Import and export data using localForage in Tampermonkey script
// ==UserScript==
// @name Import Export Data
// @namespace https://github.com/Adachi-Git
// @version 1.01
// @description Import and export data using localForage in Tampermonkey script
// @author Adachi
// @match https://u2.dmhy.org/offers.php
// @match https://u2.dmhy.org/torrents.php*
// @include /^https?://(bangumi\.tv|bgm\.tv|chii\.in)/.*
// @grant none
// @require https://cdnjs.cloudflare.com/ajax/libs/localforage/1.10.0/localforage.min.js
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// 设置并发操作的上限
const MAX_CONCURRENT_OPERATIONS = 5;
// 创建导入按钮
const importButton = document.createElement('input');
importButton.type = 'file';
importButton.style.position = 'fixed';
importButton.style.top = '10px';
importButton.style.left = '10px';
document.body.appendChild(importButton);
// 创建导出按钮
const exportButton = document.createElement('button');
exportButton.textContent = 'Export Data';
exportButton.style.position = 'fixed';
exportButton.style.top = '40px';
exportButton.style.left = '10px';
document.body.appendChild(exportButton);
// 点击导入按钮时触发事件
importButton.addEventListener('change', async function(event) {
const file = event.target.files[0];
if (!file) return;
try {
const data = await readFile(file);
await importDataConcurrently(data);
alert('Data imported successfully!');
} catch (error) {
console.error('Error importing data:', error);
alert('Error importing data. See console for details.');
}
});
// 点击导出按钮时触发事件
exportButton.addEventListener('click', async function() {
try {
const data = await exportData();
downloadData(data);
} catch (error) {
console.error('Error exporting data:', error);
alert('Error exporting data. See console for details.');
}
});
// 读取文件并返回数据
function readFile(file) {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = () => resolve(reader.result);
reader.onerror = error => reject(error);
reader.readAsText(file);
});
}
// 并发导入数据到 IndexedDB
async function importDataConcurrently(data) {
const jsonData = JSON.parse(data);
const keys = Object.keys(jsonData);
// 切割任务，以 MAX_CONCURRENT_OPERATIONS 为一组进行并发操作
const chunks = [];
for (let i = 0; i < keys.length; i += MAX_CONCURRENT_OPERATIONS) {
chunks.push(keys.slice(i, i + MAX_CONCURRENT_OPERATIONS));
}
// 对每个组进行并发操作
for (const chunk of chunks) {
await Promise.all(chunk.map(async (key) => {
await localforage.setItem(key, jsonData[key]);
}));
}
}
// 导出数据
async function exportData() {
const keys = await localforage.keys();
const data = {};
for (const key of keys) {
data[key] = await localforage.getItem(key);
}
return JSON.stringify(data, null, 2);
}
// 下载数据为 JSON 文件
function downloadData(data) {
const blob = new Blob([data], { type: 'application/json' });
const url = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = 'indexedDB_data.json';
link.click();
}
})();