工作方式

先用PHP作为接口将Feed转换为Json，再由Js输出为HTML。

接口部分PHP

<?php
$feedParam = isset($_GET['feed'])? explode(',', $_GET['feed']) : [];

$rssSources = [];
if (!empty($feedParam)) {
    $rssSources = array_map(function ($feed) {
        return $feed. 'feed/';
    }, $feedParam);
}

if (!empty($rssSources)) {
    $allItems = array_reduce($rssSources, function ($carry, $source) {
        $rss = simplexml_load_file($source);
        foreach ($rss->channel->item as $item) {
            $carry[] = [
                'title' => (string)$item->title,
                'description' => (string)$item->description,
                'link' => (string)$item->link,
                'pubDate' => (string)$item->pubDate,
                'creator' => (string)$item->children('http://purl.org/dc/elements/1.1/')->creator,
            ];
        }
        return $carry;
    }, []);


    usort($allItems, fn($a, $b) => strtotime($b['pubDate']) - strtotime($a['pubDate']));


    header('Content-Type: application/json');
    echo json_encode(['items' => $allItems]);
} else {
    header('Content-Type: application/json');
    echo json_encode(['description' => 'No valid feed sources provided']);
}
?>

主题自定义页面部分

<div id="FeedLoader">正在加载中…<br>若长时间无响应，请尝试刷新页面</div>
<script>
    document.addEventListener('DOMContentLoaded', function() {
        const container = document.getElementById('FeedLoader');
        fetch('https://i.eastblues.cn/feed.php?feed=https://i.eastblues.cn/feed/,URL2,URL3')
            .then(response => response.json())
            .then(data => {
                container.innerHTML = '';
                data.items.forEach(({ title, creator, pubDate, description, link }) => {
                    container.innerHTML += `
                        <h3>${title}</h3>
                        <p>作者：${creator}</p>
                        <p>发布日期：${pubDate}</p>
                        <p>${description}</p>
                        <p><a href="${link}" target="_blank">查看详情</a></p>
                        <hr>
                    `;
                });
            })
            .catch(error => {
                container.innerHTML = `<p>数据获取失败！</p>`;
            });
    });
</script>