​x
 
<html>
<head>
<script type="text/javascript">
img2=new Image()
img2.src="/i/eg_landscape3.jpg" 
function changeImage()
{
document.getElementById('myImage').src=img2.src
}
</script>
</head>
​
<body>
​
<p>当您把鼠标移动到图片上时，会出现一幅新的图像。</p>
<img id="myImage" onmouseover="changeImage()" border="0" src="/i/eg_landscape2.jpg">
<p>新图像会立即出现，这是因为您的浏览器已经加载了这幅图像。</p>
​
</body>
</html>
​