基于vue实现登录页面

创建Vue项目

使用Vue CLI快速初始化项目：

vue create vue-login-demo
cd vue-login-demo

安装必要依赖

添加路由和状态管理库：

npm install vue-router vuex axios

构建登录组件

在src/components下创建Login.vue：

<template>
  <div class="login-container">
    <h3>用户登录</h3>
    <form @submit.prevent="handleSubmit">
      <div class="form-group">
        <label>用户名</label>
        <input v-model="username" type="text" required>
      </div>
      <div class="form-group">
        <label>密码</label>
        <input v-model="password" type="password" required>
      </div>
      <button type="submit">登录</button>
    </form>
  </div>
</template>

<script>
export default {
  data() {
    return {
      username: '',
      password: ''
    }
  },
  methods: {
    async handleSubmit() {
      try {
        const response = await this.$store.dispatch('login', {
          username: this.username,
          password: this.password
        })
        this.$router.push('/dashboard')
      } catch (error) {
        alert('登录失败: ' + error.message)
      }
    }
  }
}
</script>

<style scoped>
.login-container {
  max-width: 400px;
  margin: 0 auto;
  padding: 20px;
}
.form-group {
  margin-bottom: 15px;
}
input {
  width: 100%;
  padding: 8px;
  box-sizing: border-box;
}
button {
  width: 100%;
  padding: 10px;
  background-color: #42b983;
  color: white;
  border: none;
  cursor: pointer;
}
</style>

配置Vuex存储

在src/store/index.js中设置认证状态：

import Vue from 'vue'
import Vuex from 'vuex'
import axios from 'axios'

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    isAuthenticated: false,
    user: null
  },
  mutations: {
    SET_AUTH(state, payload) {
      state.isAuthenticated = true
      state.user = payload.user
    }
  },
  actions: {
    async login({ commit }, credentials) {
      const response = await axios.post('/api/auth/login', credentials)
      commit('SET_AUTH', { user: response.data.user })
      return response.data
    }
  }
})

设置路由配置

在src/router/index.js中配置路由保护：

import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Dashboard from '../components/Dashboard.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/login',
    name: 'Login',
    component: Login
  },
  {
    path: '/dashboard',
    name: 'Dashboard',
    component: Dashboard,
    meta: { requiresAuth: true }
  }
]

const router = new VueRouter({
  mode: 'history',
  routes
})

router.beforeEach((to, from, next) => {
  if (to.matched.some(record => record.meta.requiresAuth)) {
    if (!store.state.isAuthenticated) {
      next('/login')
    } else {
      next()
    }
  } else {
    next()
  }
})

export default router

实现API拦截器

在src/main.js中设置全局axios配置：

import axios from 'axios'
axios.defaults.baseURL = 'http://your-api-domain.com'
axios.interceptors.request.use(config => {
  const token = localStorage.getItem('token')
  if (token) {
    config.headers.Authorization = `Bearer ${token}`
  }
  return config
})

添加表单验证

扩展登录组件增加验证逻辑：

data() {
  return {
    username: '',
    password: '',
    errors: {}
  }
},
methods: {
  validateForm() {
    this.errors = {}
    if (!this.username) this.errors.username = '请输入用户名'
    if (!this.password) this.errors.password = '请输入密码'
    return Object.keys(this.errors).length === 0
  },
  async handleSubmit() {
    if (!this.validateForm()) return
    // ...原有登录逻辑
  }
}

响应式布局优化

更新样式增强移动端适配：

@media (max-width: 768px) {
  .login-container {
    padding: 10px;
    width: 90%;
  }
  h3 {
    font-size: 1.2rem;
  }
}