如何在phoneGap api中使javascript变量成为全局变量

我现在正在学习如何使用phonegap，学习进行得很顺利，但我一直坚持使用phonegap Api中的全局变量。实际上，我首先从xml文件中获取结果，然后将数据插入数据库。我已经完成了这项工作，但现在我想获取插入行的最后一个id，然后插入到另一个表中，因为在xml中有子节点

function populateDB(tx) {
        tx.executeSql('DROP TABLE IF EXISTS fruit');
        tx.executeSql('DROP TABLE IF EXISTS fruit_benefit');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit (id INTEGER NOT NULL PRIMARY KEY, fname,fsname,fruit_icon,fruit_image)');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit_benefit (id INTEGER NOT NULL PRIMARY KEY, benefit, fruit_id)');
        $.ajax({
        type: "GET",
        url: "data.xml",
        dataType: "xml",
        success: function(xml) {
            $(xml).find('fruit').each(function(){
                var fname = $(this).find('fname').text();
                var fsname = $(this).find('fsname').text();
                var fruit_icon = $(this).find('fruit_icon').text();
                var fruit_image = $(this).find('fruit_image').text();
                //$('<div class="items" id="link_'+fname+'"></div>').html('<a href="'+fsname+'">'+fname+'</a>').appendTo('#lbUsers');
                db.transaction(function(transaction) { 
                    transaction.executeSql('INSERT INTO fruit (fname,fsname,fruit_icon,fruit_image) VALUES (?,?,?,?)',[fname, fsname, fruit_icon, fruit_image],function(transaction, results){
               var lastId = results.insertId; 
            },nullHandler,errorHandler);
              });

              alert(lastId);

            });
        }
    });

}

---

我已经尝试了JavaScript全局变量和本地存储，但两者都不起作用。

你甚至不需要全局变量。在函数中但在foreach之前定义lastId。如果这不起作用，那么通过移动var lastId，使其全局化应该真正起作用；函数填充B之前的行

function populateDB(tx) {
        tx.executeSql('DROP TABLE IF EXISTS fruit');
        tx.executeSql('DROP TABLE IF EXISTS fruit_benefit');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit (id INTEGER NOT NULL PRIMARY KEY, fname,fsname,fruit_icon,fruit_image)');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit_benefit (id INTEGER NOT NULL PRIMARY KEY, benefit, fruit_id)');
        $.ajax({
        type: "GET",
        url: "data.xml",
        dataType: "xml",
        success: function(xml) {

            var lastId;

            $(xml).find('fruit').each(function(){
                var fname = $(this).find('fname').text();
                var fsname = $(this).find('fsname').text();
                var fruit_icon = $(this).find('fruit_icon').text();
                var fruit_image = $(this).find('fruit_image').text();
                //$('<div class="items" id="link_'+fname+'"></div>').html('<a href="'+fsname+'">'+fname+'</a>').appendTo('#lbUsers');
                db.transaction(function(transaction) { 
                    transaction.executeSql('INSERT INTO fruit (fname,fsname,fruit_icon,fruit_image) VALUES (?,?,?,?)',[fname, fsname, fruit_icon, fruit_image],function(transaction, results){
               lastId = results.insertId; 
            },nullHandler,errorHandler);
              });

              alert(lastId);

            });
        }
    });

}

---

这个问题更适合StackOverflow。本网站用于概念性问题。您已在副本下回答，无需在此处复制您的答案。

function populateDB(tx) {
        tx.executeSql('DROP TABLE IF EXISTS fruit');
        tx.executeSql('DROP TABLE IF EXISTS fruit_benefit');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit (id INTEGER NOT NULL PRIMARY KEY, fname,fsname,fruit_icon,fruit_image)');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit_benefit (id INTEGER NOT NULL PRIMARY KEY, benefit, fruit_id)');
        $.ajax({
        type: "GET",
        url: "data.xml",
        dataType: "xml",
        success: function(xml) {

            var lastId;

            $(xml).find('fruit').each(function(){
                var fname = $(this).find('fname').text();
                var fsname = $(this).find('fsname').text();
                var fruit_icon = $(this).find('fruit_icon').text();
                var fruit_image = $(this).find('fruit_image').text();
                //$('<div class="items" id="link_'+fname+'"></div>').html('<a href="'+fsname+'">'+fname+'</a>').appendTo('#lbUsers');
                db.transaction(function(transaction) { 
                    transaction.executeSql('INSERT INTO fruit (fname,fsname,fruit_icon,fruit_image) VALUES (?,?,?,?)',[fname, fsname, fruit_icon, fruit_image],function(transaction, results){
               lastId = results.insertId; 
            },nullHandler,errorHandler);
              });

              alert(lastId);

            });
        }
    });

}