<script language=javascript>
function gotourl(){
window.framename.location.href='url?value='+(document.all.select.value);
}
</script><select>
<option onchange=gotourl() value=a>aaa</option>
<option onchange=gotourl() value=b>bbb</option>
</select>
function gotourl(){
window.framename.location.href='url?value='+(document.all.select.value);
}
</script><select>
<option onchange=gotourl() value=a>aaa</option>
<option onchange=gotourl() value=b>bbb</option>
</select>
什么是二级联动?