1、错误场景：安装vue插件的时候，报错，提示安装最新版本
npm ERR! Windows_NT 6.1.7601 npm ERR! argv "D:\\Program Files\\nodejs\\node.exe" "C:\\Users\\Administrator.CE-20151109NQJC\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "run" "dev" npm ERR! node v10.15.3 npm ERR! npm v3.10.10 npm ERR! code ELIFECYCLE npm ERR! muse-ui@3.0.2 dev: `NODE_ENV=normal parcel demo/index.html` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the muse-ui@3.0.2 dev script 'NODE_ENV=normal parcel demo/index.html'. npm ERR! Make sure you have the latest version of node.js and npm installed. npm ERR! If you do, this is most likely a problem with the muse-ui package, npm ERR! not with npm itself. npm ERR! Tell the author that this fails on your system: npm ERR! NODE_ENV=normal parcel demo/index.html npm ERR! You can get information on how to open an issue for this project with: npm ERR! npm bugs muse-ui npm ERR! Or if that isn't available, you can get their info via: npm ERR! npm owner ls muse-ui npm ERR! There is likely additional logging output above. npm ERR! Please include the following file with any support request: npm ERR! F:\frame\vue\muse-ui-master\npm-debug.log
2、查看版本
npm -v
3、安装最新版本（全局）
npm install -g npm
4、安装指定版本（@后面跟版本号）
npm -g install npm@6.9.0
5、node版本升级
官网下载最新安装包，安装覆盖
6、安装另外一个包的时候，还是有报错，
C:\Users\Administrator.CE-20151109NQJC\AppData\Roaming\npm npm WARN deprecated autoprefixer-loader@3.2.0: Please use postcss-loader instead of autoprefixer-loader npm WARN deprecated babel-preset-es2015@6.24.1: � Thanks for using Babel: we recommend using babel-preset-env now: please read babeljs.io/env to update! npm ERR! Unexpected end of JSON input while parsing near '...ata-0.0.10.tgz"}},"0.' npm ERR! A complete log of this run can be found in: npm ERR! C:\Users\Administrator.CE-20151109NQJC\AppData\Roaming\npm-cache\_logs\2019-04-01T09_59_14_849Z-debug.log
错误原因分析：
使用命令npm install xx安装包的时候，默认是从npm的镜像源服务器进行下载的，该服务器是放在国外，很容易安装失败，因此全局安装nrm镜像源管理器,nrm里面存放了多个镜像源服务器
npm isntall nrm -g
问题解决：
先清空缓存，再重新安装
1. npm cache clearn --force 2. 3. npm install
