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CSS rules utilities

functions allowing to get the CSS rules applied to an element

目前为 2020-01-15 提交的版本。查看 最新版本。

此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/394970/765728/CSS%20rules%20utilities.js 

  1. // ==UserScript==
  2. // @name         CSS rules utilities
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.2
  5. // @description  functions allowing to get the CSS rules applied to an element
  6. // @author       CoStiC
  7. // @match        *://*/*
  8. // @grant        none
  9. // ==/UserScript==
  10.  
  11. function findCssRules(el) {
  12.     var sheets = document.styleSheets, ret = [];
  13.     el.matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector || el.oMatchesSelector;
  14.     for (var i in sheets) {
  15.         var rules = sheets[i].rules || sheets[i].cssRules;
  16.         for (var r in rules) {
  17.             if (el.matches(rules[r].selectorText)) {
  18.                 ret.push(rules[r].cssText);
  19.             }
  20.         }
  21.     }
  22.     return ret;
  23. }
  24.  
  25. function modCssRules(el, newRule) {
  26.     var elHover = "";
  27.     var sheets = document.styleSheets;
  28.     if (el !== null) {
  29.         el.matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector || el.oMatchesSelector;
  30.         for (var sheet in sheets) {
  31.             var rules = sheets[sheet].rules || sheets[sheet].cssRules;
  32.             for (var rule in rules) {
  33.                 if (el.matches(rules[rule].selectorText)) {
  34.  
  35.                     for (let prop in newRule.cssNormal) { rules[rule].style[prop] = newRule.cssNormal[prop] }
  36.                     if (typeof newRule.cssHover !== 'undefined') {
  37.                         var rul = "";
  38.                         for (let propHover in newRule.cssHover) {
  39.                             rul += `${propHover}:${newRule.cssHover[propHover]} !important;`;
  40.                         };
  41.                         elHover = `${rules[rule].selectorText}:hover{${rul}}`;
  42.                     }
  43.                 } else {};
  44.             }
  45.         }
  46.     }
  47.  
  48.     if (elHover !== "") {
  49.         let newHoverStyle = document.createElement('style'),
  50.             hoverRule = document.createTextNode(elHover);
  51.         newHoverStyle.appendChild(hoverRule);
  52.         document.head.appendChild(newHoverStyle)
  53.         //sheets[sheets.length - 1].insertRule(elHover);
  54.     };
  55. }