muicss/loadjs - простой маленький загрузчик
// define a dependency bundle
loadjs(['/path/to/foo.js', '/path/to/bar.js'], 'foobar');
// execute code elsewhere when the bundle has loaded
loadjs.ready('foobar', {
success: function() { /* foo.js & bar.js loaded */ },
error: function(depsNotFound) { /* foobar bundle load failed */ }
});https://github.com/muicss/loadjs