这是一个使用jQuery插件实现的伸缩效果，在网页上，单击单选按钮，也就是Radio元素后，所属的对应内容向下拉出，伸展开来，平时是不显示的，可用在发票打印快递单查询等场合。
运行效果如下图所示：
具体代码如下：
<!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>下拉伸缩效果</title> <script type="text/javascript" src="https://www.jb51.net/jquery-1.6.2.min.js"></script> <style type="text/css"> body,ul,li,h1,h2,h3{margin:0px; padding:0;} li{list-style:none;} .m-collapsed, .m-expanded{margin-bottom: 20px;} .m-collapsed div{display: none;} .m-collapsed h3{background-color: #F1F1F1; color: #FF3399; cursor: pointer; font-size: 16px; height: 30px; line-height: 30px; padding-left: 20px;} .m-collapsed h3 span{color: #333333; font-size: 14px; font-weight: normal; padding-left: 20px;} .m-expanded{border: 1px solid #F691C3; padding: 10px 20px 20px;} .m-expanded h3{color: #FF3399; cursor: pointer; font-size: 16px; margin-bottom: 20px;} .m-expanded h3 span{display: none;} </style> <script type="text/javascript"> $(document).ready(function(){ var $tree_li = $("ul.tree li > h3") $tree_li.click(function(){ var index = $tree_li.index(this); var $div = $("ul.tree li h3").eq(index).next("div"); if($div.is(":visible")){ $(this).parent().attr("class","m-collapsed"); $div.hide(); $(this).find("input[type='checkbox']").removeAttr("checked","checked"); }else{ $(this).parent().attr("class","m-expanded"); $div.show(); $(this).find("input[type='checkbox']").attr("checked","checked"); } return false; }) }) </script> </head> <body> <h1>下拉伸缩效果带复选框</h1> <div > <ul> <li> <h3><input type="checkbox" value="" /> 索要发票</h3> <div> <div> <div> <span>发票抬头：</span> <span> <input type="radio" checked="checked" value="P"> <label for="title-p">个人</label> </span> <span> <input type="radio" value="C"> <label for="title-g">单位</label> </span> </div> <div> <div> <label for="g-name">单位名称：</label> <input type="text" maxlength="50"> <span></span> </div> </div> <div> <label for="receipt-cata">发票内容：</label> <select> <option value="">明细</option> <option value="FS">服装服饰</option> <option value="BG">办公用品</option> </select> </div> <div> <input type="submit" value="提交"> </div> </div> </div> </li> </ul> </div> </body> </html>