root@debian10:~# npm install -g express
+ express@4.17.1
updated 1 package in 20.666s
root@debian10:~# express -V
bash: express：未找到命令
root@debian10:~# npm install -g express-generator
npm WARN deprecated mkdirp@0.5.1: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)
/root/.npm-global/bin/express -> /root/.npm-global/lib/node_modules/express-generator/bin/express-cli.js
+ express-generator@4.16.1
updated 1 package in 4.095s
root@debian10:~# express -V
bash: express：未找到命令
root@debian10:~#