...
<Script Language="JavaScript">
<!--
function CountItem() {
var Count=0;
for(i=0;i<TheSelect.length;i++)
if(TheSelect.options[i].selected==true)
Count++;
alert("共有["+Count+"]项被选中!!!");
}
-->
</Script>
<Body>
<Select Name="TheSelect" Multiple>
<Option>China</Option>
<Option>Japan</Option>
<Option>Korea</Option>
<Option>U.S.A</Option>
</Select>
<Input Type=Button Value="统计" OnClick="CountItem()">
</Body>
</Html>
<Script Language="JavaScript">
<!--
function CountItem() {
var Count=0;
for(i=0;i<TheSelect.length;i++)
if(TheSelect.options[i].selected==true)
Count++;
alert("共有["+Count+"]项被选中!!!");
}
-->
</Script>
<Body>
<Select Name="TheSelect" Multiple>
<Option>China</Option>
<Option>Japan</Option>
<Option>Korea</Option>
<Option>U.S.A</Option>
</Select>
<Input Type=Button Value="统计" OnClick="CountItem()">
</Body>
</Html>
{
var num=0
for(var i=0;i<document.formname.selectname.options.length;i++)
{
if(document.formname.selectname.options[i].selected) num++
}alert(num)
}