安装 url-loader(未指定版本)和webpack-dev-server(指定版本),提醒webpack版本依赖,请教解决办法
npm ERR! peerinvalid Peer extract-text-webpack-plugin@1.0.1 wants webpack@^1.9.11
npm ERR! peerinvalid Peer url-loader@2.1.0 wants webpack@^4.0.0
npm ERR! peerinvalid Peer file-loader@4.2.0 wants webpack@^4.0.0
npm ERR! peerinvalid Peer webpack-dev-server@1.16.5 wants webpack@>=1.3.0 <3
webpack-dev-server 未安装成功