add-wps-doc-download-btn.user.js

// ==UserScript==
// @name         Add WPS document download shortcut button
// @namespace    https://greasyfork.org/en/users/85671-jcunews
// @version      1.0.1
// @license      AGPL v3
// @author       jcunews
// @description  Add a shortcut button for the Download function of the main menu onto the document share page and the document page.
// @match        https://*.docs.wps.com/l/*
// @match        https://*.docs.wps.com/module/common/loadPlatform/*
// @grant        none
// ==/UserScript==

(() => {
  function check(btn, container) {
    if (location.pathname.startsWith("/module/") && (btn = document.querySelector('.btn.open-browser'))) { //share page
      btn.insertAdjacentHTML("beforeend", `<button id=dlbtn style="float:right">Download</button>`);
      btn.lastChild.onclick = () => sessionStorage.download = 1
    } else if (location.pathname.startsWith("/l/") && (container = document.querySelector('.component-header-file-info>.file-name'))) { //document page
      container.insertAdjacentHTML("beforeend", `<button id=dlbtn style="margin-left:.5em;padding:0 .3em">Download</button>`);
      container.lastChild.onclick = () => {
        document.querySelector('#component-header-left .header-more-btn>button').click();
        (function waitmenu() {
          if (btn = document.querySelector('.file-more-panel .menu-text[data-key="Download"]')) {
            btn.click()
          } else setTimeout(waitmenu, 200)
        })()
      };
      if (sessionStorage.download) {
        delete sessionStorage.download;
        (function waitmenubtn() {
          if (btn = document.querySelector('#component-header-left .header-more-btn>button')) {
            dlbtn.click();
            if (!btn.matches('.is-selected')) setTimeout(waitmenubtn, 200)
          } else setTimeout(waitmenubtn, 200)
        })()
      }
    }
  }
  check();
  (new MutationObserver(recs => {
    if (!window.dlbtn && recs.some(rec => rec.addedNodes.length > 0)) check()
  })).observe(document.body, {childList: true, subtree: true})
})()