npm run serve starts error npm ERR Missing script "serve"

When starting the project, I found the following error with npm run serve

npm ERR! Missing script: "serve"npm ERR!npm ERR! To see a list of scripts, run:npm ERR! npm runnpm ERR! A complete log of this run can be found in:npm ERR! D:oderepspm_cache_logs?2-04-24T03_27_08_348Z-debug.log

The solution is this

First look at the first line of the error Missing script: "serve" means that there is no serve this startup script

Then I went to the package.json file to find it

No, there is the following dev

Then I tried to start the project with npm run dev and it worked!

By the way, you should also be curious about the difference between npm run serve and npm run dev.

Actually, npm run dev is used by vue-cli2.0, and npm run serve is used by vue-cli3.0

In essence, it is caused by different versions of vue-cli scaffolding