电脑中之前安装过Vue2的vue/cli，今天尝试安装Vue3的@vue/cli便发生以下报错：
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated @hapi/joi@15.1.1: joi is leaving the @hapi organization and moving back to 'joi' (https://github.com/sideway/joi/issues/2411)
npm WARN deprecated @hapi/bourne@1.3.2: This version has been deprecated and is no longer supported or maintained
npm WARN deprecated @hapi/topo@3.1.6: This version has been deprecated and is no longer supported or maintained
npm WARN deprecated @hapi/address@2.1.4: Moved to 'npm install @sideway/address'
npm WARN deprecated @hapi/hoek@8.5.1: This version has been deprecated and is no longer supported or maintained
npm WARN deprecated har-validator@5.1.5: this
npm ERR! code EEXIST
npm ERR! syscall symlink
npm ERR! path ../lib/node_modules/@vue/cli/bin/vue.js
npm ERR! dest /usr/local/bin/vue
npm ERR! errno -17
npm ERR! EEXIST: file already exists, symlink '../lib/node_modules/@vue/cli/bin/vue.js' -> '/usr/local/bin/vue'
npm ERR! File exists: /usr/local/bin/vue
npm ERR! Remove the existing file and try again, or run npm
npm ERR! with --force to overwrite files recklessly.
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/shuaitao/.npm/_logs/2021-04-13T15_55_21_717Z-debug.log
仔细看了以下错误，原因是/usr/local/bin/vue文件已经存在，执行删除命令后再执行安装命令即可：
sudo rm -rf /usr/local/bin/vue
sudo npm install -g @vue/cli
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