純CSS彈出層效果

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><title>純CSS彈出層效果</title><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"></head><style type="text/css">.f_l {float:left;}.f_r {float:right;}.city {height:60px;padding-left:10px;text-align:center;}.city_now {width:60px;padding-top:20px;color:#595756;font-size:16px;letter-spacing:3px;font-weight:bold;}.city_box {text-align:center;}.city_box span {vertical-align:bottom;}.city_nav {text-align:center;height:18px;line-height:18px;color:#333;cursor:pointer;overflow:hidden;display:inline-block;}.city_hover {color:#f25000;height:18px;line-height:18px;overflow:hidden;}.city_link {background:#FFFFFF;border:#f25000 2px solid;width:305px;display:none;z-index:9999;}.city_hovers {display:block;position:absolute;}.city_links {width:60px;margin-right:1px;height:30px;line-height:30px;font-size:13px;text-align:center;background:#f6f6f6;vertical-align:top;margin-bottom:1px;display:inline-block;}.city_show {background:#ccc;height:18px;line-height:18px;padding:5px;cursor:pointer;}</style><body><div   id="lhzzvpd"   class="city f_l"><div   id="dtnzbbr"   class="city_now">北京</div><div   id="ddztvlj"   class="city_swich"><span id="djvhtzp"    class="city_nav" id="city_nav" onclick="this.className='city_nav city_hover';document.getElementById('city_link').className='city_link city_hovers'">[切換城市]</SPAN>
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