jQuery UI 实现图片循环显示，常用于网站首页banner广告切换

http://www.runoob.com/try/try.php?filename=jqueryui-example-position-cycler

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery UI 定位（Position） - 图像循环</title>
  <link rel="stylesheet" href="//apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
  <script src="//apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="//apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
  <link rel="stylesheet" href="jqueryui/style.css">
  <style>
  body {
    margin: 0;
  }
  #container {
    overflow: hidden;
    position: relative;
    height: 400px;
  }
 
  img {
    position: absolute;
  }
  </style>
  <script>
  $(function() {
    // 重构部件，去除这些插件方法
    $.fn.left = function( using ) {
      return this.position({
        my: "right middle",
        at: "left+25 middle",
        of: "#container",
        collision: "none",
        using: using
      });
    };
    $.fn.right = function( using ) {
      return this.position({
        my: "left middle",
        at: "right-25 middle",
        of: "#container",
        collision: "none",
        using: using
      });
    };
    $.fn.center = function( using ) {
      return this.position({
        my: "center middle",
        at: "center middle",
        of: "#container",
        using: using
      });
    };
 
    $( "img:eq(0)" ).left();
    $( "img:eq(1)" ).center();
    $( "img:eq(2)" ).right();
 
    function animate( to ) {
      $( this ).stop( true, false ).animate( to );
    }
    function next( event ) {
      event.preventDefault();
      $( "img:eq(2)" ).center( animate );
      $( "img:eq(1)" ).left( animate );
      $( "img:eq(0)" ).right().appendTo( "#container" );
    }
    function previous( event ) {
      event.preventDefault();
      $( "img:eq(0)" ).center( animate );
      $( "img:eq(1)" ).right( animate );
      $( "img:eq(2)" ).left().prependTo( "#container" );
    }
    $( "#previous" ).click( previous );
    $( "#next" ).click( next );
 
    $( "img" ).click(function( event ) {
      $( "img" ).index( this ) === 0 ? previous( event ) : next( event );
    });
 
    $( window ).resize(function() {
      $( "img:eq(0)" ).left( animate );
      $( "img:eq(1)" ).center( animate );
      $( "img:eq(2)" ).right( animate );
    });
  });
  </script>
</head>
<body>
 
<div id="container">
  <img src="/wp-content/uploads/2014/03/earth.jpg" width="458" height="308" alt="earth">
  <img src="/wp-content/uploads/2014/03/flight.jpg" width="512" height="307" alt="flight">
  <img src="/wp-content/uploads/2014/03/rocket.jpg" width="300" height="353" alt="rocket">
 
  <a id="previous" href="#">上一个</a>
  <a id="next" href="#">下一个</a>
</div>
 
 
</body>
</html>