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removeNamedItem(nodename)
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xmlDoc=loadXMLDoc("books.xml");

var x=xmlDoc.getElementsByTagName('book');

for(i=0;i<x.length;i++)
  {
  x.item(i).attributes.removeNamedItem("category");
  }

NamedNodeMap ¶ÔÏó²Î¿¼ÊÖ²á

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