When using uni-app for the first time, create the project and compile it to run the configuration in the WeChat developer tools.

After the project is successfully compiled, the WeChat developer tool will be opened, but only the initial interface will be opened. Click New and then as shown in the figure, you
need to find the compiled path of the project, such as my project compilation path, where minApp is the project name

D:\minApp\unpackage\dist\dev\mp-weixin

Then configure the editing path to the applet directory, as

shown in the figure. Complete the configuration according to the prompts in the figure, and finally click OK to run the debugging applet.