Don，

您必须在函数中添加对缩略图的支持。php/插件文件。php

//Add Support for Thumbs
if ( function_exists( \'add_theme_support\' ) ) {
  add_theme_support( \'post-thumbnails\' );
        set_post_thumbnail_size( 960, 276, true ); // default Post Thumbnail dimensions   
}
//Add Thumbnail sizes   
if ( function_exists( \'add_image_size\' ) ) { 
  add_image_size( \'large-thumb\', 960, 276, true ); //960 pixels wide x 276 height and cropping
  add_image_size( \'medium-thumb\', 605, 174 ); //No crop
  add_image_size( \'small-thumb\', 288, 83, true ); 
}

从这里，您可以修改循环中的此输出，以满足您的需要：

<?php if ( has_post_thumbnail() ) {

          echo \'<a href="\' . get_permalink( $post->ID ) . \'" title="\' . esc_attr( $post->post_title ) . \'">\';
          echo get_the_post_thumbnail($thumbnail->ID, \'small-thumb\', array( \'alt\' => esc_attr( $post->post_title ), \'title\' => esc_attr( $post->post_title ) ));
          echo \'</a>\';  //Change the \'small-thumb\' to whichever size you would like.
          } 

希望这能帮助你弄清楚你在做什么-如果你需要任何帮助来构建这个查询，我建议你调查一下this page.