// ==UserScript==
// @name         微信公众号文章封面下载
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  微信公众号文章封面下载。
// @author       laisheng
// @match        https://mp.weixin.qq.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=qq.com
// @grant        none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
var metaContentElement = document.getElementById('meta_content_hide_info');
var newTag = document.createElement('span');
newTag.style.position = 'initial';
newTag.style.right = '10px';
newTag.style.top = '10px';
newTag.style.backgroundColor = '#4CAF50';
newTag.style.color = '#fff';
newTag.style.padding = '5px';
newTag.style.borderRadius = '5px';
newTag.style.cursor = 'pointer';
newTag.style.fontSize = '12px';
newTag.textContent = '下载封面图片';
newTag.onclick = function() {
var ogImageMeta = document.querySelector('meta[property="og:image"]');
var ogTitleMeta = document.querySelector('meta[property="og:title"]');
if (ogImageMeta) {
var imageUrl = ogImageMeta.content;
var fileName = getValidFileName(ogTitleMeta ? ogTitleMeta.content : null);
fetchAndDownloadImage(imageUrl, fileName);
} else {
alert('没有找到og:image标签');
}
};
metaContentElement.parentNode.insertBefore(newTag, metaContentElement.nextSibling);
function getValidFileName(ogTitle) {
if (ogTitle && ogTitle.trim().length > 0) {
return ogTitle.trim();
}
return 'cover_image';
}
function fetchAndDownloadImage(url, fileName) {
fetch(url)
.then(response => response.blob())
.then(blob => {
const blobUrl = window.URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = blobUrl;
a.download = fileName;
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
window.URL.revokeObjectURL(blobUrl);
})
.catch(error => console.error('Error downloading image:', error));
}
})();