这里使用jQuery实现的文字展开折叠效果，点击文字后文字内容会完整的显示出来，控制段落来显示文字，不需要的时候，可以再次点击后将内容折叠起来，也就是隐藏了一部分内容。点击查看更多的功能，在很多大网站都有在用，像一些电影简介、产品介绍有时候为了页面的布局效果，常常默认是隐藏了一部分，用户想看的时候可以点击后展开。
运行效果如下图所示：
具体代码如下：
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery文本段落展开和折叠效果</title>
<style>
html,body,p,h2,p{margin: 0;padding: 0;}
html{font: 1em Arial, Helvetica, sans-serif;color: #444;}
a{color: #0087f1;}
p{margin-bottom: 5px;}
#container{margin: 0 auto;width: 600px;}
#container h2{font-size: 20px;color: #0087f1;}
#wrap{position: relative;padding: 10px;overflow: hidden;}
#gradient{width: 100%;height: 35px;background: url() repeat-x;position: absolute;bottom: 0;left: 0;}
#read-more{padding: 5px;border-top: 4px double #ddd;background: #fff;color: #333;}
#read-more a{padding-right: 22px;background: url() no-repeat 100% 50%;font-weight: bold;text-decoration: none;}
#read-more a: hover{color: #000;}
</style>
<script type="text/javascript" src="jquery-1.6.2.min.js?7.1.34"></script>
<script type="text/javascript">
$(function(){
var slideHeight = 75; // px
var defHeight = $('#wrap').height();
if(defHeight >= slideHeight){
$('#wrap').css('height' , slideHeight + 'px');
$('#read-more').append('<a href="#">点击查看更多。</a>');
$('#read-more a').click(function(){
var curHeight = $('#wrap').height();
if(curHeight == slideHeight){
$('#wrap').animate({
height: defHeight
}, "normal");
$('#read-more a').html('点击隐藏');
$('#gradient').fadeOut();
}else{
$('#wrap').animate({
height: slideHeight
}, "normal");
$('#read-more a').html('点击查看更多。');
$('#gradient').fadeIn();
}
return false;
});
}
});
</script>
</head>
<body>
<p id="container">
<h1>jQuery 控制段落文字展开折叠，点击查看更多的功能</h1>
<h2>About Billabong</h2>
<p id="wrap">
<p>
<p>Gordon developed his own stitching technique, which made the garments more durable, cost effective and less labor intensive. He employed machinists, moved the operation into a factory, set up a distribution network and sponsored a team of renowned Australian surfers. The business thrived.</p>
<p>Since those beginnings, Billabong has expanded its product range to include boardsport products such as wetsuits, watches, surfboards, snowboard outerwear and skateboarding apparel.</p>
</p>
<p id="gradient"></p>
</p>
<p id="read-more"></p>
</p>
</body>
</html>
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