How to use uniapp after logging in to the app

With the popularization of smartphones and the rapid development of mobile Internet, more and more applications have entered users' horizons. Against such a background, many developers began to use uniapp to develop their own applications. In application development, how to implement the function that users must log in before using the application has become an important issue.

1. Introduction to uniapp

Uniapp is a cross-platform development framework based on the vue.js framework. It can package a vue into a native application for multiple platforms. The advantage of uniapp is that it can provide application packages for multiple application markets at the same time, that is, an application can be used in both the Android and Apple markets. This feature makes uniapp very popular in mobile development.

2. Methods that can only be used after logging in to the app

In uniapp, the user login function can be implemented in a variety of ways. Below, we will detail some implementation methods.

1. Achieve login status through local storage

In uniapp, local storage is very convenient. Developers can save the user's login status in local storage through the uni.setStorageSync() and uni.getStorageSync() methods. Subsequently, through relevant logic, it is judged whether the user has logged in to determine whether to allow the use of the application. It should be noted that when packaging applications for multiple markets, local storage requires the use of the uni-app-plus plug-in to achieve cross-platform implementation.

2. Use back-end API to achieve login status

Different from local storage, it is more common to use back-end API to achieve user login status. Developers can save the user's login status information in the back-end server. When a user accesses an application, the backend server automatically returns the user's status information to the application. Through relevant logic processing, the application can automatically determine whether the user has logged in and decide whether to allow the user to continue using it.

It should be noted that when using the back-end API to implement login status, different HTTP exception status codes need to be distinguished. When the user is not logged in, the application may receive a 401 or 403 exception status code. It is necessary to use relevant logic to determine the status code and return the corresponding prompt information.

3. Summary

The method of processing user login status in uniapp can be through local storage or back-end API. Taking into account the characteristics of cross-platform development, the use of back-end APIs is more extensive. However, no matter which method is used, the security and user experience of the application need to be guaranteed. Only by fully considering these factors can we meet the expectations of users and developers.

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