How does uniapp determine whether the user's login has expired?

In mobile application development, user login and user verification are crucial tasks. They ensure the security and user experience of the application. When using Uniapp for development, we need to pay special attention to user login issues. This article will introduce how to determine whether the user login in Uniapp has expired, and give relevant code examples.

1. What is user login expiration

User login expiration refers to the situation where the user has not performed any operation within a certain period of time and the login credentials are recycled by the server. This is a measure taken by the system to ensure the security of user accounts. In Uniapp, the problem of user login expiration also needs to be solved, otherwise the user will not be able to continue using the application.

2. Uniapp user login expiration solution

In Uniapp, you can use the request interceptor and response interceptor methods to solve the problem of user login expiration. Specifically, you can add a Token in the request interceptor to verify the user's identity information, and determine whether the Token has expired in the response interceptor.

1. Request interceptor

The request interceptor can obtain the Token before sending the request and add the Token to the Header. In this way, in subsequent requests, the server can verify the user's identity information through the Token.

Taking Axios as an example, you can add the following code to the request interceptor:

axios.interceptor.request.use(config => {
  // 从本地Storage获取Token
  const token = uni.getStorageSync('token')
  // 在Header中添加Token
  if (token) {
    config.headers.common['Authorization'] = token
  }
  return config
})

2. Response interceptor

The response interceptor can be returned by the server After the result, the Token is verified. If the token expires, you need to log in again and jump to the login page.

Taking Axios as an example, you can add the following code to the response interceptor:

axios.interceptor.response.use(response => {
  if (response.data.code === 401) {
    // Token过期，需要重新登录
    uni.showToast({
      title: '登录过期，请重新登录',
      icon: 'none'
    })
    uni.redirectTo({
      url: '/pages/login/login'
    })
  }
  return response
})

In this example, the response interceptor will determine the code of the returned result, and if it is 401, jump Go to the login page.

3. Automated processing of user login expiration

In addition to manually adding Token, you can also automatically handle the issue of user login expiration through some functions provided by the Uniapp framework.

1. Using vuex

Vuex is a state management tool that can easily store and obtain data in applications. In Uniapp, user login status can be saved through Vuex. In this way, where user status needs to be obtained, it can be obtained directly from Vuex.

const store = new Vuex.Store({
  state: {
    isLogin: false,
    user: {}
  },
  mutations: {
    login(state, user) {
      state.isLogin = true
      state.user = user
    },
    logout(state) {
      state.isLogin = false
      state.user = {}
    }
  },
  actions: {},
  modules: {},
  getters: {}
})

In this example, through Vuex's state management tool, the two states of isLogin and user can be saved for easy calling in other places.

2. Plug-ins developed using Uni-app

Uni-app, as a cross-platform framework, provides many development plug-ins we need. Among them, there is a very useful vuex-persistedstate plug-in, which can save Vuex data in local Storage.

import createPersistedState from 'vuex-persistedstate'

const store = new Vuex.Store({
  plugins: [
    createPersistedState({
      storage: uni.getStorageSync('vuex')
    })
  ]
})

In this example, the Vuex state can be saved in local Storage through the vuex-persistedstate plug-in. This way, when the user reopens the app, the data is still retained.

4. Summary

In Uniapp, user login expiration is a very common problem. By using the request interceptor and response interceptor methods, as well as the support of Vuex and vuex-persistedstate plug-ins, we can easily solve the problem of user login expiration. At the same time, solving this problem can also improve the security and user experience of the application, so it needs to be taken seriously.

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