How the uni app automatically switches the requested address according to the environment

stay vue in , You can use process.env.NODE_ENV To determine whether the current environment is a development environment or a production environment . stay uni-app This value can also be used in to distinguish environments .

Use HBuilderX Development ：

Click on “ function ” The compiled code is the development environment , Click on “ issue ” The compiled code is the production environment

export default BASE_URL =  process.env.NODE_ENV === 'development' ? ' Address of the test ' : ' Official address ' 

Then use the variable in the right place

Or in package.json Middle configuration
https://uniapp.dcloud.io/collocation/package