NPM run dev error: missing script:dev

When running the Vue project today, an error occurred while running NPM run dev, as shown in the following figure:

Open the package.js folder and find that the scripts in the folder have dev, as shown in the following figure:

But I can’t find it. What’s the reason?Finally, the path is wrong. When Vue init webpack my project, you create a folder and cannot get the corresponding dev

CD to the corresponding folder, re run NPM run dev, OK

Also, the scripts in package. JS do not have dev, which is the case

Enter Vue init webpack to download the missing data in package.json again

“dev”: “webpack-dev-server –inline –progress –config build/webpack.dev.conf.js”,
“start”: “npm run dev”,
“build”: “node build/build.js”

Then install the dependency in NPM intall, and finally NPM run dev

It can also be used to solve the problem of start and build missing