鼠标经过图片时变换的两种方法--css+div及javascript应用

javascript方式：熟悉使用document.getElementById()取得节点对象

<!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>

<style>

.div_n{

width:300px;

height:250px;

border:1px solid gray;

}

</style>

<script type="text/javascript">

function changeSrc1()

  {

  document.getElementById("myImage").src="/images/2.gif"

  }

function changeSrc2()

  {

  document.getElementById("myImage").src="/images/1.gif"

  }

</script>

</head>

<body>

<div class="div_n">

<a href="http://www.baidu.com">

<img id="myImage" src="/images/1.gif"  onmouseover="changeSrc1()" onmouseout="changeSrc2()"/>

</a>

</div>

</body>

</html>

css+div方式：合理控制层的样式

<!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>

  <title> New Document </title>

  <style>

    .main{

        width:300px;

        height:250px;

        border:1px solid gray;

    }

    .content{

        width:150px;

        height:160px;

        border:1px solid gray;

        background-image:url(images/2.gif);

        background-repeat: no-repeat;

    }

    .content:hover{

        background-image:url(images/3.jpg);

    }

    a{

        text-decoration:none;

    }

  </style>

 </head>

 <body>

  <div class="main">

    <a href="http://www.baidu.com/"><div class="content"></div></a>

  </div>

 </body>

</html>