installation process of NODEJS express4.x

Recently looking at the development of Nodejs, following the steps in "node. JS Starter Classic", some problems were found during the installation of Express.

First: When using the command "NPM Install-g Express", follow the instructions, you can directly invoke the Express command, but found that the prompt "does not support this command", because the new version of the installation adds a step:

NPM install-g express-generatorexpress

Second: According to the method described in the book, the way to start the page is: node app.js, but will find that it does not work. The command should be used; NPM start

installation process of NODEJS express4.x