近期在macos开发环境下使用npm，经常会出现无法mkdir，permission denied的问题，在windows下并没有遇到这种情况。
经查询需要在指令前使用sudo指令，例如：npm install your_module 改为 sudo npm install your_module
下方是一个报错信息。
npm?ERR!?path?/Users/niceyoo/.npm/_cacache/index-v5/92/fc
npm?ERR!?code?EACCES
npm?ERR!?errno?-13
npm?ERR!?syscall?mkdir
npm?ERR!?Error:?EACCES:?permission?denied,?mkdir?‘/Users/niceyoo/.npm/_cacache/index-v5/92/fc‘
npm?ERR!??{?[Error:?EACCES:?permission?denied,?mkdir?‘/Users/niceyoo/.npm/_cacache/index-v5/92/fc‘]
npm?ERR!???cause:
npm?ERR!????{?Error:?EACCES:?permission?denied,?mkdir?‘/Users/niceyoo/.npm/_cacache/index-v5/92/fc‘
npm?ERR!??????errno:?-13,
npm?ERR!??????code:?‘EACCES‘,
npm?ERR!??????syscall:?‘mkdir‘,
npm?ERR!??????path:?‘/Users/niceyoo/.npm/_cacache/index-v5/92/fc‘?},
npm?ERR!???isOperational:?true,
npm?ERR!???stack:
npm?ERR!????‘Error:?EACCES:?permission?denied,?mkdir?‘/Users/niceyoo/.npm/_cacache/index-v5/92/fc‘‘,
npm?ERR!???errno:?-13,
npm?ERR!???code:?‘EACCES‘,
npm?ERR!???syscall:?‘mkdir‘,
npm?ERR!???path:?‘/Users/niceyoo/.npm/_cacache/index-v5/92/fc‘?}
npm?ERR!?
npm?ERR!?The?operation?was?rejected?by?your?operating?system.
npm?ERR!?It?is?likely?you?do?not?have?the?permissions?to?access?this?file?as?the?current?user
npm?ERR!?
npm?ERR!?If?you?believe?this?might?be?a?permissions?issue,?please?double-check?the
npm?ERR!?permissions?of?the?file?and?its?containing?directories,?or?try?running
npm?ERR!?the?command?again?as?root/Administrator?(though?this?is?not?recommended).
macos是基于Linux的，所以本身sudo就是Linux下的指令，sudo命令以系统管理者的身份执行指令，依次，通过sudo所执行的指令就好像是root亲自执行。
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