固定滚动菜单 <!DOCTYPE html> <html> <head> <meta charset="utf-8"/> <title>test</title> <style type="text/css"> *{ margin:0; padding:0;} .ndiv{ 200px; height:400px; border:1px solid #ccc;background: #f1f1f1;} .fix-div{ position:fixed; top:0px;} </style> </head> <body> <section style="height: 700px;"></section> <div id="mydiv" class="ndiv" >di222v</div> <section style="height: 700px;"></section> </body> </html> 运行代码