如何将两个参数传递给select标记中的onchange处理程序？

<select onchange="myFunction(param1, param2)">
  ...
</select>

<select onchange="myFunction(this)">
  <option value="param1" data-param2="value2">Option 1</option>
  <option value="param3" data-param4="value4">Option 2</option>
  ...
</select>

function myFunction(selectElement) {
  var param1 = selectElement.value;
  var param2 = selectElement.options[selectElement.selectedIndex].getAttribute('data-param2');
  ...
}

<select onchange="myFunction(this)">
  <option value="value1" custom-param2="value2">Option 1</option>
  <option value="value3" custom-param2="value4">Option 2</option>
  ...
</select>

function myFunction(selectElement) {
  var param1 = selectElement.value;
  var param2 = selectElement.options[selectElement.selectedIndex].getAttribute('custom-param2');
  ...
}