标题：[推荐]列表元素的嵌套使用和图片前缀

<ul>
    <li>C</li>
    <li>Web
        <ul>
            <li>Web服务器端开发</li>
            <li>Web客户端开发
                <ul>
                    <li>VBScript</li>
                    <li>JavaScript</li>
                </ul>
            </li>
        </ul>
    </li>
    <li>Java</li>
</ul>

<ul style="list-style:none;">
    <li style="list-style-image:url(blue.jpg)">C</li>
    <li style="list-style-image:url(blue.jpg)">Web
        <ul style="list-style:none;">
            <li>Web服务器端开发</li>
            <li>Web客户端开发
                <ul style="list-style-type:upper-roman">
                    <li>VBScript</li>
                    <li>JavaScript</li>
                </ul>
            </li>
        </ul>
    </li>
    <li style="list-style-image:url(blue.jpg)">Java</li>
</ul>