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CSS rules utilities

functions allowing to get the CSS rules applied to an element

当前为 2020-01-27 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/394970/768130/CSS%20rules%20utilities.js 

  1. // ==UserScript==
  2. // @name         CSS rules utilities
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.3
  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, frDoc) {
  26.     if (!frDoc) frDoc = window.document;
  27.     var elHover = "";
  28.     var sheets = frDoc.styleSheets;
  29.     if (el !== null) {
  30.         el.matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector || el.oMatchesSelector;
  31.         for (var sheet in sheets) {
  32.             var rules = sheets[sheet].rules || sheets[sheet].cssRules;
  33.             for (var rule in rules) {
  34.                 if (rules[rule].type === 1) {
  35.                     if (el.matches(rules[rule].selectorText)) {
  36.  
  37.                         let oldRulesList = rules[rule].style.cssText,
  38.                             oldRules = oldRulesList.split(";"),
  39.                             newRulesList = "";
  40.                         oldRules.pop();
  41.  
  42.                         for (let newProp in newRule.cssNormal) {
  43.                             el.style[newProp] = newRule.cssNormal[newProp];
  44.                             for (let oldRule of oldRules) {
  45.                                 oldRule = oldRule.trim();
  46.                                 let oldProp = oldRule.split(":")[0];
  47.                                 if (oldProp === newProp) {
  48.                                     newRulesList += newProp + ":" + newRule.cssNormal[newProp] + ";";
  49.                                     el.style[newProp] = newRule.cssNormal[newProp];
  50.                                 } else {
  51.                                     newRulesList += oldRule + ";";
  52.                                 };
  53.                             }
  54.                             rules[rule].style.cssText = newRulesList;
  55.                         }
  56.  
  57.                         if (typeof newRule.cssHover !== 'undefined') {
  58.                             var rul = "";
  59.                             for (let propHover in newRule.cssHover) {
  60.                                 rul += `${propHover}:${newRule.cssHover[propHover]} !important;`;
  61.                             };
  62.                             elHover = `${rules[rule].selectorText}:hover{${rul}}`;
  63.                         }
  64.                     } else {};
  65.                 }
  66.             }
  67.         }
  68.     }
  69.  
  70.     if (elHover !== "") {
  71.         let newHoverStyle = document.createElement('style'),
  72.             hoverRule = document.createTextNode(elHover);
  73.         newHoverStyle.appendChild(hoverRule);
  74.         document.head.appendChild(newHoverStyle)
  75.         //sheets[sheets.length - 1].insertRule(elHover);
  76.     };
  77. }