常见的效果如：弹窗点击一下窗口外区域，弹窗消失，而点击窗口内部不会消失
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script> <script type="text/javascript"> $(function(){ $("ul,input").click(function(e){ alert(e); e?e.stopPropagation():event.cancelBubble = true; }); $("input").focus(function() { $("ul").fadeIn(); }); $(document).click(function() { $("ul").fadeOut(); }); }) </script> </head> <body> <div style="position:relative"> <input type="text" value="" width="100"> <ul style="position:absolute; top:20px; left:0px; border:1px solid red; height:100px; overflow:scroll;overflow-x:hidden; display:none"> <li>123312312</li> <li>123312312</li> <li>123312312</li> <li>123312312</li> <li>123312312</li> <li>123312312</li> <li>123312312</li> <li>123312312</li> <li>123312312</li> </ul> </div> </body> </html>