接上：http://www.cnblogs.com/akou/p/4461557.html
代码：
13.获取选中的下拉框
<!DOCTYPE>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../scripts/jquery.js" type="text/javascript"></script>
</head>
<body>
<input type="button" id="send1" value="get" onclick="getObj()"/>
<select id="someElement">
<option>一班</option>
<option>二班</option>
<option>三班</option>
</select>
<script>
function getObj(){
var $obj = $('#someElement').find('option:selected');
alert( $obj.val() );
}
</script>
</body>
</html>
14.获取选中的下拉框
<!DOCTYPE>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../scripts/jquery.js" type="text/javascript"></script>
</head>
<body>
<button >toggle</button>
<input type="checkbox" value="1" />篮球
<input type="checkbox" value="2" />足球
<input type="checkbox" value="3" />羽毛球
<script>
var tog = false;
$('button').click(function(){
$("input[type=checkbox]").attr("checked",!tog);
tog = !tog;
});
</script>
</body>
</html>
15.使用siblings()来选择同辈元素
<!DOCTYPE>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../scripts/jquery.js" type="text/javascript"></script>
<style>
li.active{
font-size:20px;
color:red;
}
</style>
</head>
<body>
<ul id="nav">
<li>Google</li>
<li>百 度</li>
<li>新浪</li>
</ul>
<script>
/* 不这样做
$('#nav li').click(function(){
$('#nav li').removeClass('active');
$(this).addClass('active');
});
*/
//替代做法是
$('#nav li').click(function(){
$(this).addClass('active')
.siblings().removeClass('active');
});
</script>
</body>
</html>
16.从元素中除去HTML
<!DOCTYPE>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../scripts/jquery.js" type="text/javascript"></script>
</head>
<body>
<div>
<p>锋利的<a href="#nogo">jQuery</a></p>
</div>
<script>
(function($) {
$.fn.stripHtml = function() {
var regexp = /<("[^"]*"|'[^']*'|[^'">])*>/gi;
this.each(function() {
$(this).html( $(this).html().replace(regexp,'') );
});
return $(this);
}
})(jQuery);
//用法：
$('div').stripHtml();
</script>
</body>
</html>
这些只是一部分，全部的代码（上）面有链接。