use pdima88\phpassets\Assets;
...
Assets::add('bootstrap');    // include asset library, defined in Assets::$libs
Assets::add('css/main.css'); // include single css file
Assets::add('js/script.js'); // include single js file
// or all at once:
Assets::add([
 'bootstrap',
 'css/main.js',
 'js/script.js'
]);

在模板中输出js和css标签

Assets::getCss(); // put this inside <head> ... </head> to output styles tags
Assets::getJs(); // put this in the end of page before </body> to output js script tags