Configure NPM

（1） stay NodeJs Set up under the "node_global" And "node_cache" Two folders  

（2） Enter the following command to configure npm The storage path of the global module and cache The path of

npm config set prefix + node_global The path of

npm config set cache + node_cache The path of

（3） Configure system variables , newly build NODE_PATH Post input node_modules The path of

（4） Try to install by entering the following command from the command line express（ notes ：“-g” This parameter means to load to global Under the table of contents , That is to say, the settings mentioned above “E:\Node.js\node_global” Inside ）

npm install express -g

（5） You can see express We downloaded it to node_global Under the node_modules Next

（6） Enter at the command line node Enter edit mode , Enter the following code to test whether the module can be loaded normally

require('express')

success , You can see the following output

If something goes wrong , Check NODE_PATH Path or express Whether the path of is written correctly