How to use JS to send AJAX requests recursively

function onNetChange() {
        var nt = plus.networkinfo.getCurrentType();                //
            if (nt == "2" || nt == "3" || nt == "5" || nt == "6") {
                mui.toast("");
                var tx = db.transaction("users", READ_WRITE);      //
                var store = tx.objectStore("users");               //
                var index = store.index("Ifnet");                  //
                var req = index.openCursor(IDBKeyRange.only("1")); //
                req.onsuccess = function(evt) {                    //
                    var res = evt.target.result;
                    if (res) {
                        var net = [res.value]
                        for (j = 0; j < net.length; jPP) {
                            mui.ajax("http://XXXXX", {
                                data: {
                                    tugwork_s_id: net[j].TUGWORK_S_ID,
                                    IsMooring: net[j].If_mooring,
                                    IsPickup: net[j].ISPICKUP,
                                    godate: net[j].Godate,
                                    startdate: net[j].Startdate,
                                    enddate: net[j].Enddate,
                                    backdate: net[j].Backdate
                                },
                                dataType: "json",
                                type: "post", 
                                timeout: 5000, 
                                success: function(res) {
                                    console.log(JSON.stringify(res));
                                },
                                error: function(xhr, type, errorThrown) {
                                    console.log("Update_local");
                                }
                            });
                        }
                        res.continue(); //
                    }
                };
                req.onerror = function(evt) {                      //
                console.error("UpData error:", evt.target.errorCode || evt.target.error);
                };
                                                
            } 
            else {
                mui.toast("");
            }                
      }

This is what the

code looks like, and it"s very confusing for me to write and send AJAX. Although the data was saved successfully. I want to write a recursive method but I don"t know how to write it. Ask some great god to help me see how I can make this for loop recursive. For example, I found three pieces of data that meet the criteria locally. Then I send three AJAX requests. Failure is not considered for the time being. By default, it is all successful ideally.

if (res) { var j = 0 function request (){ mui.ajax('http://XXXXX', { data: { tugwork_s_id: net[j].TUGWORK_S_ID, IsMooring: net[j].If_mooring, IsPickup: net[j].ISPICKUP, godate: net[j].Godate, startdate: net[j].Startdate, enddate: net[j].Enddate, backdate: net[j].Backdate }, dataType: 'json', type: 'post', timeout: 5000, success: function(res) { console.log(JSON.stringify(res)); }, error: function(xhr, type, errorThrown) { console.log('Update_local'); } }); jPP if (j < net.length) { request () } } // request () }