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ExEv

(Ex)tended (Ev)ents - provides an API for some missing on-x events

当前为 2020-05-23 提交的版本，查看 最新版本。

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/403996/808391/ExEv.js 

  1. // ==UserScript==
  2. // @name         ExEv
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.1.1
  5. // @description  (Ex)tended (Ev)ents - provides an API for some missing on-x events
  6. // @author       github.com/akuankka128
  7. // @match        http*://*/*
  8. // @grant        none
  9. // ==/UserScript==
  10.  
  11. /* jshint esversion: 6 */
  12.  
  13. (function(root) {
  14.     'use strict';
  15.  
  16.     let events = new Map();
  17.     events.on = (event, handler) => events.set(event, handler);
  18.     events.off = event => events.delete(event);
  19.     events.emit = (event, ...args) => {
  20.         let e = events.get(event);
  21.         if(!e) return false;
  22.         e(...args);
  23.         return true;
  24.     };
  25.  
  26.     root.events = events;
  27.  
  28.     let observer = new MutationObserver(function(mutations) {
  29.         mutations.forEach(m => {
  30.             if(m.target instanceof HTMLHeadElement) {
  31.                 events.emit('headloaded');
  32.                 events.off('headloaded');
  33.             } else if(m.target instanceof HTMLBodyElement) {
  34.                 events.emit('bodyloaded');
  35.                 events.off('bodyloaded');
  36.             }
  37.         });
  38.     });
  39.  
  40.     observer.observe(document, {childList:true,subtree:true});
  41. })(document);