JSFiddle - React, Tailwind, and code Playground
HTML
<button onclick="ahoj('premenna')">click</button>
<button onclick="cau()">click</button>
<button onclick="cool()">click</button>
<button onclick="cauko()">click</button>JavaScript
var x;
function ahoj(x)
{window[x]=10}
function cau()
{alert(premenna)}
function cool()
{x=100}
function cauko()
{alert(x)}