<select name="ditem" multiple="multiple" size="10" id="ditem">
<option value='1'>test1</option>
<option value='2'>test2</option>
<option value='3'>test3</option>
<option value='4'>test4</option>
<option value='5'>test5</option>
<option value='6'>test6</option>
</select>
<script>
for (var i=0;i<$("#sitem option").length;i++)
{
//怎么alert所有的value,大牛帮帮忙
}</script>
<option value='1'>test1</option>
<option value='2'>test2</option>
<option value='3'>test3</option>
<option value='4'>test4</option>
<option value='5'>test5</option>
<option value='6'>test6</option>
</select>
<input type=button onclick="getValus()" value="获取选中的值"/>
<script>
function getValus(){
var slc = document.getElementById("ditem");
var r=[];
for (var i=0;i<slc.options.length;i++)
{
if(slc.options[i].selected){
r.push(slc.options[i].value);
}
}
alert(r.join(","));
}
</script>