dark-theme/index.html at main · cccchuck/dark-theme · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>浅谈 Web Dark Theme</title>
    <link rel="stylesheet" href="index.css" />
  </head>
  <body>
    <h1>👋🏻 你好啊, 我是 Chuck !</h1>
    <p>在本文中我将逐步带你去实现我们的需求，不用害怕，这其实很简单。</p>
    <button id="toggle">切换模式</button>
  </body>

  <script>
    (function () {
      const lightTheme = {
        "--color-bg": "#fffffe",
        "--color-heading": "#232946",
        "--color-content": "var(--color-heading)",
        "--color-bg-btn": "#232946",
        "--color-text-btn": "#b8c1ec",
      };

      const darkTheme = {
        "--color-bg": "#232946",
        "--color-heading": "#fffffe",
        "--color-content": "#b8c1ec",
        "--color-bg-btn": "#eebbc3",
        "--color-text-btn": "#232946",
      };

      function setTheme(isDark) {
        if (isDark) {
          Object.keys(darkTheme).forEach((key) => {
            document.documentElement.style.setProperty(key, darkTheme[key]);
          });
        } else {
          Object.keys(lightTheme).forEach((key) => {
            document.documentElement.style.setProperty(key, lightTheme[key]);
          });
        }
      }

      function init() {
        let isDark = localStorage.getItem("isDark");
        if (isDark !== null) {
          isDark = JSON.parse(isDark);
          setTheme(isDark);
        }

        const btn = document.querySelector("#toggle");
        btn.addEventListener("click", () => {
          isDark = !isDark;
          setTheme(isDark);
          localStorage.setItem("isDark", isDark);
        });
      }

      init();
    })();
  </script>
</html>