Modifying our platform game

We now have all the knowledge we need for creating a multi-level game. First, we will create a list of levels and a function to load them:

var levels = [
        {tiles: "level1.json", enemies: "level1.js"},
        {tiles: "level2.json", enemies: "level2.js"}
    ];
    
    var currentLevel = 0;
    
    var loadNextLevel = function(group){
        var level = levels[currentLevel++];
        // clear old level
        $("#level0").remove();
        $("#level1").remove();
        for(var i = 0; i < enemies.length; i++){
            enemies[i].div.remove();
        }
        enemies = [];
        
        // create the new level
        
        // first the tiles
        gf.importTiled(level.tiles, group, "level");
        
        // then the enemies
        $.getScript(level.enemies);
        
        // finaly return the div holdoing the tilemap
        return $("#level1");
    }

The highlighted lines are the ones that do the remote loading of files. This...