background.js

// 插件安装时的初始化
chrome.runtime.onInstalled.addListener(() => {
    console.log('网页图片幻灯片插件已安装');
    // 设置默认配置（interval单位为秒）
    chrome.storage.sync.set({
        interval: 3,
        order: 'sequential'
    });
});

// 监听来自content script的消息
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
    if (request.action === 'DOWNLOAD_IMAGE') {
        chrome.downloads.download({
            url: request.url,
            filename: request.filename,
            conflictAction: 'uniquify',
            saveAs: false
        }, (downloadId) => {
            if (chrome.runtime.lastError) {
                console.error('Download failed:', chrome.runtime.lastError);
                sendResponse({ success: false, error: chrome.runtime.lastError.message });
            } else {
                sendResponse({ success: true, downloadId: downloadId });
            }
        });
        return true; // 保持消息通道开启，以便异步发送响应
    }
});