一段Ajax做的RSS訂閱器JS代碼

var xmlHttp;

function ShowRSS() {
var target=document.getElementById("targeturl");
alert(target.value);
readRSS(target.value);
}
function createXMLHttpRequest() {
    if (window.ActiveXObject) {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    } 
    else if (window.XMLHttpRequest) {
        xmlHttp = new XMLHttpRequest();
    }
}
    
function readRSS(url) {
    createXMLHttpRequest();
    xmlHttp.onreadystatechange = handleStateChange;
    xmlHttp.open("GET", url, true);
    xmlHttp.send(null);
}
    
function handleStateChange() {
    if(xmlHttp.readyState == 4) {
        if(xmlHttp.status == 200) {
            clearPreviousResults();
            parseResults();
        }
    }
}

function clearPreviousResults() {
    var ListBody = document.getElementById("resultsTitle");
    while(ListBody.childNodes.length > 0) {
        ListBody.removeChild(ListBody.childNodes[0]);
    }
}

function parseResults() {
    var results = xmlHttp.responseXML;
    var title = null;
	var content=null;
    var item = null;

    var items = results.getElementsByTagName("item");
    for(var i = 0; i < items.length; i++) {
        item = items[i];
        title = item.getElementsByTagName("title")[0].firstChild.nodeValue;
		content=item.getElementsByTagName("description")[0].firstChild.nodeValue;
        addListRow(title,content);
		
    }

}


function addListRow(title,content) {
    var row = document.createElement("ul");
    var cell = createCellWithText(title);
	var contentcell=createCellWithContent(content);
    row.appendChild(cell);
	row.appendChild(contentcell);
    
    document.getElementById("resultsTitle").appendChild(row);
}

function createCellWithText(text) {
    var cell = document.createElement("li");
    var textNode = document.createTextNode(text);
	
    cell.appendChild(textNode);
    
    return cell;
}
function createCellWithContent(content) {
var cell=document.createElement("h1")
 var textNode = document.createTextNode(content);
	
    cell.appendChild(textNode);
    
    return cell;
}
 
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