js跨浏览器实现将字符串转化为xml对象的方法

function loadXML(xmlString) { 
var xmlDoc = null; 
if (!window.DOMParser && window.ActiveXObject) { 
var xmlDomVersions = ['MSXML.2.DOMDocument.6.0', 'MSXML.2.DOMDocument.3.0', 'Microsoft.XMLDOM']; 
for (var i = 0; i < xmlDomVersions.length; i++) { 
try { 
xmlDoc = new ActiveXObject(xmlDomVersions[i]); 
xmlDoc.async = false; 
xmlDoc.loadXML(xmlString); 
break; 
} catch (e) { 
} 
} 
} 
else if (window.DOMParser && document.implementation && document.implementation.createDocument) { 
try { 

domParser = new DOMParser(); 
xmlDoc = domParser.parseFromString(xmlString, 'text/xml'); 
} catch (e) { 
} 
} 
else { 
return null; 
} 

return xmlDoc; 
}