无法加载xml文档
city.html
<!DOCTYPE html><html> <head> <title>city.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> <select id="province" name="province"> <option value="">请选择……</option> <option value="山东">山东</option> <option value="河南">河南</option> <option value="河北">河北</option> </select> <select id="city" name="city"> <option value="">请选择……</option> </select> </body><script type="text/javascript"> window.onload = function(){ document.getElementById("province").onchange = function(){ alert("aaa"); //测试xml文档是否加载成功 var xmlDoc = parseXML("cities.xml"); var provinceElements = xmlDoc.getElementsByTagName("province"); alert(provinceElements.length); } } /** *加载xml文档 */ function parseXML(filename) { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp = new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.open("GET", filename, false); xmlhttp.send(); xmlDoc = xmlhttp.responseXML; }</script></html><?xml version="1.0" encoding="UTF-8"?><china> <province name='山东'> <city>济南</city> <city>菏泽</city> <city>青岛</city> <city>大连</city> </province> <province name='河南'> <city>郑州</city> <city>许昌</city> <city>洛阳</city> <city>开封</city> </province> <province name='河北'> <city>保定</city> <city>石家庄</city> <city>秦皇岛</city> </province></china>