第一步：参考：Mac 安装 vue3 环境_mac 安装vue-CSDN博客
第二步：报错执行：sudo npm install -g @vue/cli 报错：npm error code EEXIST
npm error path /usr/local/bin/vue
npm error EEXIST: file already exists
npm error File exists: /usr/local/bin/vue
npm error Remove the existing file and try again, or run npm
npm error with --force to overwrite files recklessly.
npm error A complete log of this run can be found in: /Users/kevnwang/.npm/_logs/2024-08-26T08_17_51_227Z-debug-0.log
解决方法：
在终端中执行以下命令：sudo rm /usr/local/bin/vue
第三步：执行：vue create my-project 报错如下：
npm error code EACCES
npm error syscall open
npm error path /Users/kevnwang/.npm/_cacache/index-v5/15/40/0ebcbd9ca76d672114d6e06dd5204999f3fd585e151ee938026539f7b335
npm error errno EACCES
npm error
npm error Your cache folder contains root-owned files, due to a bug in
npm error previous versions of npm which has since been addressed.
npm error
npm error To permanently fix this problem, please run:
npm error sudo chown -R 501:20 "/Users/kevnwang/.npm"
npm error A complete log of this run can be found in: /Users/kevnwang/.npm/_logs/2024-08-26T08_34_12_573Z-debug-0.log
ERROR Error: command failed: npm install --loglevel error --legacy-peer-deps
Error: command failed: npm install --loglevel error --legacy-peer-deps
at ChildProcess.<anonymous> (/usr/local/lib/node_modules/@vue/cli/lib/util/executeCommand.js:138:16)
at ChildProcess.emit (node:events:520:28)
at maybeClose (node:internal/child_process:1105:16)
at ChildProcess._handle.onexit (node:internal/child_process:305:5)
解决方法：
执行：sudo chown -R 501:20 "/Users/kevnwang/.npm"