How to develop authentication functionality using uniapp

How to use UniApp to develop authentication functions

1. Background introduction
With the development of the mobile Internet, the authentication function has been widely used in various applications. As a cross-platform development framework based on Vue.js, UniApp supports the development of multiple platforms at the same time, so it can be easily used to develop applications with authentication functions. This article will introduce how to use UniApp to develop authentication functions and provide code samples for your reference.

2. Implementation ideas

1. Create a login page: The first step in developing the identity authentication function is to create a login page. The user can authenticate after entering their account number and password.
2. Authentication interface: By calling the authentication interface, the account number and password entered by the user are sent to the back-end server for verification. After passing the verification, a token or other identity identifier is returned.
3. Token management: Save the token returned by the interface locally. You can use the uni.setStorageSync() method to store the token in the local cache. Afterwards, you can use the uni.getStorageSync() method to obtain the token for authentication.
4. Route guard: By using the route guard mechanism of uni-app, authentication can be performed every time the route jumps, ensuring that the user is logged in before accessing relevant pages.
5. Logout function: Provides a logout function. Users can actively log out of the login status and clear locally saved tokens.

3. Code example

1. Create a login page
   Create a login page (login.vue) in the uni-app project:

   <template>
     <view>
    <input v-model="account" placeholder="请输入账号" />
    <input v-model="password" placeholder="请输入密码" />
    <button @click="login">登录</button>
     </view>
   </template>
   
   <script>
   export default {
     data() {
    return {
      account: '',
      password: '',
    };
     },
     methods: {
    login() {
      // 调用身份验证接口进行身份验证
      // ...
      // 验证成功后将token存储在本地
      uni.setStorageSync('token', 'abcd');
      // 跳转到需要验证的页面
      uni.redirectTo({
        url: '/pages/index/index',
      });
    },
     },
   };
   </script>

2. Route guard
   Use route guard in main.js in the uni-app project:

   import Vue from 'vue';
   import App from './App';
   import store from './store';
   
   Vue.config.productionTip = false;
   
   App.mpType = 'app';
   
   const app = new Vue({
     ...App,
   });
   
   app.$mount();
   
   // 路由守卫
   uni.$router.beforeEach((to, from, next) => {
     const token = uni.getStorageSync('token');
     if (!token && to.path !== '/login') {
    // 如果未登录且不是跳转到登录页，则跳转到登录页
    next('/login');
     } else {
    next();
     }
   });

3. Logout function
   Create a logout method

   // 添加一个方法
   methods: {
     logout() {
    // 清除本地保存的token
    uni.removeStorageSync('token');
    // 跳转到登录页
    uni.redirectTo({
      url: '/pages/login/login',
    });
     },
   }

The above is an example of the development of a simple UniApp authentication function. By authenticating on the login page, saving the token locally, and then authenticating the user through the routing guard , which can implement basic authentication functions.

4. Summary
UniApp is a cross-platform development framework that can easily develop applications with authentication functions. Through the introduction of this article, we understand UniApp’s ideas for developing identity authentication functions, and provide code examples for your reference. I hope this article will be helpful to everyone when developing authentication functions using UniApp.

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