<select id="osel">
<option value='1'>red</option>
<option value='2'>blue</option>
<option value='3'>yellow</option>
</select>
<SCRIPT LANGUAGE="JavaScript">
<!--
    document.getElementById("osel").options[0].style.backgroundColor='red';
    document.getElementById("osel").options[1].style.backgroundColor='blue';
    document.getElementById("osel").options[2].style.backgroundColor='yellow';
//-->
</SCRIPT>

------解决方案--------------------

HTML code


<select id="osel">
<option value='1' style="background-color:red">red</option>
<option value='2' style="background-color:blue">blue</option>
<option value='3' style="background-color:yellow">yellow</option>
</select>