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npm install 失败问题总结：

1、gyp ERR! configure error

解决:

npm install –unsafe-perm

npm 出于安全考虑不支持以 root 用户运行，即使你用 root 用户身份运行了，npm 会自动转成一个叫 nobody 的用户来运行，而这个用户几乎没有任何权限。这样的话如果你脚本里有一些需要权限的操作，比如写文件（尤其是写 /root/.node-gyp），就会崩掉了。

为了避免这种情况，要么按照 npm 的规矩来，专门建一个用于运行 npm 的高权限用户；要么加

–unsafe-perm

参数，这样就不会切换到 nobody 上，运行时是哪个用户就是哪个用户，即使是 root

2、node-sass安装失败，提示如下：

gyp verb check python checking for Python executable "python" in the PATH
gyp verb `which` succeeded python D:\Program Files\Python38\python.EXE
gyp ERR! configure error
gyp ERR! stack Error: Command failed: D:\Program Files\Python38\python.EXE -c import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack   File "<string>", line 1
gyp ERR! stack     import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack                       ^
gyp ERR! stack SyntaxError: invalid syntax
gyp ERR! stack
gyp ERR! stack     at ChildProcess.exithandler (child_process.js:303:12)
gyp ERR! stack     at ChildProcess.emit (events.js:310:20)
gyp ERR! stack     at maybeClose (internal/child_process.js:1021:16)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:286:5)
gyp ERR! System Windows_NT 10.0.18362
gyp ERR! command "D:\\Program Files\\nodejs\\node.exe" "E:\\JDProject\\renren-fast-vue\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd E:\JDProject\renren-fast-vue\node_modules\node-sass
gyp ERR! node -v v12.16.3
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
Build failed with error code: 1
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! node-sass@4.9.0 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass@4.9.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\HP\AppData\Roaming\npm-cache\_logs\2020-05-23T06_27_44_952Z-debug.log

解决：

npm config set sass_binary_site=https://npm.taobao.org/mirrors/node-sass

之后再次

npm install

npm run dev