How to update uniapp without overwriting the installation

With the popularity of smartphones, mobile applications have become an indispensable part of people's daily lives. In order to meet the changing needs and constantly updated features, developers constantly release new versions of applications.

During the application update process, usually the easiest way is to directly overwrite the installation. This process is done by downloading a new version and replacing the old one. Although this method seems very convenient, it also has some disadvantages.

First of all, the overlay installation may take a while, and during the process, the user cannot use the application. Secondly, during the overlay installation process, all user data will be deleted, which may cause unnecessary trouble and distress to users.

In order to solve these problems, developers began to use a new technology: incremental updates. Incremental updates download only the files that have been changed, rather than the entire application. Therefore, this method can greatly reduce download time, reduce user data loss, and provide a better user experience.

In mobile application development, uniapp is a quite popular development framework. It can write the same set of code into multiple different applications, such as developing iOS and Android applications at the same time. For uniapp application updates, we can also perform incremental updates without overwriting the installation to improve user experience.

Using uni-app's incremental update method may not be as difficult as we think. To implement this technique, we need to perform the following steps:

1. Build the complete application: This is a complete copy of the new version of the application. This step can be accomplished by entering and executing the command uni build --platform [platform] --watch at the command line, where [platform] refers to the platform that the application will support operating system platform, such as "ios" or "android".
2. Create an incremental update package: An incremental update package consists of the differences between the previous version and the current version. A third-party library or professional incremental update software must be used to generate incremental update packages.
3. Upload the update package to the server: The update package must be uploaded to the server, and ensure that the corresponding URL in the server has been configured.
4. Introduce the JSBridge library and decompress the incremental update package: You can use the third-party library JSBridge to help uni-app perform decompression and other operations during the running process of the application to ensure that the incremental update package is correctly applied .

Through these steps, we can easily implement incremental updates of the uni-app application. Compared with the overlay installation method, this method can not only reduce download and update time, but also minimize the loss of user data. Additionally, this approach allows users to not have to wait for the entire application installation process but to start using the application immediately.

In short, for developers, incremental updates can help broaden the application market and improve user experience. For users, incremental updates can significantly reduce update time and impact on data. Of course, this is just one approach, and it's not the best solution for every situation. In practical applications, developers need to choose the most appropriate update method according to specific situations to improve the quality of the application.

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