I've tried adding an onclick function to my ejs button but it's not calling the function in my index.js. here is my ejs button in the views folder

<button onclick="test();">test</button>

here is my index.js

const express = require('express');
const app = express();



const ejs = require('ejs'); //to connect to ejs files
const path = require('path'); //to use redirect and render
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs'); //specify engine



app.get('/', (req, res) => {        
  res.render("index")
})

function test() //here is the function I want called.
  {
    console.log("works")
  }


app.listen(3000)

How do I call a function from ejs? If it is not possible, then how do you change varibles? ex. pg+=1. So the pg in the link increases by 1.