datalist如何判断下拉列表中是否选择了输入

<input list="mylist" id="myinput">
<datalist id="mylist">
  <option value="Option 1">
  <option value="Option 2">
  <option value="Option 3">
</datalist>

<script>
  var input = document.getElementById("myinput");
  var datalist = document.getElementById("mylist");
  var selected = false;

  input.addEventListener("input", function() {
    var inputValue = input.value;
    var options = datalist.options;

    for (var i = 0; i < options.length; i++) {
      if (options[i].value === inputValue) {
        selected = true;
        break;
      }
    }

    if (selected) {
      console.log("用户选择了输入");
    } else {
      console.log("用户未选择输入");
    }
  });
</script>