How to link button with js variable

Question

i want to make a button that give a print of a js variable string

Answer 1

A print? Like in the console or onto your site?

Answer 2

create a p element somewhere with display: none; and button should have onclick="functionName()"
after that js code should look like this:

function functionName(){
var t = document.getElementById("yourId");
var text = "your text";

t.style.display = block;
t.innerHTML = text;
}