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Import Export Data

Import and export data using localForage in Tampermonkey script

当前为 2024-03-21 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Import Export Data
  3. // @namespace    https://github.com/Adachi-Git
  4. // @version      1.0
  5. // @description  Import and export data using localForage in Tampermonkey script
  6. // @author       Adachi
  7. // @match        https://u2.dmhy.org/offers.php
  8. // @match        https://u2.dmhy.org/torrents.php*
  9. // @match       /^https?://(bangumi\.tv|bgm\.tv|chii\.in)/.*
  10. // @grant        none
  11. // @require      https://cdnjs.cloudflare.com/ajax/libs/localforage/1.10.0/localforage.min.js
  12. // @license MIT
  13. // ==/UserScript==
  14.  
  15. (function() {
  16.     'use strict';
  17.  
  18.     // 设置并发操作的上限
  19.     const MAX_CONCURRENT_OPERATIONS = 5;
  20.  
  21.     // 创建导入按钮
  22.     const importButton = document.createElement('input');
  23.     importButton.type = 'file';
  24.     importButton.style.position = 'fixed';
  25.     importButton.style.top = '10px';
  26.     importButton.style.left = '10px';
  27.     document.body.appendChild(importButton);
  28.  
  29.     // 创建导出按钮
  30.     const exportButton = document.createElement('button');
  31.     exportButton.textContent = 'Export Data';
  32.     exportButton.style.position = 'fixed';
  33.     exportButton.style.top = '40px';
  34.     exportButton.style.left = '10px';
  35.     document.body.appendChild(exportButton);
  36.  
  37.     // 点击导入按钮时触发事件
  38.     importButton.addEventListener('change', async function(event) {
  39.         const file = event.target.files[0];
  40.         if (!file) return;
  41.  
  42.         try {
  43.             const data = await readFile(file);
  44.             await importDataConcurrently(data);
  45.             alert('Data imported successfully!');
  46.         } catch (error) {
  47.             console.error('Error importing data:', error);
  48.             alert('Error importing data. See console for details.');
  49.         }
  50.     });
  51.  
  52.     // 点击导出按钮时触发事件
  53.     exportButton.addEventListener('click', async function() {
  54.         try {
  55.             const data = await exportData();
  56.             downloadData(data);
  57.         } catch (error) {
  58.             console.error('Error exporting data:', error);
  59.             alert('Error exporting data. See console for details.');
  60.         }
  61.     });
  62.  
  63.     // 读取文件并返回数据
  64.     function readFile(file) {
  65.         return new Promise((resolve, reject) => {
  66.             const reader = new FileReader();
  67.             reader.onload = () => resolve(reader.result);
  68.             reader.onerror = error => reject(error);
  69.             reader.readAsText(file);
  70.         });
  71.     }
  72.  
  73.     // 并发导入数据到 IndexedDB
  74.     async function importDataConcurrently(data) {
  75.         const jsonData = JSON.parse(data);
  76.         const keys = Object.keys(jsonData);
  77.  
  78.         // 切割任务，以 MAX_CONCURRENT_OPERATIONS 为一组进行并发操作
  79.         const chunks = [];
  80.         for (let i = 0; i < keys.length; i += MAX_CONCURRENT_OPERATIONS) {
  81.             chunks.push(keys.slice(i, i + MAX_CONCURRENT_OPERATIONS));
  82.         }
  83.  
  84.         // 对每个组进行并发操作
  85.         for (const chunk of chunks) {
  86.             await Promise.all(chunk.map(async (key) => {
  87.                 await localforage.setItem(key, jsonData[key]);
  88.             }));
  89.         }
  90.     }
  91.  
  92.     // 导出数据
  93.     async function exportData() {
  94.         const keys = await localforage.keys();
  95.         const data = {};
  96.         for (const key of keys) {
  97.             data[key] = await localforage.getItem(key);
  98.         }
  99.         return JSON.stringify(data, null, 2);
  100.     }
  101.  
  102.     // 下载数据为 JSON 文件
  103.     function downloadData(data) {
  104.         const blob = new Blob([data], { type: 'application/json' });
  105.         const url = URL.createObjectURL(blob);
  106.         const link = document.createElement('a');
  107.         link.href = url;
  108.         link.download = 'indexedDB_data.json';
  109.         link.click();
  110.     }
  111. })();