sample_rails_tailwind/app/javascript/theme_switch.js

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JavaScript
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// 获取切换按钮
const themeToggle = document.querySelector('.theme-controller');
// 监听变化
themeToggle.addEventListener('change', (e) => {
// 切换 HTML data-theme 属性
if(e.target.checked) {
document.documentElement.setAttribute('data-theme', 'dark');
} else {
document.documentElement.setAttribute('data-theme', 'light');
}
// 保存主题设置到 localStorage
localStorage.setItem('theme', e.target.checked ? 'dark' : 'light');
});
// 页面加载时检查之前的主题设置
const savedTheme = localStorage.getItem('theme');
if(savedTheme) {
document.documentElement.setAttribute('data-theme', savedTheme);
themeToggle.checked = savedTheme === 'dark';
}