ajax丢：XML descendants internal method called on incompatible HTMLDocument

ajax丢：XML descendants internal method called on incompatible HTMLDocument

struts2中使用二级联动标签<s:doubleselect/>时总是丢：XML descendants internal method called on incompatible HTMLDocument  错误，检查标签格式，取值以及listKey,listValue,doubleName,boubleList,doubleListKey,doubleListValue.......所有可能出错的地方，但就是一直丢这个错误，后来检查标签<s:doubleselect/>外面有一个<s:form action="" type="post">....</s:form>,问题就出在这里，将action属性赋值,eg:action="xxxxAction.action"就好了，或者干脆将action属性砍掉！一切正常！！