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百度经验滑动效果

 效果预览:

 

代码:

 1 <!doctype html> 2 <html> 3 <head> 4 <meta charset="utf-8"> 5 <title>无标题文档</title> 6 <style> 7 *{margin:0;padding:0;} 8 .box{margin-left:50px;} 9 li{ list-style:none;}10 .box ul li{width:800px;height:344px;border-left:1px dotted #666666;position:relative;}11 .box2{height:500px;}12 .box3{height:2000px;}13 .box ul li a{line-height:32px; text-align:center;color:#fff;background:url(http://img.baidu.com/img/iknow/exp/global/step_ico_bg.png) no-repeat left top;width:32px;height:32px;display:block;position:absolute;left:-16px;top:0;}14 .icon_link{position:fixed;top:0;left:34px;}15 .icon_link a{line-height:32px; text-align:center;color:#fff;background:url(http://img.baidu.com/img/iknow/exp/global/step_ico_bg.png) no-repeat left -68px;width:32px;height:32px;display:block;display:none;}16 17 .icon_link a.current{background-position:0 0;}18 </style>19 <script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>20 <script src="mousewheel.js"></script>21 <script>22 $(function(){23         var $window = $(window);24         var iconList = $(.icon_link a);25         var aList = $(ul a);26         aList.each(function(index,em){27                 $(this).attr(top,index*32);28         });29         $window.scroll(function(){30                         var scrollTop = $window.scrollTop();31                         if(($(ul a:last).offset().top+ $(ul li:last).outerHeight()) - scrollTop-150 <= 0){32                                 aList.css(visibility,visible);33                                 iconList.css(display,none);34                                 return;35                         }36                         aList.each(function(index,em){37                                 if(aList.eq(index).offset().top - scrollTop <= aList.eq(index).attr(top)){38                                         aList.eq(index).css(visibility,hidden);39                                         iconList.removeClass(current);40                                         iconList.eq(index).addClass(current).css(display,block);41                                 }else{42                                         aList.eq(index).css(visibility,visible);43                                         iconList.eq(index).removeClass(current).css(display,none);44                                 }45                         });46                         47         });48         iconList.click(function(){49                 var i = $(this).index();50                 var t = $(ul li).eq(i).offset().top;51                 $(body,html).stop().animate({scrollTop:t});52         });53 })54 </script>55 </head>56 57 <body>58 <div class="box">59     <div class="box2"></div>60         <ul>61             <li id="icon1"><a>1</a><img src="http://hiphotos.baidu.com/exp/w=500/sign=ab84830bc9ea15ce41eee00986013a25/203fb80e7bec54e79e6ef790b9389b504ec26aba.jpg"></li>62             <li id="icon2"><a>2</a><img src="http://hiphotos.baidu.com/exp/w=500/sign=8ca475112edda3cc0be4b82031e83905/5fdf8db1cb134954ceb104ea564e9258d0094a95.jpg"></li>63             <li id="icon3"><a>3</a><img src="http://hiphotos.baidu.com/exp/w=500/sign=33fa75d0ddc451daf6f60ceb86fc52a5/b64543a98226cffc3638523cb9014a90f603ea2a.jpg"></li>64     </ul>65     <div>end</div>66     <div class="icon_link">67             <a href="javascriptl:;" class="icon1">1</a>68             <a href="javascriptl:;" class="icon2">2</a>69             <a href="javascriptl:;" class="icon3">3</a>70     </div>71     <div class="box3"></div>72 </div>73 </body>74 </html>