var result = xmldom.evaluate('employee/name',xmldom.documentElement,null,XPathResult.ORDERED_NODE_ITERATOR_TYPE,null);
if(result !==null){
var element = result.iterateNext(); //iterateNext()的具体作用是什么,书上讲的不太明白。
while(element){
alert(element.tagName);
node= result.iterateNext(): //为什么要重复一次,
}
}
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