Preload description of BasicPlatformer

index.js

  function preload() {
          // Load the 'map.json' file using the TILDED_JSON special flag
          game.load.tilemap('map', 'assets/map.json', null, Phaser.Tilemap.TILED_JSON);
          
          // Load the image 'level.png' and associate it in the cache as 'level'
          game.load.image('level', 'assets/level.png');
          
          // Load the spritesheet 'character.png', telling Phaser each frame is 30x48
          game.load.spritesheet('character', 'assets/character.png', 30, 48);
        }