JSFiddle - React, Tailwind, and code Playground

HTML

<input name="test1" value="1.77" type="hidden" />
<input name="test2" value="1.23" type="hidden" />

JavaScript

var a = parseFloat($("input[name='test1']").val());
var b = parseFloat($("input[name='test2']").val());
alert( a + b );