guys take a look at it for me, thanks to
1, an empty project generated by express, normal process cnpm I
2, I used supervisor to monitor, so I wrote a command in package.json "dev": "supervisor-I. / node_modules-x babel-node. / bin/www"

but after modifying the code, the monitor repeatedly prompts me to occupy the port, as shown in figure

Thank you for taking a look at it for me.

(it is normal after removing-x babel-node from the command line)