prompt undefined when calling external JS directly in methods method in VUE is not easy to use var variable, but if this method is placed in mui.ajax (); it works strangely for a long time hoping that God can help me solve

//JS
<script src="../js/InitDb.js"></script> 
 
//JS
var DB_NAME = "PDALUNBO";
var DB_VERSION = 20190101; //
var db;
//readwrite
var READ_WRITE = "readwrite";
//readwrite
var READ_ONLY = "readonly";

function initDb() {
    console.debug("initDb ...");
    var req = indexedDB.open(DB_NAME, DB_VERSION);
    req.onsuccess = function(evt) {
    db = evt.target.result;
    console.debug("initDb opened");
    };
    req.onerror = function(evt) {
    console.error("initDb error:", evt.target.errorCode || evt.target.error);
    };

    //,onupgradeneeded(onsuccess)
    req.onupgradeneeded = function(evt) {
    console.debug("initDb.onupgradeneeded");
    var db = evt.currentTarget.result;
    //ObjectStoreonupgradeneeded
    //
    if (!db.objectStoreNames.contains("users")) {
        var usersStore = db.createObjectStore("users", {
            keyPath: "PLANID"
        });
    }
    usersStore.createIndex("PROJDATE", "time", {
        unique: true
    });
   };
  }
 
 
 
 
 
 
 //VUE
 new Vue({
 el: "-sharpproduction",
 data: {
    GetTLPlanList: null
 },
 methods: {
    //   
    Get_TLPlanList: function() {
        var _this = this;
        document.getElementById("beginTime2").placeholder = getYDate();
        document.getElementById("overTime2").placeholder = getTDate();
        var beginTime = document.getElementById("beginTime2").value;
        var overTime = document.getElementById("overTime2").value;
        var workid = 0;
        var deptcode = plus.storage.getItem("dept_code");
        if (beginTime == "") {
            beginTime = getYDate();
        }
        if (overTime == "") {
            overTime = getTDate();
        }
        mui.ajax("http://", {
            data: {
                time_from: beginTime,
                time_to: overTime,
                work_id: workid,
                dept_code: deptcode
            },
            dataType: "json",
            type: "post",
            timeout: 50000,
            success: function(res) {
                //
                initDateFormat();
                var users = JSON.parse(res);
                for (i = 0; i < users.length; iPP) {
                    users[i].PROJDATE = getYear() + new Date(users[i].PROJDATE).format("MMddHHmm");
                }
                console.log(JSON.stringify(users));
                var tx = db.transaction("users", READ_WRITE);
                var store = tx.objectStore("users");
                var i = 0,
                    len = users.length;
                while (i < len) {
                    var req = store.put(users[iPP]);
                    req.onsuccess = function(evt) {
                        console.debug("");
                    };
                    req.onerror = function(evt) {
                        console.error(":", evt.target.errorCode || evt.target.error);
                    };
                }
                var index = store.index("PROJDATE");
                var request = index.openCursor(IDBKeyRange.bound(clearInput(beginTime) + "000000", clearInput(overTime) +
                    "235959", false, false));
                request.onsuccess = function(evt) {
                    var res = evt.target.result;
                    if (res) {
                        console.log(JSON.stringify(res.value));
                        res.continue();
                    }
                }
                request.onerror = function(evt) {

                }
                console.log("GetTLPlanList");
            },
            error: function() {
                console.log("GetTLPlanList");
            }
        });
    },
    //   MUI.AJAX  VUEundefined transaction
    Get_TLPlanListNonet: function() {
        var tx = db.transaction("users", READ_WRITE);
        var store = tx.objectStore("users");
        var index = store.index("PROJDATE");
        var request = index.openCursor(IDBKeyRange.bound(clearInput(beginTime) + "000000", clearInput(overTime) +
            "235959", false, false));
        request.onsuccess = function(evt) {
            var res = evt.target.result;
            if (res) {
                console.log(JSON.stringify(res.value));
                res.continue();
            }
        }
        request.onerror = function(evt) {

        }
        console.log("");
    }
},
mounted: function() {
    initDb(); // VUE 
                undefined transaction
    var nt = plus.networkinfo.getCurrentType(); //
    if (nt == "2" || nt == "3" || nt == "6") {
        this.Get_TLPlanList();
    }
    if (nt != "2" || nt != "3" || nt != "6") {
        this.Get_TLPlanListNonet();
    }
}

});