如何使用jquery实现文字上下滚动效果
实现文字上下滚动是经常用到的js效果，这里介绍一种上下渐隐渐出的文字展现效果！
<!DOCTYPE>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>文字滚动</title>
<style type="text/css">
#sidebar{width:200px; height;500px; overflow:hidden; margin:0 auto; background:#f00; color:#fff;}
#marquee{width:200px; margin:0;padding:0;}
#marquee li{width:200px;height:20px; line-height:20px;}
ul li{list-style:none;}
</style>
</head>
<body>
<div id="sidebar">
<ul id="marquee" class="marquee spy">
<li>11111111111111111111111111111</li>
<li>22222222222222222222222222222</li>
<li>33333333333333333333333333333</li>
<li>44444444444444444444444444444</li>
<li>55555555555555555555555555555</li>
<li>asdsdssssssssssssssssssdddddd</li>
<li>ggggggggggggggggggggggggggggg</li>
<li>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</li>
<li>11111111111111111111111111111</li>
<li>22222222222222222222222222222</li>
<li>33333333333333333333333333333</li>
<li>44444444444444444444444444444</li>
<li>55555555555555555555555555555</li>
<li>asdsdssssssssssssssssssdddddd</li>
<li>ggggggggggggggggggggggggggggg</li>
<li>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</li>
</ul>
</div>
</body>
</html>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
$(function () {
$('ul.spy').simpleSpy();
});
(function ($) {
$.fn.simpleSpy = function (limit, interval) {
limit = limit || 12;//展示数量
interval = interval || 4000;
return this.each(function () {
var $list = $(this),
items = [],
currentItem = limit,
total = 0,
height = $list.find('> li:first').height();
$list.find('> li').each(function () {
items.push('<li>' + $(this).html() + '</li>');
});
total = items.length;
$list.wrap('<div class="spyWrapper" />').parent().css({ height : height * limit });
$list.find('> li').filter(':gt(' + (limit - 1) + ')').remove();
function spy() {
var $insert = $(items[currentItem]).css({
height : 0,
opacity : 0,
display : 'none'
}).prependTo($list);
$list.find('> li:last').animate({ opacity : 0}, 1000, function () {
$insert.animate({ height : height }, 1000).animate({ opacity : 1 }, 1000);
$(this).remove();
});
currentItem++;
if (currentItem >= total) {
currentItem = 0;
}
setTimeout(spy, interval)
}
spy();
});
};
})(jQuery);
</script>希望本文所述对大家学习jquery有所帮助。
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