在ZJU图书馆书目详情页面右上角添加一个悬浮按钮，通过豆瓣ISBN页面抓取评分数据。如果有评分数据，则显示“豆瓣评分8.8分”，否则显示“豆瓣暂无评分”。
// ==UserScript==
// @name ZJUlib2douban Enhanced
// @namespace https://github.com/AlainAlan/ZJUlib2douban/tree/main
// @version 0.4
// @description 在ZJU图书馆书目详情页面右上角添加一个悬浮按钮，通过豆瓣ISBN页面抓取评分数据。如果有评分数据，则显示“豆瓣评分8.8分”，否则显示“豆瓣暂无评分”。
// @author AlainAllen
// @match *://opac.zju.edu.cn/*
// @grant GM_xmlhttpRequest
// @connect douban.com
// @license MIT
// ==/UserScript==
(function () {
'use strict';
// Function to extract the last ISBN using regular expression
function extractLastISBN() {
var isbnRegex = /ISBN(?:-1[03])?:?\s*(\d{0,3}-?\d{1,5}-?\d{1,7}-?\d{1,7}-?[\dX])/g;
var bodyText = document.body.innerText;
var isbnMatches = [...bodyText.matchAll(isbnRegex)];
if (isbnMatches.length > 0) {
var lastIsbnMatch = isbnMatches[isbnMatches.length - 1];
return lastIsbnMatch[1]; // Capture group 1 contains the ISBN
} else {
return null;
}
}
// Function to fetch Douban rating by ISBN
function fetchDoubanRating(isbn, callback) {
const url = `https://douban.com/isbn/${isbn}/`;
GM_xmlhttpRequest({
method: "GET",
url: url,
onload: function (response) {
if (response.status === 200) {
const parser = new DOMParser();
const doc = parser.parseFromString(response.responseText, "text/html");
const ratingElement = doc.querySelector('.rating_num');
if (ratingElement && ratingElement.textContent.trim()) {
const rating = ratingElement.textContent.trim();
callback(null, rating);
} else {
callback(null, "暂无评分");
}
} else {
callback("Error fetching Douban rating");
}
},
onerror: function () {
callback("Error connecting to Douban");
}
});
}
// Function to create and append the floating button
function appendFloatingButton(text, isbn) {
const button = document.createElement('div');
button.style.position = 'fixed';
button.style.top = '20px';
button.style.right = '20px';
button.style.padding = '10px 15px';
button.style.backgroundColor = '#007722';
button.style.color = '#fff';
button.style.borderRadius = '5px';
button.style.boxShadow = '0 2px 5px rgba(0, 0, 0, 0.2)';
button.style.cursor = 'pointer';
button.style.zIndex = '9999';
button.style.fontSize = '14px';
button.textContent = text;
button.title = '点击查看豆瓣页面';
button.onclick = function () {
window.open(`http://douban.com/isbn/${isbn}/`, '_blank');
};
document.body.appendChild(button);
}
// Main function
window.addEventListener('load', function () {
const isbn = extractLastISBN();
if (isbn) {
fetchDoubanRating(isbn, function (error, rating) {
if (error) {
console.error(error);
appendFloatingButton("豆瓣暂无评分", isbn);
} else {
const text = rating === "暂无评分" ? "豆瓣暂无评分" : `豆瓣评分 ${rating}分`;
appendFloatingButton(text, isbn);
}
});
} else {
console.log('ISBN not found. Cannot create button.');
}
});
})();