<body>
<li id="li1" style="list-style-image:url(baijiao.gif)"><a href="#" onclick="img()">哈哈</a></li>
</body>
<script>
function img(){
var li1 = document.getElementById("li1");
alert(li1.style.listStyleImage);
li1.style.listStyleImage = "url(http://www.csdn.net/CSDN_Common_Header_Footer/Images/BiaoShi.gif)";
}
</script>
<li id="li1" style="list-style-image:url(baijiao.gif)"><a href="#" onclick="img()">哈哈</a></li>
</body>
<script>
function img(){
var li1 = document.getElementById("li1");
alert(li1.style.listStyleImage);
li1.style.listStyleImage = "url(http://www.csdn.net/CSDN_Common_Header_Footer/Images/BiaoShi.gif)";
}
</script>
<li id= "li1" style= "list-style-image:url(baijiao.gif)"> <a href= "#" onclick= "img()">哈哈</a></li>
</body>
<script type="text/javascript">
function img(){
var li1 = document.getElementById("li1");
var nw = li1.style.listStyleImage;
alert(nw);
li1.style.listStyleImage = "url(http://www.csdn.net/CSDN_Common_Header_Footer/Images/BiaoShi.gif)";
}
</script>