bash: npm: command not found 和 checkPermissions Missing write access to /usr/local/lib/node_modules

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1. bash: npm: command not found
   解决方法：
   官网下载最新本
   https://nodejs.org/en/
2. checkPermissions Missing write access to /usr/local/lib/node_modules
   解决方法：
   1. 修改npm包所安装目录的权限：sudo chown -R $USER /usr/local 回车输入密码
   2. 查看目录是否已切换权限：ls -l /usr/local
   3. npm全局包安装：npm install webpack -g