webwork iterator 遍历双重list
经常会需要遍历双层的list，可以用脚本语言，但如果想用标签的话，下边是个例子：
构造一个双层列表：
<div style="border: 1px solid rgb(204, 204, 204); padding: 4px 5px 4px 4px; font-size: 13px; width: 98%; background-color: rgb(238, 238, 238);">http://www.blogjava.net/Images/OutliningIndicators/None.gifoutList = new ArrayList();
http://www.blogjava.net/Images/OutliningIndicators/None.gif
http://www.blogjava.net/Images/OutliningIndicators/None.gifinList= new ArrayList();
http://www.blogjava.net/Images/OutliningIndicators/None.gifinList.add(new Element("1","a"));
http://www.blogjava.net/Images/OutliningIndicators/None.gifinList.add(new Element("2","b"));
http://www.blogjava.net/Images/OutliningIndicators/None.gifoutList.add(inList);
http://www.blogjava.net/Images/OutliningIndicators/None.gif
http://www.blogjava.net/Images/OutliningIndicators/None.gifinList= new ArrayList();
http://www.blogjava.net/Images/OutliningIndicators/None.gifinList.add(new Element("3","c"));
http://www.blogjava.net/Images/OutliningIndicators/None.gifinList.add(new Element("4","d"));
http://www.blogjava.net/Images/OutliningIndicators/None.gifoutList.add(inList);
http://www.blogjava.net/Images/OutliningIndicators/None.gif
http://www.blogjava.net/Images/OutliningIndicators/None.gif遍历：
http://www.blogjava.net/Images/OutliningIndicators/None.gif<ww:iterator value="outList">
http://www.blogjava.net/Images/OutliningIndicators/None.gif <ww:iterator value="top">
http://www.blogjava.net/Images/OutliningIndicators/None.gif <ww: property value="key"/>,<ww: property value="value"/>
http://www.blogjava.net/Images/OutliningIndicators/None.gif </ww:iterator>
http://www.blogjava.net/Images/OutliningIndicators/None.gif</ww:iterator>
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