未能在全局范围内声明 Var

问：

我想更改 indexedDB 的条目。因此，在输入字段中具有值并将它们提交到现有的数据库条目，然后在再次编辑它们之前检索它们。

现在脚本无法正常工作，因为： 未捕获的 TypeError：db 未定义

通过按下按钮，一个函数被调用，而该函数本身调用一个函数。 Buttonpressfunction --> “updateMarma” --> 使用 “getObjectStore” -->这需要声明 “db” 变量。$('#edit-button').click

起初我不小心把所有东西都放在“open.onsuccess = function（） {”中，db变量是可访问的。但要使它发挥作用，这些功能需要由它们自己完成。但是现在我无法弄清楚如何/在哪里声明 db。

我也尝试过内部，但这仍然没有使它成为全球性的。 我也尝试过IEF。 我在文档中找不到任何其他提示，帮助会很多。open.onupgradeneeded = function() {db = open.result;

(function() {
var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB || window.shimIndexedDB;
var db;
    // Open (or create) the database
    var open = indexedDB.open("marmaDB", 1);
    console.log("open Db ...");

    // Create the schema
    console.log("creating schema ...");
    open.onupgradeneeded = function() {
        var db = open.result;
        var store = db.createObjectStore("marmasStore", {keyPath: "id"});
        var index = store.createIndex("NameIndex", ["name.last", "name.first"]);
            store.createIndex('sanskrit', 'sanskrit', { unique: false });
            store.createIndex('name', 'name', { unique: false });
            store.createIndex('marmaGrp', 'marmaGrp', { unique: false });
            store.createIndex('location', 'location', { unique: false });
            store.createIndex('localisation', 'localisation', { unique: false });
            store.createIndex('awareness', 'awareness', { unique: false });
            store.createIndex('frequency', 'frequency', { unique: false });
      };

    function getObjectStore(store_name, mode) {
        var tx = db.transaction(store_name, mode);
        return tx.objectStore(store_name);
    }

    open.onsuccess = function() {
        console.log("open DB DONE");
        // Start a new transaction
        var db = open.result;
        var tx = db.transaction("marmasStore", "readwrite");
        var store = tx.objectStore("marmasStore");
        var index = store.index("NameIndex");

        // Add some data
        const initialMarmaData = [
            { id: "ani_ll", sanskrit: "ani", name: "Ani", marmaGrp: "snayu", location: "linker Oberschenkel", localisation: 0, awareness: 0, frequency: 0 },
            { id: "ani_rl", sanskrit: "ani", name: "Ani", marmaGrp: "snayu", location: "rechter Oberschenkel", localisation: 0, awareness: 0, frequency: 0 },
            { id: "ani_la", sanskrit: "ani", name: "Ani", marmaGrp: "snayu", location: "linker Arm", localisation: 0, awareness: 0, frequency: 0 },
            { id: "ani_ra", sanskrit: "ani", name: "Ani", marmaGrp: "snayu", location: "rechter Arm", localisation: 0, awareness: 0, frequency: 0 },
        ];

        // Store values in the newly created objectStore.
        // put overwrites date in DB
        // add can only be done once , second time script just stops.
        console.log("initial filling DB ...");
        var store = getObjectStore("marmasStore", 'readwrite');
        initialMarmaData.forEach((marma) => {
            var request = store.put(marma); // maybe change to add and programm errorhandler
            request.onsuccess = (event) => {
                console.log(event.target.result + " initial filling DB DONE");
            };
        });
        
        // Close the db when the transaction is done
        tx.oncomplete = function() {
            db.close();
            console.log("closing DB DONE");
        };
      }

    // Query the data
    function updateMarma(key) {
        console.log("updatePublication:", arguments);
        console.log("key:", key);
        if (typeof store == 'undefined')
            store = getObjectStore("marmasStore", 'readwrite');

        var marmaInfo = store.get(key);
        marmaInfo.onsuccess = function(evt) {
            console.log(key + " FOUND");
            var record = evt.target.result;
            console.log("record:", record);
            if (typeof record == 'undefined') {
                displayActionFailure("No matching record found");
                return;
            }
            console.log("Name for id is  + ${marmaInfo.result.name}");
            alert("ID " + marmaInfo.result.id + " sanskrit " + marmaInfo.result.sanskrit);
        };
    }
      
    $('#edit-button').click(function(evt) {
        console.log("edit ...");
        var key = $('#marmaID').val();

        var new_bodylocation = $('#bodylocation').val();
        var new_awareness = $('#awareness').val();
        if (key != '') {
            console.log("editing " + key);
            updateMarma(key);
        } else {
            console.log("no key provided");
            displayActionFailure("Invalid key")
            return;
        }
    });

})();