JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="val1" value="10" />
<input type="text" id="val2" value="20" />
<a href="#" onclick="myfuncion(val1.value, val2.value);">Click</a>

JavaScript

function myfuncion(val1, val2)
{
    alert(val1 + " : " + val2);
}