJS from 'crypto-js'const encryptPassword = (password) => {return CryptoJS.SHA256(password).toString()
   }

3. 第三方登录集成

   <template><div class="oauth-login"><el-divider>第三方登录</el-divider><div class="oauth-buttons"><el-button @click="handleWechatLogin"><svg-icon icon-class="wechat" />微信登录</el-button></div></div>
   </template>

四、最佳实践与注意事项

1. 表单验证优化

   •   异步验证手机号是否注册

   •  密码强度实时检测

   const checkUsername = async (rule, value, callback) => {if (!value) return callback(new Error('请输入手机号'))if (!/^1[3-9]\d{9}$/.test(value)) return callback(new Error('格式错误'))try {const { data } = await api.checkUsername(value)if (!data.exist) callback(new Error('该用户未注册'))} catch (error) {callback(new Error('验证失败'))}
   }

2. 用户体验优化

   • 自动填充最近登录账号

   • 记住密码功能（加密存储）

   • 加载状态管理

   // 自动填充
   const lastUsername = localStorage.getItem('lastUsername')
   if (lastUsername) form.username = lastUsername// 记住密码
   const savePassword = ref(false)
   watch(savePassword, (val) => {if (val) {localStorage.setItem('remembered', JSON.stringify(form))} else {localStorage.removeItem('remembered')}
   })

3. 错误处理规范

   try {const res = await loginApi(formData)if (res.code === 1001) {ElMessage.warning('该账号已被冻结')}
   } catch (err) {ElMessage.error({message: `登录失败: ${err.message}`,grouping: true  // 相同错误合并显示})
   }

五、典型问题解决方案

1. 跨域问题处理

   // vite.config.js
   export default defineConfig({server: {proxy: {'/api': {target: 'http://backend.example.com',changeOrigin: true,rewrite: (path) => path.replace(/^\/api/, '')}}}
   })

2. 响应式布局适配

   @media (max-width: 768px) {.login-container {padding: 1rem;:deep(.el-form) {width: 100%;margin: 0 1rem;}}
   }

3. 浏览器兼容问题

   • 使用@vitejs/plugin-legacy处理ES6+语法

   • 添加autoprefixer自动补全CSS前缀