Javascript Ajax callback function passing parameters

In JavaScript, especially in Ajax, the callback function is often a function name, there is no place to put parameters, such as the following Ajax code, after success will call the callback function callback, but callback is a parameter, how to pass the parameters in it?

             var callback = function (p1) {         //do something      }      var ajaxsetting = {            Url:url,            timeout:me.timeout,            Type:method,            contentType: "Application/json",            dataType: "JSON",            Cache:false,            Async:async,            Data:p_data,            success:callback            },            error:function (P_request, P_status, P_err) {            }        };

The workaround is to use anonymous functions:

Success:function (Result) {

Callback (p1_actual);

}

Where Pa_actual is a known parameter and can be a function type.

Javascript Ajax callback function passing parameters