Source
<HTML>
<BODY>
<SCRIPT Language="JavaScript">
function DisplayProperties() {
      n = document.Form1.City.length;
      i = document.Form1.City.selectedIndex;
      c1 = document.Form1.City.options[i].defaultSelected;
      c2 = document.Form1.City.options[i].selected;
      c3 = document.Form1.City.options[i].value;
      c4 = document.Form1.City.options[i].text;
      window.alert( "n=" + n + ", i=" + i + ", defaultSelected="+c1 + ", selected=" + c2 + ", value=" + c3 + ", text=" + c4);
   }
</SCRIPT>

<FORM Name=Form1>

<SELECT Name=City>
    <OPTION Value=Taipei>台北市
    <OPTION Value=Taichung>台中市
    <OPTION Value=Tainan>台南市
    <OPTION Value=Kaohsiung Selected>高雄市
</SELECT><P>
<INPUT Type=Button Value="顯示屬性" OnClick="DisplayProperties();">
</FORM>
</BODY>
</HTML>