为什么没有缩略图？ 你需要编辑文章的时候添加特色图片，这样才会显示在列表的缩略图中；

也就是说不设置特色图片，首页就显示默认的图片。这在主题说明里面已经详细说明啦，亲们，你们不要纠结了，dux主题如何设置如何实现Dux主题文章不设置特色图片或者文章使用外链图片时显示随机缩略图？

用记事本打开 functions.php文件，重新定义_get_post_thumbnail函数，修改如下

<?php
// Require theme functions
require get_stylesheet_directory() . ‘/inc/fn.php’;

// Customize your functions

function _get_post_thumbnail($size = ‘thumbnail’, $class = ‘thumb’) {
$html = ”;
if (has_post_thumbnail()) {

#$domsxe = simplexml_load_string(get_the_post_thumbnail());
/*$src = $domsxe->attributes()->src;

$src_array = wp_get_attachment_image_src(_get_attachment_id_from_src($src), $size);
$html = sprintf(‘<img data-src=”%s” class=”%s”/>’, $src_array[0], $class);*/
$domsxe = get_the_post_thumbnail();
// print_r(“1.2 domsxe = $domsxe <br>”);
if(preg_match_all(‘/<img.*?(?: |\\t|\\r|\\n)?src=[\'”]?(.+?)[\'”]?(?:(?: |\\t|\\r|\\n)+.*?)?>/sim’, $domsxe, $strResult, PREG_PATTERN_ORDER)){
$images = $strResult[1];
foreach($images as $src){
// echo “1.2 $src <br>”;
$html = sprintf(‘<img data-src=”%s” class=”thumb”>’, $src);
break;
}
}
else
{
$html = sprintf(‘<img data-src=”%s” class=”thumb”>’, $domsxe);
}

} else {
$random = mt_rand(1,10);
$html = sprintf(‘<img data-src=”%s” class=”%s”>’, ‘http://xxxxx.baidu.com/xxxee2%2FFeatured-image%2Frandom%2F’.$random.’.jpg’, $class);
}

return $html;
}

return $html;
}

打开 fn.php 文件，屏蔽掉掉DUX 1.3原来的_get_post_thumbnail函数，否则会有函数重定义的错误提示。

/*

function _get_post_thumbnail($size = ‘thumbnail’, $class = ‘thumb’) {
$html = ”;
if (has_post_thumbnail()) {

#$domsxe = simplexml_load_string(get_the_post_thumbnail());
/*$src = $domsxe->attributes()->src;

$src_array = wp_get_attachment_image_src(_get_attachment_id_from_src($src), $size);
$html = sprintf(‘<img data-src=”%s” class=”%s”/>’, $src_array[0], $class);*/

$domsxe = get_the_post_thumbnail();
// print_r($domsxe);
preg_match_all(‘/<img.*?(?: |\\t|\\r|\\n)?src=[\'”]?(.+?)[\'”]?(?:(?: |\\t|\\r|\\n)+.*?)?>/sim’, $domsxe, $strResult, PREG_PATTERN_ORDER);
$images = $strResult[1];
foreach($images as $src){
$html = sprintf(‘<img data-src=”%s” class=”thumb”>’, $src);
break;
}

} else {
$html = sprintf(‘<img data-src=”%s” class=”%s”>’, get_stylesheet_directory_uri() . ‘/img/thumbnail.png’, $class);
}

return $html;
}

*/

function fifu_replace($html, $post_id) {
$image_url = get_post_meta($post_id, ‘fifu_image_url’, true);

if ($image_url) {
// echo “2.1image_url = $image_url <br>”;
//支持DUX.1.3的特征图像预览 20151215 —
if(preg_match_all(‘/<img.*?(?: |\\t|\\r|\\n)?src=[\'”]?(.+?)[\'”]?(?:(?: |\\t|\\r|\\n)+.*?)?>/sim’, $html, $strResult, PREG_PATTERN_ORDER)){
//匹配到
$images = $strResult[1];
foreach($images as $src){
$html = str_replace($src,$image_url,$html);
break;
}
}
else{
//没有匹配到
$html = $image_url;
}
/*
$html = fifu_get_html($post_id, $image_url);
if (get_option(‘fifu_backlink’) == ‘toggleon’)
include ‘html/backlink.html’;
*/

}
return $html;
}