您需要检索图片资源，然后获取图片网址

You need to retrieve the image resource, then get the image url

$_image = $_post->getFeaturedImage();

echo $_image->getAvailableImage();

看看Fishpig/Wordpress/Model/Image.php了解更多的url方法:

Take a look at Fishpig/Wordpress/Model/Image.php for more url methods:

public function getThumbnailImage()
public function getMediumImage()
public function getLargeImage()
public function getFullSizeImage()
public function getPostThumbnailImage()
public function getAvailableImage()
public function getImageByType($type = 'thumbnail')