点击空白处下拉列表隐藏，全选，反选，不选
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <script type="text/javascript" src="jquery-1.9.1.min.js"></script> </head> <body> <div /> <a href="" /> <a href="" /> <a href="" class="time">3月29日</a> </li> </ul> </div> </div> </body></html><style>*{padding:0px; margin:0px;}.f_l{float:left;}ul li{list-style:none;}.mail_tit a{ display:block; width:52px; height:28px; background:url(../images/mail_line.jpg) repeat-x; border:1px solid #999; border-radius:3px; color:#555; line-height:28px; text-align:center; float:left; margin-left:14px; *display:inline;}.mail_tit a:hover{ text-decoration:none;}.mail_tit a.write{ color:#fff; background:#1882cf; border:1px solid #0366af;}.mail_tit span{ display:block; width:52px; height:28px; background:url(../images/mail_line.jpg) repeat-x; border:1px solid #999; border-radius:3px; color:#555; line-height:28px; text-align:center; float:left; cursor:pointer;}.mail_tit ul{ display:none; border:1px solid #999; position:absolute; top:30px; left:0px; border-radius:3px; background:#fff;}.mail_tit ul li{ line-height:32px; color:#555; cursor:pointer; width:42px; padding-left:10px;}.mail_tit ul li:hover{ background:#BFBFBF; color:#fff;}.mail_tit{ position:relative; height:30px; padding-bottom:38px; border-bottom:1px solid #a3bdd0;}.mail_con ul li input{ width:14px; height:14px; float:left; margin-top:13px;}.mail_con ul li{ height:40px; line-height:40px; padding-left:10px; border-bottom:1px solid #d5d6d7;}.mail_con ul li:hover{ background:#EFEFEF;}.mail_con ul li a{ color:#222; font-size:14px; height:40px; overflow:hidden; display:block;}.mail_con ul li a:hover{ text-decoration:none;}.mail_con ul li a.email_name{ width:190px; margin-left:40px; *display:inline;}.mail_con ul li a.title{ width:630px; margin-right:10px; *display:inline;}.mail_con ul li a.time{ width:66px; _width:60px;}</style><script> $("#cho").click(function(even){ $(".mail_tit ul.div_d").css("display","block"); }); //点击空白处，下拉框消失 document.onclick=function(e){ var e=e?e:window.event; var tar = e.srcElement||e.target; if(tar.id!="cho"){ if($(tar).attr("class")=="div_d"){ $(".mail_tit ul.div_d").css("display","block") }else{ $(".mail_tit ul.div_d").css("display","none"); } } } $(function(){ //全选 $(".check_all").click(function(){ $(".mail_con ul li input").each(function(){ $(this).attr("checked",true);}); }); //不选 $(".uncheck").click(function(){ $(".mail_con ul li input").each(function(){ $(this).attr("checked",false);}); }); //反选 $(".other_check").click(function(){ $(".mail_con ul li input").each(function(){ if($(this).is(":checked")){ $(this).attr("checked",false); }else{ $(this).attr("checked",true); }}); }); });</script>