JSFiddle - React, Tailwind, and code Playground
HTML
<button id="eins">click</button>
<p id="info"></p>
JavaScript
var v;
$("#eins").click(function(){
v = (v ? 0 : 1);
$("#info").html(v);
});
<button id="eins">click</button>
<p id="info"></p>
var v;
$("#eins").click(function(){
v = (v ? 0 : 1);
$("#info").html(v);
});