<!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>鼠标移入/移出改变样式</title> <style> body{color:#fff;font:12px/1.5 Tahoma;} #div1{width:150px;height:150px;margin:0 auto;padding:10px;background:black;border:10px solid #000;cursor:crosshair;} #div1.hover{color:red;background:#f0f0f0;border:10px solid red;} </style> <script> window.onload = function () { var oDiv = document.getElementById("div1"); oDiv.onmouseover = function () { oDiv.className = "hover" }; oDiv.onmouseout = function () { oDiv.className = "" } }; </script> </head> <body> <div id="div1">鼠标移入改变样式，鼠标移出恢复。</div> </body> </html>
原文：http://www.cnblogs.com/mayufo/p/4474928.html