live reload on a pc? code example

Example: what is live reload

livereload.js 
is opensource implemention of client side of the livereload protocol. 
The client connects to a LiveReload server 
via web sockets and listens for incoming change notifications. 
When a CSS or an image file is modified, it is live-refreshed 
without reloading the page. 
When any other file is modified, the page is reloaded.