清空form表单选择项：
<div class="screen-window"><form action="/Index/index" method="post" class="form-horizontal group-border hover-stripped"><select class="control" name="clients_belong" ><option value="">请选择</option><option value="1">你好</option></select><input type="text" name="timea" value=''><input type="text" name="timeb" value=''><button type="submit">确认提交</button><button id="qingkong" type="button">清空筛选</button></form></div><script src="/Public/js/jquery-1.8.3.min.js" type="text/javascript" charset="utf-8"></script><script type="text/javascript">$("#qingkong").click(function(){$(".screen-window form input").each(function(){$(this).val('');});$(".screen-window form select").each(function(){$(this).val('');});})</script>
