javascript 层隐藏和显示的代码

<！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>层隐藏和显示 2009-7-7</title> <script language="javascript" type="text/javascript"> function doit（）{ var m = document.getElementById（"menu"）; m.innerText = m.innerText == "更多"？"收起":"更多"; document.getElementById（"content1"）.style.display = m.innerText == "更多"？"block":"none"; document.getElementById（"content2"）.style.display = m.innerText == "更多"？"none":"block"; } </script> <style type="text/css"> #content1,#content2{ width:300px; height:200px; border:1px solid black; background:#cccccc; } #menu{ cursor:pointer; } </style> </head> <body> <span id="menu" onclick="doit（）">更多</span>我是更多里面的内容我不是更多里面的内容</body> </html>
[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]