前言

需要用油猴采集并下载一个网站的图片，直接下下不了，搜了一下，是禁止跨域，使用CORS Unblock也不行，所以使用油猴自带的GM_xmlhttpRequest发送跨域请求。

项目

目标网站

代码编写

代码仅作为学习使用，禁止商用。

// ==UserScript==
// @name         ***** Image Downloader and Zipper with GM_xmlhttpRequest
// @namespace    http://tampermonkey.net/
// @version      1.7
// @description  Download all matching product images as a zip file from the **** product page using GM_xmlhttpRequest (For learning purposes only)
// @author       slowfeather@163.com
// @match        
// @icon         
// @grant        GM_xmlhttpRequest
// @grant        GM_download
// @require      https://cdnjs.cloudflare.com/ajax/libs/jszip/3.7.1/jszip.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.5/FileSaver.min.js
// ==/UserScript==

(function() {
    'use strict';

    // List to store image URLs
    let imageUrls = new Set();

    // Function to periodically collect image URLs
    function collectImageUrls() {
        const imageElements = document.querySelectorAll('img');
        const regex1 = /*****\.com\/package-screenshot\/.+?_scaled\.jpg$/;
        const regex2 = /*****\.****\.com\/key-image\/.+?\.jpg$/;

        imageElements.forEach((img) => {
            const url = img.src;
            if ((regex1.test(url) || regex2.test(url)) && !imageUrls.has(url)) {
                imageUrls.add(url);
                showNotification('捕获了一张图片地址 :'+url);
            }
        });
    }

    // Function to show notification
    function showNotification(message) {
        const notification = document.createElement('div');
        notification.innerText = message;
        notification.style.position = 'fixed';
        notification.style.top = '50px';
        notification.style.right = '10px';
        notification.style.zIndex = 1000;
        notification.style.backgroundColor = 'lightgreen';
        notification.style.padding = '5px';
        notification.style.border = '1px solid green';
        notification.style.borderRadius = '5px';
        document.body.appendChild(notification);

        setTimeout(() => {
            document.body.removeChild(notification);
        }, 1000);
    }

    // Set an interval to collect image URLs every second
    setInterval(collectImageUrls, 300);

    // Function to download all images in the list and zip them
    async function downloadAndZipImages() {
        const zip = new JSZip();
        let count = 0;

        const fetchImage = (url, filename) => {
            return new Promise((resolve, reject) => {
                GM_xmlhttpRequest({
                    method: 'GET',
                    url: url,
                    responseType: 'blob',
                    onload: function(response) {
                        if (response.status === 200) {
                            zip.file(filename, response.response);
                            count++;
                            resolve();
                        } else {
                            reject(`HTTP error! status: ${response.status}`);
                        }
                    },
                    onerror: function(error) {
                        reject(`Failed to fetch image ${url}: ${error}`);
                    }
                });
            });
        };

        const fetchPromises = Array.from(imageUrls).map((url, index) => {
            const filename = `image_${index + 1}.jpg`;
            return fetchImage(url, filename);
        });

        try {
            await Promise.all(fetchPromises);
            if (count > 0) {
                const content = await zip.generateAsync({ type: "blob" });
                saveAs(content, "images.zip");
            } else {
                alert("No matching images found.");
            }
        } catch (error) {
            console.error(error);
        }
    }

    // Wait for the page to fully load
    window.addEventListener('load', () => {
        // Create a button to trigger the download
        const button = document.createElement('button');
        button.innerText = 'Download All Images as Zip';
        button.style.position = 'fixed';
        button.style.top = '10px';
        button.style.right = '10px';
        button.style.zIndex = 1000;
        button.addEventListener('click', downloadAndZipImages);
        document.body.appendChild(button);
    });
})();

运行效果