安装vue-cli以后，build文件夹下面没有dev-server.js文件，浏览器也不再自动打开。

Question

执行npm run dev 命令后，会给一个URL：http://localhost:8081/，而不是自动打开默认浏览器。

Answer 1

config/index.js中，把autoOpenBrowser改成true，就能自动打浏览器了，亲测可用。

Answer 2

更新说明

New /config/index.js options (#975)

dev:
autoOpenBrowser: Wether to open a new browser tab whenever the dev server starts.
useEslint: Wether to use eslint-loader in webpack. Some people might only want to use eslint in their IDE, so the loader can be deactivated here.
showEslintErrorsInOverlay: if using eslint-loader, this option allows to switch of the eslint errors in the error overlay shown in the browser. the errors still appear in the console & terminal, but don't break the workflow in the browser anymore.
notifyOnErrors: will show OS notifications whenever a build fails. Useful when your builds take some time
poll: enables polling mode for webpack's file-change watcher. The default mode doesn't work in some environments, like dropbox folders, Vagrant etc. so switching to polling can fix this.
you can now change sourcemap-related options for the dev and prod builds in the config file.

Answer 3

我也遇到这个问题，真坑爹，现在想写服务端也写不了，自己写又会出很多问题