$(document).ready(function(){
var h3=$(".accordion h3");
$(".accordion h3:eq(0)").addClass("active");//1.首先獲取第一個H3標簽添加class；
$(".accordion p:gt(0)").hide();//在獲取除了第一個p標簽以外的所有標簽都隱藏；
h3.click(function(){
$(this).next("p").slideToggle("slow")//查找下一個p標簽添加動畫，并查找它的兄弟節點是否顯示，如果顯示就隱藏
.siblings("p:visible").fadeOut("slow");
$(this).toggleClass("active");//給H3標簽添加class（如果有就不添加 沒有就添加），查找兄弟節點移除class
$(this).siblings("h3").removeClass("active");
});
});

body {
margin: 10px auto;
width: 570px;
font: 75%/120% Arial, Helvetica, sans-serif;
}
.accordion {
width: 480px;
border-bottom: solid 1px #c4c4c4;
}
.accordion h3 {
background: #e9e7e7 url(images/arrow-square.gif) no-repeat right -51px;
padding: 7px 15px;
margin: 0;
font: bold 120%/100% Arial, Helvetica, sans-serif;
border: solid 1px #c4c4c4;
border-bottom: none;
cursor: pointer;
}
.accordion h3:hover {
background-color: #e3e2e2;
}
.accordion h3.active {
background-position: right 5px;
}
.accordion p {
background: #f7f7f7;
margin: 0;
padding: 10px 15px 20px;
border-left: solid 1px #c4c4c4;
border-right: solid 1px #c4c4c4;
}

<div class="accordion">
<h3>Question One Sample Text</h3>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi malesuada, ante at feugiat tincidunt, enim massa gravida metus, commodo lacinia massa diam vel eros. Proin eget urna. Nunc fringilla neque vitae odio. Vivamus vitae ligula.</p>
<h3>This is Question Two</h3>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi malesuada, ante at feugiat tincidunt, enim massa gravida metus, commodo lacinia massa diam vel eros. Proin eget urna. Nunc fringilla neque vitae odio. Vivamus vitae ligula.</p>
<h3>Another Questio here</h3>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi malesuada, ante at feugiat tincidunt, enim massa gravida metus, commodo lacinia massa diam vel eros. Proin eget urna. Nunc fringilla neque vitae odio. Vivamus vitae ligula.</p>
<h3>Sample heading</h3>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi malesuada, ante at feugiat tincidunt, enim massa gravida metus, commodo lacinia massa diam vel eros. Proin eget urna. Nunc fringilla neque vitae odio. Vivamus vitae ligula.</p>
<h3>Sample Question Heading</h3>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Morbi malesuada, ante at feugiat tincidunt, enim massa gravida metus, commodo lacinia massa diam vel eros. Proin eget urna. Nunc fringilla neque vitae odio. Vivamus vitae ligula.</p>
</div>