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保存页面

将页面保存为单个 HTML 文件。

当前为 2022-03-24 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name        Save Page
  3. // @name:zh-CN  保存页面
  4. // @description Save page as single HTML file.
  5. // @description:zh-CN 将页面保存为单个 HTML 文件。
  6. // @namespace   https://greasyfork.org/users/197529
  7. // @version     0.1.3
  8. // @author      kkocdko
  9. // @license     Unlicense
  10. // @match       *://*/*
  11. // @grant       GM_xmlhttpRequest
  12. // @noframes
  13. // ==/UserScript==
  14. "use strict";
  15.  
  16. const { addFloatButton, fetchex } = {
  17.   addFloatButton(text, onclick) /* 20220324-0950 */ {
  18.     if (!document.addFloatButton) {
  19.       const host = document.body.appendChild(document.createElement("div"));
  20.       const root = host.attachShadow({ mode: "open" });
  21.       root.innerHTML = `<style>:host{position:fixed;top:4px;left:4px;z-index:2147483647;height:0}#i{display:none}*{float:left;padding:1em;margin:4px;line-height:0;color:#fff;user-select:none;background:#28e;border:1px solid #fffa;border-radius:8px;transition:.3s}[for]~:active{background:#4af;transition:0s}:checked~*{opacity:.3;transform:translateY(-3em)}:checked+*{transform:translateY(3em)}</style><input id=i type=checkbox><label for=i>`;
  22.       document.addFloatButton = (text, onclick) => {
  23.         const el = document.createElement("label");
  24.         el.textContent = text;
  25.         el.addEventListener("click", onclick);
  26.         return root.appendChild(el);
  27.       };
  28.     }
  29.     return document.addFloatButton(text, onclick);
  30.   },
  31.   async fetchex(url, type) /* 20210904-1148 */ {
  32.     // @grant       GM_xmlhttpRequest
  33.     if (self.GM_xmlhttpRequest)
  34.       return new Promise((resolve, reject) => {
  35.         GM_xmlhttpRequest({
  36.           url,
  37.           responseType: type,
  38.           onload: (e) => resolve(e.response),
  39.           onerror: reject,
  40.         });
  41.       });
  42.     else return (await fetch(url))[type]();
  43.   },
  44. };
  45.  
  46. // TODO: Content Security Policy. Example: https://github.com/kkocdko/kblog
  47.  
  48. addFloatButton("Save page", async function () {
  49.   console.time("save page");
  50.   this.style.background = "#ff9800";
  51.   const interval = setInterval((o) => {
  52.     const suffix = ".".padStart((++o.i % 3) + 1, " ").padEnd(3, " ");
  53.     this.innerHTML = "Saving " + suffix.replace(/\s/g, "&nbsp;");
  54.   }, ...[333, { i: 0 }]); // 茴回囘囬
  55.  
  56.   const /** @type {Document} */ dom = document.cloneNode(true);
  57.  
  58.   const removeList = `script, style, source, title, link[rel=stylesheet], link[rel=alternate], link[rel=search], link[rel*=pre], link[rel*=icon]`;
  59.   dom.querySelectorAll(removeList).forEach((el) => el.remove());
  60.  
  61.   const qsam = (s, f) => [...document.querySelectorAll(s)].map(f);
  62.  
  63.   const imgs = dom.querySelectorAll("img");
  64.   const imgTasks = qsam("img", async (el, i) => {
  65.     const reader = new FileReader();
  66.     reader.readAsDataURL(await fetchex(el.currentSrc, "blob"));
  67.     await new Promise((r) => (reader.onload = reader.onerror = r));
  68.     imgs[i].src = reader.result;
  69.     imgs[i].srcset = "";
  70.   });
  71.  
  72.   const css = []; // Keep order
  73.   const cssTasks = qsam("style, link[rel=stylesheet]", async (el, i) => {
  74.     if (el.tagName === "STYLE") css[i] = el.textContent;
  75.     else css[i] = await fetchex(el.href, "text");
  76.   });
  77.  
  78.   await Promise.allSettled([...imgTasks, ...cssTasks]);
  79.  
  80.   // [TODO:Limitation] `url()` and `image-set()` in css will not be save
  81.   // Avoid the long-loading issue
  82.   const cssStr = css.join("\n").replace(/(url|image-set)(.+?)/g, "url()");
  83.   dom.head.appendChild(dom.createElement("style")).textContent = cssStr;
  84.  
  85.   // [TODO:Limitation] breaked some no-doctype / xhtml / html4 pages
  86.   const result = "<!DOCTYPE html>" + dom.documentElement.outerHTML;
  87.  
  88.   const link = document.createElement("a"); // Using `dom` will cause failure
  89.   link.download = `${document.title}_${Date.now()}.html`;
  90.   link.href = "data:text/html," + encodeURIComponent(result);
  91.   link.click();
  92.  
  93.   console.timeEnd("save page");
  94.  
  95.   clearInterval(interval);
  96.   this.textContent = "Page saved";
  97.   this.style.background = "#4caf50";
  98. });