CommentsTest.html代码：
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script src="jquery-1.8.3.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$.ajax({
type: "post", url: "CommentsTest.ashx", data: { action: 'loadMsgs' },
success: function (data) {
for (var i = 0; i < data.length; i++) {
var msg = data[i];
$("#ulMsgs").append($("<li>发表日期：" + msg.CreateDateTime + "；IP地址：" + msg.IP + "；消息：" + msg.Msg + "</li>"));
}
},
error: function () { alert("请求错误"); }
}); $("#btnPost").click(function () {
var msg = $("#txtMsg").val();
$.ajax({
type: "post", url: "CommentsTest.ashx", data: { msg: msg, action: 'post' },
success: function (data) {
if (data.Status == "ok") {
//alert("发表成功");
$("#ulMsgs").append($("<li>发表日期：刚刚；IP地址：本机；消息：" + msg + "</li>"));
$("#txtMsg").val("");
}
else if (data.Status == "error") {
alert(data.Msg);
}
},
error: function () { alert("请求错误"); }
});
});
});
</script>
</head>
<body>
<ul id="ulMsgs"> </ul> <br />
<textarea id="txtMsg" cols="50" rows="5"></textarea><br />
<input type="button" id="btnPost" value="发表" />
</body>
CommentsTest.ashx代码：
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
string action = context.Request["action"];
if (action == "loadMsgs")
{
DataTable dt = SQLHelper.ExecuteReader("select * from T_Comments");
List<Object> list = new List<object>();
foreach (DataRow row in dt.Rows)
{
string msg = (string)row["Msg"];
DateTime createDT = (DateTime)row["CreateDateTime"];
string ip = (string)row["IP"];
//JavaScriptSerializer在序列化DateTime的时候序列化出的东西不好看，可以在服务器端ToString()转换为字符串
//也可以在浏览器端，使用JS把/DATE\(203377733)/转换为字符串格式
list.Add(new { Msg = msg, CreateDateTime = createDT.ToString(), IP = ip });
}
context.Response.Write(new JavaScriptSerializer().Serialize(list));
}
else if (action == "post")
{
string msg = context.Request["msg"];
string ip = context.Request.UserHostAddress;
SQLHelper.ExecuteNonQuery("insert into T_Comments(Msg,CreateDateTime,IP) values(@Msg,@CreateDateTime,@IP)",
new SqlParameter("@Msg", msg), new SqlParameter("@CreateDateTime", DateTime.Now),
new SqlParameter("@IP", ip));
context.Response.Write(new JavaScriptSerializer().Serialize(new { Status = "ok", Msg = "发表成功" }));
}
else
{
throw new Exception("action错误");
}
}