写一个根据xpath获取元素的方法

function _x(STR_XPATH) {    var xresult = document.evaluate(STR_XPATH, document, null, XPathResult.ANY_TYPE, null);    var xnodes = [];    var xres;    while (xres = xresult.iterateNext()) {        xnodes.push(xres);    }    return xnodes;}