JSFiddle - React, Tailwind, and code Playground
HTML
<span>One: </span><input type='text' id='ax' value='4' size='6'/>
<br/>
<span>Two: </span><input type='text' id='bx' value='2.5' size='6'/>
<br/><br/>
<button onclick='mytest(ax.value, bx.value);'>Go Now</button>JavaScript
function mytest(a, b) {
var x = [0,1,2,3,4,5];
var y = [100,120,140,160,180,200];
var myval = parseFloat(a) - x[3];
alert(myval);
}