Why doesn't uniapp open the browser automatically?

When developing a uniapp project, we often use command line tools to start the project. The traditional development method is that after starting the project, the tool will automatically open the default browser and display our project page there. However, some developers have found that when using the latest version of the uniapp framework, the command line tool no longer automatically opens the browser. Why is this? How to solve this problem?

Cause of the problem

First we need to understand the development model of the uniapp project. uniapp adopts a multi-terminal unified development model, and its development process includes two links: local development and compilation and release. During local development, we need to use the command line tool provided by uniapp to start the project, that is, use the npm run dev:%PLATFORM% command. Among them, %PLATFORM% represents the platform corresponding to the current project, such as h5, app, etc. When executing this command, we will find that the console outputs the following information:

 DONE  Compiled successfully in xxxms                                                             
                                                                                        14:38:11

  App running at:
  - Local:   http://localhost:8080/ 

  Network: http://192.168.xxx.xxx:8080/

We can see that in the line Local, the console outputs the access address of our local project , this address is generally http://localhost:8080/. In the traditional development method, the console will also automatically open the browser and display our project page there.

However, in the latest version of the uniapp framework, the command line tool turns off the function of automatically opening the browser by default. This modification is based on security considerations, because the developer's project may contain some sensitive information, and if you open the browser to display the project at will, it may cause security issues.

Solution

Now that we know the cause of the problem, we can take appropriate measures to solve the problem. There are two methods.

Method 1

When executing the startup command of the command line tool, add the -o parameter to realize the function of automatically opening the browser. The instructions are as follows:

npm run dev:%PLATFORM% -o

Among them, the -o parameter means opening the browser.

Method 2

Modify the vue.config.js configuration file and configure the function of automatically opening the browser. The specific steps are as follows:

1. Create a new vue.config.js file in the project root directory.

2. Add the following code in the vue.config.js file:

module.exports = {
  devServer: {
    open: true
  }
}

Among them, open:true means that the browser will be automatically opened when starting the project.

Summary

When using uniapp to develop a project, if the command line tool does not automatically open the browser, we can take the above two methods to solve this problem. However, when modifying the default configuration of the project, you need to pay attention to controlling the developer's sensitive information from being displayed at will to avoid security issues.

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