use yii\web\AssetBundle;

/**

• Main frontend application asset bundle.
  */
  class AppAsset extends AssetBundle
  {
  public $basePath = '@webroot';
  public $baseUrl = '@web';
  public $css = [
  'css/site.css',];
  public $js = [
  'js/main.js',];
  public $depends = [
  'yii\web\YiiAsset','yii\bootstrap\BootstrapAsset',//注意这里必须要有
  'rmrevin\yii\fontawesome\AssetBundle',];
  }

use yii\web\AssetBundle;

/**

• Asset bundle for the Twitter bootstrap css files.
• @since 2.0
  */
  class BootstrapAsset extends AssetBundle
  {
  public $sourcePath = '@bower/bootstrap/dist';
  public $css = [
  'css/bootstrap.css',];
  //下面是增加的代码
  public $js = [
  'js/bootstrap.js',];
  }