Edit in JSFiddle

function getRange() {
  var lowEnd = document.getElementById("lowEnd").value;
  var highEnd = document.getElementById("highEnd").value;
  var range = [];
  for (var i = lowEnd; i <= highEnd; i++) {
    range.push(i);
  }
  document.getElementById("result").innerHTML = range;
}

<input id="lowEnd" />
<input id="highEnd" />
<button onclick="getRange()">Submit</button>
<div id="result"></div>