JSFiddle - React, Tailwind, and code Playground

JavaScript

function TestObj(Arg1, Arg2) {
  var arg3 = 567;

  this.Method = function() {
    console.log(Arg1, Arg2, arg3);
    alert(Arg1);
    alert(Arg2);
    alert(arg3);
  }
}

var o = new TestObj('Hello', 55);

o.Method();