JSFiddle - React, Tailwind, and code Playground

HTML

<button id="show-name-button" name="some-button">CLICK ME</button>

JavaScript

function User()
{
    this.id = 10;
    this.name = "Bob";
    this.logUserName = function() { console.log(this.id + "_" + this.name); };
}

var bob = new User();
var button = document.getElementById("show-name-button");
button.onclick = bob.logUserName;

// Just to show what it should look like
bob.logUserName();