hello-world Project setup npm install Compiles and hot-reloads for development npm run serve Compiles and minifies for production npm run build Lints and fixes files npm run lint Customize configuration See Configuration Reference. 注意 1.一定要用 npm 安装 2.我只找到了一个可播放的视频流，视频流有一定延迟，运行后几秒钟才能播放，