<button onclick="addimg()">add Image</button>
<script>
function addimg(){
var img = new Image();
img.src = "http://expert.csdn.net/images/csdn.gif"
document.body.appendChild(img);
}
</script>
<script>
function addimg(){
var img = new Image();
img.src = "http://expert.csdn.net/images/csdn.gif"
document.body.appendChild(img);
}
</script>
a=new Image()
a.src="http://expert.csdn.net/images/csdn.gif"
b=new Image()
b.src="http://www.csdn.net/images/ad/vsnet_120.gif"
function aa(o)
{
eval("document.all.i.src="+o +".src")
}
</script>
<img src="http://lucky.myrice.com/javabk1.jpg" id=i onmouseover="aa('a')" onmouseout="aa('b')" >
方法二、在服务器端生成图像,然后把图像数据写到输出流上