<html lang="en">
<head>
<meta charset="utf-8">
<title>淡入淡出特效（Fade Effect）演示</title>
<link rel="stylesheet" href="https://libs.baidu.com/jqueryui/1.10.4/css/jquery-ui.min.css">
<style>
#toggle {
width: 100px;
height: 100px;
background: #ccc;
}
</style>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script src="https://libs.baidu.com/jqueryui/1.10.4/jquery-ui.min.js"></script>
</head>
<body>
<p>点击任意地方进行切换。</p>
<div id="toggle"></div>
<script>
$( document ).click(function() {
$( "#toggle" ).toggle( "fade" );
});
</script>
</body>
</html>