安装yii2-百度编辑器：

php composer.phar require --prefer-dist crazydb/yii2-ueditor "*"

'controllerMap'=>[
        //'upload'=>'backend\components\UploadController',
        'ueditor' => [
            'class' => 'crazydb\ueditor\UEditorController',
        ]
    ],

<?= $form->field($model, 'content')->widget(\crazydb\ueditor\UEditor::className()) ?>

解决。奥利给