安装不了vew 不知道为什么？

前面的都已经成功提示了 但是最后 npm run dev 之后就没有反应，输入网址也不成功，但是有成功的提示 I Your application is running here: http://localhost:8080 有这个提示

Options: -V, --version output the version number -h, --help output usage information Commands: init generate a new project from a template list list available official templates build prototype a new project create (for v3 warning only) help [cmd] display help for [cmd] andy@DESKTOP-7VBU2HA MINGW64 /f/vue $ vue inst webpack my-project andy@DESKTOP-7VBU2HA MINGW64 /f/vue $ vue inst webpack my-project andy@DESKTOP-7VBU2HA MINGW64 /f/vue $ 后面没有反应 老师

andy@DESKTOP-7VBU2HA MINGW64 /f/vue $ cnpm install -g vue-cli C:\Users\andy\AppData\Roaming\npm\node_modules\cnpm\node_modules\npminstall\node_modules\tar\lib\parse.js:34 const gzipHeader = Buffer.from([0x1f, 0x8b]) ^ TypeError: this is not a typed array. at Function.from (native) at Object.<anonymous> (C:\Users\andy\AppData\Roaming\npm\node_modules\cnpm\node_modules\npminstall\node_modules\tar\lib\parse.js:34:27) at Module._compile (module.js:409:26) at Object.Module._extensions..js (module.js:416:10) at Module.load (module.js:343:32) at Function.Module._load (module.js:300:12) at Module.require (module.js:353:17) at require (internal/module.js:12:17) at Object.<anonymous> (C:\Users\andy\AppData\Roaming\npm\node_modules\cnpm\node_modules\npminstall\node_modules\tar\lib\list.js:10:16) at Module._compile (module.js:409:26) andy@DESKTOP-7VBU2HA MINGW64 /f/vue $ vue init webpack my-project bash: vue: command not found andy@DESKTOP-7VBU2HA MINGW64 /f/vue $ npm install vue vue@2.6.10 node_modules\vue andy@DESKTOP-7VBU2HA MINGW64 /f/vue $ vue bash: vue: command not found andy@DESKTOP-7VBU2HA MINGW64 /f/vue $

还是不行，不知道哪里有问题 安装vue 之后在测试有没有安装的时候就是没安装