{volist name="pc|get_web_menu" id="rs"}
                                        <li class="header__nav-item pos-relative">
                                           <a  href="{$rs.url}" {notempty name="$rs.target"}target="_blank"{/notempty} class="header__nav-link header__nav-link--white header__nav-link--white-hover-white">{$rs.name}<i class="ion-ios-arrow-down"></i></a>
                                            {notempty name="rs.sons"}
											<!--Single Dropdown Menu-->
                                            <ul class="dropdown__menu pos-absolute">
												{volist name="rs.sons" id="vs"}
                                                <li class="dropdown__list">
                                                    <a href="{$vs.url}" {notempty name="$rs.target"}target="_blank"{/notempty} class="dropdown__link">{$vs.name}</a>
                                                </li>
												{/volist}
                                            </ul>
                                            <!--Single Dropdown Menu-->
											{/notempty}
                                        </li> 
										{/volist}

class="ion-ios-arrow-down"

这个怎么没下拉的时候隐藏？