gyp ERR! configure error gyp ERR! stack Error: EACCES: permission denied,.....build解决方案

gyp ERR! configure error 

gyp ERR! stack Error: EACCES: permission denied, mkdir '/Users/zhang/Documents/data_insight_yinzhou/data_insight_yinzhou/node_modules/node-sass/build'

gyp ERR! System Darwin 17.6.0

gyp ERR! command "/usr/local/bin/node" "/Users/zhang/Documents/data_insight_yinzhou/data_insight_yinzhou/node_modules/node-gyp/bin/node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="

gyp ERR! cwd /Users/zhang/Documents/data_insight_yinzhou/data_insight_yinzhou/node_modules/node-sass

gyp ERR! node -v v10.1.0

gyp ERR! node-gyp -v v3.6.2

gyp ERR! not ok 

查看资料发现，可能需要增加--unsafe-perm，即

sudo npm install --unsafe-perm

结果成功了，但是不知道为什么。