src/PHPDish/Component/Pjax/EventListener/KernelResponseListener.php
protected function fetchBody(Crawler $crawler, $container)
    {
        $content = $crawler->filter($container);
        if ($content->count() == 0) {
            return '';
        }
        return $content->html();
    }
protected function fetchBody(Crawler $crawler, $container)
    {
        $content = $crawler->filter($container);
        if ($content->count() == 0) {
            return '';
        }
        return $content->html();
    }
提取 body
@param Crawler $crawler
@param $container
@return string