Design and development practice of UniApp to implement user login and authorization functions

UniApp is a cross-platform application development framework developed based on Vue.js. It can compile the developed code once and generate applications for multiple platforms such as iOS, Android, and H5 at the same time. This article will introduce the design and development practice of implementing user login and authorization functions in UniApp, and illustrate it through code examples.

1. Functional design
User login and authorization functions are an indispensable part of modern applications. Their role is to verify user identity, protect user privacy, and control user access rights. When implementing user login and authorization functions, we need to consider the following aspects:

1. User registration and login: Users can create a new account through the registration function and authenticate through the login function.
2. Third-party login: Support users to log in using third-party accounts, such as WeChat, QQ, Weibo, etc.
3. Authorization management: Manage user access rights and protect user privacy.
4. Information storage: Save the user's login status and related information.

2. Development Practice
The following uses a practical case to illustrate how to implement user login and authorization functions in UniApp.

1. Create login page
   First, create a login directory under the pages directory of UniApp to store login-related pages. Create a login.vue file in the login directory as the template for the login page. The code is as follows:

<template>
  <view>
    <input v-model="username" placeholder="请输入用户名" />
    <button @click="login">登录</button>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        username: ''
      }
    },
    methods: {
      login() {
        // 登录操作
      }
    }
  }
</script>

<style>
  // 样式
</style>

2. Login logic implementation
   In the login.vue file, we wrote a login Method, used to handle the user's login operation. In actual development, we can authenticate by sending a login request, and perform corresponding processing based on the login result. The following is a simple sample code:

methods: {
  login() {
    // 发送登录请求
    api.login({
      username: this.username
    }).then(res => {
      // 登录成功
      // 将登录状态保存到本地
      uni.setStorageSync('token', res.data.token)
      // 跳转到首页
      uni.switchTab({
        url: '/pages/index/index'
      })
    }).catch(err => {
      // 登录失败
      uni.showToast({
        title: '登录失败',
        icon: 'none'
      })
    })
  }
}

In the sample code, we use a module called api to send the login request. After successful login, we save the returned token locally (using the uni.setStorageSync method) and jump to the homepage through uni.switchTab.

3. Authorization Management
   In some cases, we need to control permissions on certain pages or functions to protect user privacy or restrict user access. In UniApp, we can implement permission control through global navigation guards. The following is a simple sample code:

// main.js
import Vue from 'vue'
import App from './App'

// 全局导航守卫
router.beforeEach((to, from, next) => {
  // 从本地获取登录状态
  const token = uni.getStorageSync('token')
  // 如果没有登录，跳转到登录页面
  if (!token && to.path !== '/login') {
    uni.navigateTo({
      url: '/pages/login/login'
    })
  } else {
    next()
  }
})

const app = new Vue({
  ...App
})
app.$mount()

In the sample code, we use the beforeEach method of the global navigation guard to perform permission control by judging the login status and target routing. If the user is not logged in and the target route is not the login page, we will jump to the login page.

4. Third-party login
   UniApp supports the use of third-party plug-ins to implement various third-party login functions, such as using the uexWeiXin plug-in to implement WeChat login. The following is a simple sample code:

methods: {
  login() {
    uexWeiXin.login({
      scope: 'snsapi_userinfo',
      state: 'uniapp',
      success: res => {
        const code = res.code
        // 发送登录请求
        api.loginByWeChat({
          code: code
        }).then(res => {
          // 登录成功
          // 将登录状态保存到本地
          uni.setStorageSync('token', res.data.token)
          // 跳转到首页
          uni.switchTab({
            url: '/pages/index/index'
          })
        }).catch(err => {
          // 登录失败
          uni.showToast({
            title: '登录失败',
            icon: 'none'
          })
        })
      }
    })
  }
}

In the sample code, we use the login method of the uexWeiXin plug-in to implement WeChat login. After successful login, we save the returned token locally and jump to the home page.

3. Summary
Through the introduction of this article, we have learned about the design and development practice of implementing user login and authorization functions in UniApp, and explained it through code examples. User login and authorization are essential functions in modern applications. They can protect user privacy and data security and improve user experience. In actual development, we can flexibly use the development tools and plug-ins provided by UniApp according to project needs and actual conditions to achieve more powerful and secure user login and authorization functions.

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