小编hah*_*aha的帖子

我想class="value"用jQuery 改变我的选择选项

例

<select name="color_scheme" id="color_scheme">
  <option selected="selected">Default</option>
  <option>Black</option>
  <option>Blue</option>
  <option>Brown</option>
  <option>Green</option>
  <option>Gray</option>
  <option>Lime</option>
  <option>Orange</option>
</select>

<span class="Default"></span>

如果我们选择Black span类就会

<span class="Black"></span>

让我知道

我在MySQL中有4个表加入.例

$select = $db->query("SELECT * 
                        FROM ads 
                       WHERE ad_pic='1' 
                         AND ad_status = '1' 
                    ORDER BY ad_id DESC LIMIT 0,4");

while ($fetch = $db->fetch($select)) {

    $iquery = $db->query("SELECT * 
                            FROM images 
                           WHERE img_ads_id = '" . intval($fetch['ad_id']) . "' 
                             AND img_status = '1' 
                           LIMIT 1");
    $thumb = $db->fetch($iquery);

    $uselect = $db->query("SELECT * 
                             FROM users 
                            WHERE user_id = '".intval($fetch['ad_userid'])."' 
                              AND user_status = '1' 
                            LIMIT 1");
    $ufetch = $db->fetch($uselect);

    $cselect = $db->query("SELECT * 
                             FROM category 
                            WHERE cat_slug = '".safe_func($fetch['ad_category'])."' 
                            LIMIT 1");
    $cfetch = …

我想只使用CSS创建一个箭头

示例你可以看到http://jsfiddle.net/b9Yfc/

上

<div id="arrow"><div id="arrow-inner"></div></div>

我想要arrow-inner进入arrow,结果应该是

如何实现我的目标？