另一个下拉列表 - 在线编辑器

          <form>
  选择一个数字:<br>
  <select id="no">
  <option>0</option>
  <option>1</option>
  <option>2</option>
  <option>3</option>
  <option>4</option>
  <option>5</option>
  <option>6</option>
  <option>7</option>
  <option>8</option>
  <option>9</option>
</select>
  <input type="button" onclick="myFunction()" value="-->">
  <input type="text" id="result" size="20">
</form>
<script>
  function myFunction() {
    var no = document.getElementById("no");
    var option = no.options[no.selectedIndex].text;
    var txt = document.getElementById("result").value;
    txt = txt + option;
    document.getElementById("result").value = txt;
  }
</script>
        