☰

background-color

Change the white elements to green for protecting your eyes!

当前为 2018-12-05 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         background-color
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.8.2
  5. // @description  Change the white elements to green for protecting your eyes!
  6. // @author       developerdong
  7. // @match        http*://*/*
  8. // @grant        none
  9. // ==/UserScript==
  10. (function () {
  11.     "use strict";
  12.  
  13.     function toHex(N) {
  14.         if (N == null) return "00";
  15.         N = parseInt(N);
  16.         if (N === 0 || isNaN(N)) return "00";
  17.         N = Math.max(0, N);
  18.         N = Math.min(N, 255);
  19.         N = Math.round(N);
  20.         // return "0123456789abcdef".charAt((N - N % 16) / 16) + "0123456789abcdef".charAt(N % 16); // Lower case
  21.         return "0123456789ABCDEF".charAt((N - N % 16) / 16) + "0123456789ABCDEF".charAt(N % 16); // Upper case
  22.     }
  23.  
  24.     /**
  25.      * Transform RGB or RGBA color to HEX color
  26.      * @return {string}
  27.      */
  28.     function RGBAtoHEX(str) {
  29.         const leftParenthesisIndex = str.indexOf('(');
  30.         const rightParenthesisIndex = str.indexOf(')');
  31.         const colorFormat = str.substring(0, leftParenthesisIndex);
  32.         const colorValueArray = str.substring(leftParenthesisIndex + 1, rightParenthesisIndex).split(',');
  33.         if (colorFormat === "rgba" && parseFloat(colorValueArray[3]) !== 1) {
  34.             return "TRANSPARENT";
  35.         } else if (colorFormat === "rgba" || colorFormat === "rgb") {
  36.             const r = colorValueArray[0].trim(), g = colorValueArray[1].trim(), b = colorValueArray[2].trim();
  37.             const hex = [toHex(r), toHex(g), toHex(b)];
  38.             return '#' + hex.join('');
  39.         } else {
  40.             return str;
  41.         }
  42.     }
  43.  
  44.     /**
  45.      * Change the background color of all sub elements by level order
  46.      */
  47.     function changeBackgroundColor(node) {
  48.         const queue = [];
  49.         while (node) {
  50.             // nodeType === 1 means the node is an element
  51.             if (node.nodeType === 1) {
  52.                 const nodeStyle = window.getComputedStyle(node);
  53.                 const hexColor = RGBAtoHEX(nodeStyle.backgroundColor);
  54.                 // nodeStyle.cursor !== "pointer" means the node is non-clickable
  55.                 if ((node === document.body && hexColor === "TRANSPARENT") || (hexColor === "#FFFFFF" && nodeStyle.cursor !== "pointer")) {
  56.                     node.style.setProperty("background-color", "#C1E6C6", "important");
  57.                 }
  58.                 Array.from(node.children).forEach(function (child) {
  59.                     queue.push(child);
  60.                 });
  61.             }
  62.             node = queue.shift();
  63.         }
  64.     }
  65.  
  66.     // Change the background color of newly added elements
  67.     const observer = new MutationObserver(function (records) {
  68.         records.map(function (record) {
  69.             if (record.type === "childList") {
  70.                 record.addedNodes.forEach(changeBackgroundColor);
  71.             }
  72.         });
  73.     });
  74.     const option = {
  75.         "childList": true,
  76.         "subtree": true
  77.     };
  78.     observer.observe(document.body, option);
  79.  
  80.     // Change the background color of initially loaded elements
  81.     changeBackgroundColor(document.body);
  82.  
  83. })();