Npm run dev A project Why does the browser open pwa?

the editor I use is VSC.
there is no problem when I only npm run dev one project;
when I run one project first, and then npm run dev another project, the second project page opened by the browser shows the image above pwa,:

.

solve

Aug.13,2021

your port 8081 process has been killed (= occupied)
as for what's going on with vsc, I haven't used it much (old people don't like to use new editors--).
modify wepack dev port port inconsistencies

two items cannot use the same port,


ask and answer, just find the cache in Application-Cache-Cache Storage in localhost:8081 and delete these caches.
as for the Cache Storage principle, why this problem only occurs in 8081port, we need to figure out

slowly.
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