1, Common way

The most direct and simple way is to set each path to be accessed one by one

var express=require('express');
var app=express();
//Main page
app.get('/',function(req,res){
	res.end('<h1>Admin page</h1>')
})
//Subpage one
app.get('/one',function(req,res){
	res.end('<h1>One page</h1>')
})
//Subpage two
app.get('/two',function(req,res){
	res.end('<h1>Two page</h1>')
})
//Subpage two subpage three below
app.get('/two/three',function(req,res){
	res.end('<h1>Three page</h1>')
})

var server=app.listen(3000)

2, Encapsulate each path and mount it according to requirements, which can be understood as componentization

var express=require('express');
var app=express();
var admin=express();
var one=express();
var two=express();
var three=express();
var four=express();

admin.get('/',function(req,res){
	res.send('Admin page')
})

one.get('/',function(req,res){
	res.send('One page')
})

two.get('/',function(req,res){
	res.send('Two page')
})

three.get('/three',function(req,res){
	res.send('Three page')
})
four.get('/',function(req,res){
	res.send('Four page')
})

app.use('/',admin);//Access localhost:3000 / output Admin page
app.use('/one',one);//Visit localhost:3000/one to output One page
app.use('/two',two);//Visit localhost:3000/two to output two pages

app.use(['/one','/two'],three);//Visit localhost:3000/one/three or localhost:3000/two/three to output Three page
one.use('/',four)//Visit localhost:3000/one/four to output Four page

var server=app.listen(3000)

There are two ways to set sub routes:

1) Directly through the named route setting, i.e. setting multi-layer sub paths in the outermost path

Such as app,use('/one/two/three/...',router)

2) Set the next level path for the encapsulated self route

For example, app. Use ('/ parent', router [parent);

router_parent.use('/son,router_son)