.net 前台 调用js值

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script type="text/javascript">
    function getData() {
        $.ajax({
            type: "POST",
            url: "YourPage.aspx/GetDataMethod", // Your ASP.NET page and method
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(response) {
                alert(response.d); // Show the data received from server
            },
            failure: function(response) {
                alert(response.d);
            }
        });
    }
</script>

public class ChatHub : Hub
{
    public void SendMessage(string user, string message)
    {
        Clients.All.broadcastMessage(user, message);
    }
}

<script src="~/Scripts/jquery.signalR-2.4.3.min.js"></script>
<script src="~/signalr/hubs"></script>
<script type="text/javascript">
    $(function () {
        var chat = $.connection.chatHub;
        chat.client.broadcastMessage = function (user, message) {
            $('#messages').append('<li>' + user + ': ' + message + '</li>');
        };
        $.connection.hub.start().done(function () {
            $('#sendmessage').click(function () {
                chat.server.sendMessage($('#userInput').val(), $('#messageInput').val());
            });
        });
    });
</script>