JavaScript : XPathEvaluator not supported in IE

问题

I have the following function in JavaScript, and it fails to run when using Internet Explorer.

This function extract the value from a HTML tag, if a XPath is supplied.

How can i replace this function, and with what ?

function lookupElementByXPath(path) {
    var evaluator = new XPathEvaluator(); 
    var result = evaluator.evaluate(path, document.documentElement, null,XPathResult.FIRST_ORDERED_NODE_TYPE, null); 
    return result.singleNodeValue;
}

来源：https://stackoverflow.com/questions/12927990/javascript-xpathevaluator-not-supported-in-ie