下面是我写的一个根据路径从XML文档中取值的方法,在XML节点比较少时,性能还可以,但如果节点太多,性能就不行了,大家看看哪里还能再优化?
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/* 获取XML对象中某个节点的值,支持下标
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例:GetNodeValue(xmlDoc, 'root/channel[1]/title[3]');
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xmlObj:XML对象;
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path:要获取值的节点路径,如:'root/channel[1]/title[3]',不加下标时自动选择第一个,找不到节点时返回空;
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*/
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function GetNodeValue(xmlObj, path)
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{
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var tempNodes = xmlObj;
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if (!tempNodes) return '';
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var tns = path.split('/');
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var reg = /.*(\[(\d+)\])/;
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var isGet = false; //判断是否获取到了值
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for (var i = 0, l = tns.length; i < l; i++)
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{
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//提出名字与下标值
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var tmp_name = tns[i];
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var tmp_sub = 0;
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var tmp_array = tmp_name.match(reg);
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if (tmp_array != null)
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{
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tmp_sub = tmp_array[2];
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tmp_name = tmp_name.replace(tmp_array[1], '');
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}
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isGet = false;
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try{
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if (tempNodes) tempNodes = tempNodes.getElementsByTagName(tmp_name)[tmp_sub];
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}
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catch (e)
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{
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return '';
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}
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if (tempNodes) isGet = true;
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}
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if (isGet)
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{
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if (isIE)
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return tempNodes.text;
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else
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return tempNodes.textContent
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}
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else
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return '';
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}
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性能提高85%的已经写出来了(此性能是经过测试的):
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/*
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作者:Sandheart E-Mail:sxd.www@gmail.com 日期:2009-02-20
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获取XML对象中某个节点的值,支持下标
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例:GetNodeValue(xmlDoc, 'root/channel[1]/title[3]');
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参数:
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xmlObj:XML对象;
7
path:要获取值的节点路径,如:'root/channel[1]/title[3]',不加下标时自动选择第一个,找不到节点时返回空;
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*/
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function GetNodeValue(xmlObj, path)
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{
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//debugger;
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var tempNodes = xmlObj;
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if (!tempNodes) return '';
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var tns = path.split('/');
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var reg = /.*(\[(\d+)\])/;
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var isGet = false; //判断是否获取到了值
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for (var i = 0, l = tns.length; i < l; i++)
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{
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//提出名字与下标值
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var tmp_name = tns[i];
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var tmp_sub = 0;
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var tmp_array = tmp_name.match(reg);
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if (tmp_array != null)
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{
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tmp_sub = tmp_array[2];
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tmp_name = tmp_name.replace(tmp_array[1], '');
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}
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isGet = false;
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try
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{
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tempNodes = tempNodes.selectNodes(tmp_name)[tmp_sub];
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isGet = true;
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}
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catch (e)
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{
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return '';
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}
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}
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if (isGet && tempNodes)
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{
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if (isIE)
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return tempNodes.text;
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else
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return tempNodes.textContent
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}
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else
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return '';
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}
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如要使用此方法,请保留注释信息,谢谢。