<input type="radio" name="option" value="option1" class="option"> Option 1
<input type="radio" name="option" value="option2" class="option"> Option 2
<input type="radio" name="option" value="option3" class="option"> Option 3
<button onclick="getSelectedOptions()">Get Selected Options</button>

function getSelectedOptions() {
  var options = document.getElementsByClassName("option");
  var selectedOptions = [];

  for (var i = 0; i < options.length; i++) {
    if (options[i].checked) {
      selectedOptions.push(options[i].value);
    }
  }

  console.log(selectedOptions);
}