Error: EEXIST, mkdir 'C:\Users\gc57\AppData\Roaming\npm' --nodejs出错原因

D:\programme\nodejs>npm install -g express-generator@4
Error: EEXIST, mkdir 'C:\Users\gc57\AppData\Roaming\npm'


D:\programme\nodejs>npm -v
1.4.23

D:\programme\nodejs>npm install -g express-generator@4
Error: EEXIST, mkdir 'C:\Users\gc57\AppData\Roaming\npm'


D:\programme\nodejs>npm install -g express
Error: EEXIST, mkdir 'C:\Users\gc57\AppData\Roaming\npm'


D:\programme\nodejs>npm install  express
[email protected] node_modules\express
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected], [email protected])
└── [email protected] ([email protected], [email protected], [email protected])

D:\programme\nodejs>npm config get prefix
C:\Users\gc57\AppData\Roaming\npm

D:\programme\nodejs>npm config set prefix "D:\programme\nodejsexpress

D:\programme\nodejs>npm install -g express
[email protected] D:\programme\nodejsexpress\node_modules\express
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected]
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected], [email protected], [email protected])
├── [email protected] ([email protected])
├── [email protected] ([email protected], [email protected])
└── [email protected] ([email protected])

D:\programme\nodejs>D:\programme\nodejs>npm install -g express-gene