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http://www.morgantechspace.com/2014/01/Call-Server-Side-function-from-JavaScript-in-ASP-NET.html

 

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Call Server Side method from JavaScript in ASP.NET using PageMethods</title>
    <script type="text/javascript">
        function GetServerDate(format) {
            PageMethods.GetServerDate(format, OnSuccess, OnFailure);
        }
        function OnSuccess(dateTime) {
            if (dateTime) {
                document.getElementById("currentDate").innerHTML = dateTime;
            }
        }
        function OnFailure(error) {
            alert(error);
        }
  
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="scripman1" runat="server" EnablePageMethods="True">
    </asp:ScriptManager> 這行一定要有
    <div>
        <input type="button" value="Show UTC Server Time" onclick="GetServerDate('utc')" />
        <input type="button" value="Show Local Server Time" onclick="GetServerDate('local')" />
        <label id="currentDate">
            This is current Date Time in Web Server</label>
    </div>
    </form>
</body>
</html>
 
 
protected void Page_Load(object sender, EventArgs e)
{
}
 
[System.Web.Services.WebMethod(EnableSession=True)] 使用session要加
public static string GetServerDate(string format)
{
HttpContext.Current.Session["amy"] = "amy"; 跟Session["amy"]共用
    if (format.Equals("utc"))
    {
        return DateTime.Now.ToUniversalTime().ToString();
    }
    else
    {
        return DateTime.Now.ToLocalTime().ToString();
    }
}

 
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