function AssetLoader(manifest, loader) {
  this.assets = loadAssets(manifest, loader, function(err) {
    if (err) {
      console.error(err);
    }
  });
}
function AssetLoader(manifest, loader) {
  this.assets = loadAssets(manifest, loader, function(err) {
    if (err) {
      console.error(err);
    }
  });
}
function AssetLoader ( manifest , loader ) { this . assets = loadAssets ( manifest , loader , function ( err ) { if ( err ) { console . error ( err ) ; } } ) ; }
Loads external assets, lets you track their progress, and lets you access the loaded data.
@constructor
Loads external assets lets you track their progress and lets you access the loaded data .