struts2中如何使用jquery为<s:param>标签赋value值?

Question

<s:url id="uploadUrl" action="b030201" method="init">
              <s:param name="filePath">C:\apache-ant-1.8.2\fetch.xml</s:param>
</s:url>

如何用jquery为<s:param>标签赋value值?