Как реализовать смену полей

var button = document.getElementById('switch'); 
var input1 = document.getElementById('input1'); 
var input2 = document.getElementById('input2'); 
 
button.addEventListener('click', function() { 
  var input1Val = input1.value; 
  var input2Val = input2.value; 
   
  input1.value = input2Val; 
  input2.value = input1Val; 
});

<div class="field"> 
  <input type="text" id="input1" class="field__input"> 
</div> 
<button id="switch">o</button> 
<div class="field"> 
  <input type="text" id="input2" class="field__input"> 
</div>