javascript - Multiple files on a socket io file -

how can handle multiple file connections single socket io file.

for example have these 3 pages: index1.html, index2.html , index3.html.

how can connect of these 3 files single socket io file?

when connected on index1.html , when click link index1.html redirect me index2.html want show in console still connected.

here code 1 file:

app.get('/', function(req, res){     res.sendfile(__dirname + '/index.html'); });