JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="input1" onkeydown="if (event.keyCode == 13) GetParameter('myParam')" value="myParam1=xxx&myParam2=yyyy" />
<button type="button" onclick="getParameters();">Go</button>

JavaScript

function getParameters() {
  var searchString = document.getElementById('input1').value,
      params = searchString.split("&"),
      hash = {};

  if (searchString == "") return {};
  for (var i = 0; i < params.length; i++) {
    var val = params[i].split("=");
    hash[unescape(val[0])] = unescape(val[1]);
  }
  console.log(hash);
  return hash;
}