Why does $.ajaxSetup not work with $.post

问题

Why does this code post the sessionID parameter

    $.post("ajax/p_getOnePosition.jsp", {
        positionNo: positionNo,
        sessionID: v_sessionID,
    }, function(response2) {

But not this code

    $.ajaxSetup({
        sessionID: v_sessionID,
    });
    
    $.post("ajax/p_getOnePosition.jsp", {
        positionNo: positionNo,
    }, function(response2) {

回答1:

Use beforeSend instead as follows. Code inspired from here

$.ajaxSetup({
     beforeSend: function (jqXHR, settings) {
        settings.data += "&sessionID="+v_sessionID;
  }
});

$.post("ajax/p_getOnePosition.jsp", {
    positionNo: positionNo,
}, function(response2) {

来源：https://stackoverflow.com/questions/65617103/why-does-ajaxsetup-not-work-with-post