<!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" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>选项卡</title> <style type="text/css"> .active{ background: yellow; } div{ 100px; height: 100px; background: #888888; display: none; } </style> <script type="text/javascript"> window.onload=function() { var aBtn=document.getElementsByTagName('input'); var aDiv=document.getElementsByTagName('div'); for(var i=0;i<aBtn.length;i++) { aBtn[i].index=i;//设置索引 aBtn[i].onmouseover=function() { for(i=0;i<aBtn.length;i++) { aBtn[i].className =''; aDiv[i].style.display='none'; } this.className='active';//this 指当前发生的事件； aDiv[this.index].style.display='block';//this.index 加入索引值 //注意：通过html 自定义的属性，浏览器是不通过的，而通过js 加进去的能行 } }; } </script> </head> <body> <input class="active" type="button" value="1"> <input type="button" value="2"> <input type="button" value="3"> <div style="display:block;">11111</div> <div>22222</div> <div>333333</div> </body> </html>