考慮到網站首頁使用動態(tài)頁面的話會影響服務器性能，所以采用javascript來實現(xiàn)首頁的動態(tài)更新。

原理，以發(fā)新聞稿為例，當后臺發(fā)出一條新聞后，通過訪問數(shù)據(jù)庫動態(tài)生成一個XML文件，保存新聞的信息，當打開前臺頁面時，使用javascript讀取XML文件并顯示。

后臺代碼：

sseEntities _db = new sseEntities();
??????????? var newsToView = (from n in _db.News select n).ToArray().Reverse().ToList();

??????????? XmlDocument xd = new XmlDocument();
??????????? XmlDeclaration xde;
??????????? xde = xd.CreateXmlDeclaration("1.0", "GBK", null);
??????????? xd.AppendChild(xde);

??????????? XmlElement newslist = xd.CreateElement("newslist");
??????????? xd.AppendChild(newslist);
??????????? XmlNode root = xd.SelectSingleNode("newslist");
??????????? XmlElement [] news = new XmlElement [4];
??????????? XmlElement [] text = new XmlElement [4];
??????????? XmlElement [] img = new XmlElement[4];
??????????? for (int i = 0; i < 4; i++)
??????????? {
??????????????? news[i] = xd.CreateElement("news");
??????????????? text[i] = xd.CreateElement("text");
??????????????? img[i] = xd.CreateElement("img");
??????????????? news[i].SetAttribute("id", i.ToString());
??????????????? if (i < newsToView.Count)
??????????????? {
??????????????????? text[i].InnerText = newsToView[i].Title;
??????????????????? img[i].InnerText = "Content/newsimages/slider_item1.png";
??????????????? }
??????????????? else
??????????????? {
??????????????????? text[i].InnerText = "";
??????????????????? img[i].InnerText = "";
??????????????? }
??????????????? news[i].AppendChild(text[i]);
??????????????? news[i].AppendChild(img[i]);
??????????????? root.AppendChild(news[i]);
??????????? }
??????????? xd.Save(Server.MapPath("../Sources/News.xml"));

前臺讀取代碼：

<script type="text/javascript">
??????? function loadXML(xmlFile) {
??????????? var xmlDoc;集裝箱運費
??????????? if (!window.ActiveXObject) {
??????????????? var parser = new DOMParser();
??????????????? xmlDoc = parser.parseFromString(xmlFile, "text/xml");
??????????? } else {
??????????????? xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
??????????????? xmlDoc.async = "false";
??????????????? xmlDoc.load(xmlFile);
??????????? }
??????????? return xmlDoc;iphone5
??????? }
??????? var xmlDoc = loadXML("Sources/News.xml");
??????? //解析xml文件，判斷是否出錯
??????? if (xmlDoc.parseError.errorCode != 0) {
??????????? alert(xmlDoc.parseError.reason);
??????? }
??????? //獲得根節(jié)點
??????? var nodes = xmlDoc.documentElement.childNodes;
??? </script>

轉載于:https://www.cnblogs.com/sky7034/archive/2011/06/20/2084995.html

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