How to implement automatic login function in uniapp

With the continuous development of mobile phone intelligence, mobile APP has become one of the necessary tools in people’s lives. However, every time you open the APP, you need to re-enter your username and password to log in, which is a cumbersome task for users who do not remember the password. In order to solve this problem, many APPs provide automatic login functions. Users only need to log in successfully for the first time and automatically log in when they open the APP again, eliminating the trouble of repeatedly entering their username and password.

In APP development, there are many technical solutions to realize automatic login, including Uniapp. Uniapp is a development framework for developing cross-platform applications based on Vue.js. It can develop iOS, Android and H5 applications at the same time. It can help developers complete the development of cross-platform applications more quickly and efficiently, and can also easily implement automatic login functions. This article will introduce in detail how to implement automatic login in Uniapp and share some development experience with you.

1. What is automatic login

Automatic login means that after the first successful login, when the user uses the same APP again, there is no need to enter the account password again, the system will automatically The user completes login authentication. Compared with the traditional manual login method, automatic login can significantly improve the user's efficiency and reduce the user's login burden.

2. Advantages of automatic login

1. Improve user efficiency

With the popularity of smart phones, APP has become indispensable for people’s life and work One of the tools. In daily use, users often need to log in to various APPs frequently. Repeatedly entering account numbers and passwords is cumbersome and wastes users' time and energy. Automatic login can effectively solve this problem, allowing users to use the APP directly, improving its usage efficiency.

2. Improve user experience

User experience is crucial to the success or failure of APP, and a good user experience needs to be user-centered and reduce the number of user operations and Time costs. The automatic login function can make the user's use process smoother, improve user satisfaction, and bring a good user experience.

3. Improve login security

Using automatic login technology can reduce the risk of password leakage. When manually entering passwords, users can easily leak their passwords due to negligence, but automatic login can make users' login more secure without leaking their account passwords.

3. Solution to realize automatic login

1. Use local storage

In Uniapp, you can use uni.setStorageSync() and uni.getStorageSync( ) method to store the user login status locally. For example, when a user logs in, the user's account and password are saved locally. When the user opens the APP next time, the account and password information is directly retrieved from the local storage for automatic login. The specific operations are as follows:

(1) When the login is successful, call the following code to save the user information locally:

uni.setStorageSync('user_info', json_data);

(2) When the APP starts, check whether there is saved user information locally. If so, call the following code to log in automatically:

var user_info = uni.getStorageSync('user_info');
if (user_info) {
  // 调用登录接口
}

2. Use Token verification

Another way to implement automatic login is to use Token verification. Token is a token used to verify user identity information. The server will return a Token to the client after the user successfully logs in. The client saves the Token and brings it with it the next time it requests data. The server verifies the user's identity information based on the Token to achieve automatic login. The specific operations are as follows:

(1) When logging in, call the following code to obtain the user Token:

uni.request({
  url: 'login_url', 
  method: 'POST',
  data: {},
  success: res => {
    if (res.statusCode == 200) {
      uni.setStorageSync('token', res.data.token);
    }
  }
});

(2) Each time you request data, bring the Token for verification:

var token = uni.getStorageSync('token');
uni.request({
  url: 'data_url', 
  method: 'GET',
  header: {'Authorization': 'Bearer ' + token}, // Bearer 后面有一个空格
  data: {},
  success: res => {
    // 处理数据
  }
});

The above are two ways to implement automatic login. Developers can choose and use them according to their own needs and project characteristics.

4. Issues that need to be paid attention to during the development process

1. User privacy protection

The automatic login function involves the user’s account and password information, so users need to pay attention to Protection of privacy. Developers need to take necessary measures, such as encrypted storage, APP startup password, fingerprint password, etc., to ensure the security of user information.

2. Validity period of Token

Setting the validity period of Token can effectively limit the risk of Token being stolen. Developers need to set the validity period of the Token according to the actual situation. It is generally recommended to set it within a relatively short period of time, such as 30 minutes, 1 hour, etc., to ensure the security of the Token.

3. Login process design

In practice, automatic login also needs to follow the user login process, including user input of account password, user authentication, etc. When designing the login process, user experience and user security need to be fully considered to avoid risks caused by simplicity.

5. Summary

This article introduces how Uniapp implements automatic login. Through the introduction of local storage and Token verification, I believe that readers have mastered the technical principles and operating steps of automatic login in Uniapp. In practice, developers also need to pay attention to issues such as user privacy, token validity period, and login process design, so as to create a more secure, efficient, and user-friendly APP.

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