This Is A FineDay

<script type="text/javascript">
var xmlHttp;
var requestType = "";

function createXMLHttpRequest() {
    if (window.ActiveXObject) {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if (window.XMLHttpRequest) {
        xmlHttp = new XMLHttpRequest();
    }
}
   
function startRequest(requestedList) {
    requestType = requestedList;
    createXMLHttpRequest();
    xmlHttp.onreadystatechange = handleStateChange;
    xmlHttp.open("GET", "parseXML.xml", true);
    xmlHttp.send(null);
}
   
function handleStateChange() {
    if(xmlHttp.readyState == 4) {
        if(xmlHttp.status == 200) {
            if(requestType == "north") {
                listNorthStates();
            }
            else if(requestType == "all") {
                listAllStates();
            }
        }
    }
}
 
function listNorthStates() {
    var xmlDoc = xmlHttp.responseXML;
    var northNode = xmlDoc.getElementsByTagName("north")[0];
   
    var northStates = northNode.getElementsByTagName("state");
   
    outputList("Northern States", northStates);
}

function listAllStates() {
    var xmlDoc = xmlHttp.responseXML;
    var allStates = xmlDoc.getElementsByTagName("state");
   
    outputList("All States in Document", allStates);
}

function outputList(title, states) {
    var out = title;
    var currentState = null;
    for(var i = 0; i < states.length; i++) {
        currentState = states[i];
        out = out + "\n- " + currentState.childNodes[0].nodeValue;
    }
   
    alert(out);
}
</script>

parseXML.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<states>
    <north>
        <state>Minnesota</state>
        <state>Iowa</state>
        <state>North Dakota</state>
    </north>
    <south>
        <state>Texas</state>
        <state>Oklahoma</state>
        <state>Louisiana</state>
    </south>
    <east>
        <state>New York</state>
        <state>North Carolina</state>
        <state>Massachusetts</state>
    </east>
    <west>
        <state>California</state>
        <state>Oregon</state>
        <state>Nevada</state>
    </west>
</states>