This program includes a folder and a node.js file.
Open cmd and start the node.js service by
nodejs hello.js
Then open index2.html to browse the page.
You need to change line 128 in index2.html
url: 'http://localhost:3000/upload',
Change localhost to your own ip.(Simply you can put your desktop and your phone in the same VLAN by using hotspot).
And then do the same things as local test.