<!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=utf-8" /> <title>无标题文档</title> <style type="text/css"> #div1{ width:100px; height:100px; background:pink; display:none; } </style> </head><body> <p>2秒后自动显示这个层</p> <div id="div1"></div> <script type="text/javascript"> var div1=document.getElementById("div1"); function show(){ div1.style.display="block"; } setTimeout(show,2000); </script> </body> </html>