当鼠标移动到小图片上时，小图片显示红色边框并在上面大图片显示相应大图片，效果如图：
<!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">#div{width:500px;height:500px;border:1px solid #fff;margin:auto;background:#fff}li{list-style:none;float:left;margin-top:-15px;margin-left:50px}</style></head><body><div id="div"><div style="width:350px;height:262px;border:1px solid #fff;margin:auto;"> <img src="images/show1_big.jpg" width="349" height="262" /> </div><div style="width:500px;height:50px;border:1px solid #fff;margin-top:180px"><!--ul开始--><ul> <li><img src="images/show1.jpg" width="53" height="46" onmouSEOver="change()"/> </li> <li><img onmouseover="change1()" src="images/show2.jpg" width="53" height="46" /> </li> <li><img src="images/show3.jpg" width="53" height="46" onmouseover="change2()"/> </li> <li><img src="images/show4.jpg" width="53" height="46" onmouseover="change3()" /> </li> </ul> <!--ul结束--> </div></div></body><script type="text/Javascript">//定义function kuang(){ var getli=document.getElementsByName("li"); for(var i=0;i<getli.length;i++){ } } //定义替换图片方法function change(){ var imgs=document.getElementsByTagName("img"); imgs[0].setAttribute("src","images/show1_big.jpg"); imgs.style.width="border:1px solid red"; } //定义替换图片方法 function change1(){ var imgs=document.getElementsByTagName("img"); imgs[0].setAttribute("src","images/show2_big.jpg"); } //定义替换图片方法 function change2(){ var imgs=document.getElementsByTagName("img"); imgs[0].setAttribute("src","images/show3_big.jpg"); } //定义替换图片方法 function change3(){ var imgs=document.getElementsByTagName("img"); imgs[0].setAttribute("src","images/show4_big.jpg"); } </script></html>
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