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Simple WaitForKeyElement

Library that Exports my simplified vanilla JS version of WaitForKeyElement, which is a simple async function that returns a Promise that resolves to an element by a given selector, when that element is found

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/511024/1460585/Simple%20WaitForKeyElement.js 

  1. // ==UserScript==
  2. // @name        Simple WaitForKeyElement
  3. // @license     Unlicense
  4. // @namespace   1N07
  5. // @match       *://*/*
  6. // @version     1.0.1
  7. // @author      1N07
  8. // @description Library that Exports my simplified vanilla JS version of WaitForKeyElement, which is a simple async function that returns a Promise that resolves to an element by a given selector, when that element is found
  9. // ==/UserScript==
  10.  
  11. async function WaitForKeyElement(selector, timeout) {
  12. 	return new Promise((resolve, reject) => {
  13. 		let el = document.querySelector(selector);
  14. 		if (el) {
  15. 			resolve(el);
  16. 			return;
  17. 		}
  18. 		new MutationObserver((mutationRecords, observer) => {
  19. 			el = document.querySelector(selector);
  20. 			if (el) {
  21. 				resolve(el);
  22. 				observer.disconnect();
  23. 			}
  24. 		}).observe(document.documentElement, { childList: true, subtree: true });
  25. 		if (timeout) {
  26. 			setTimeout(() => {
  27. 				reject(`WaitForKeyElement: "${selector}" timed out`);
  28. 			}, timeout);
  29. 		}
  30. 	});
  31. }