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const BACKGROUNDS = {
home: { light: {}, dark: {} },
post: { light: {}, dark: {} },
archive: { light: {}, dark: {} },
category: { light: {}, dark: {} },
tag: { light: {}, dark: {} },
about: { light: {}, dark: {} },
links: { light: {}, dark: {} },
default: { light: {}, dark: {} }
};
for (const page in BACKGROUNDS) {
BACKGROUNDS[page].light.desktop = `var(--${page}-bg-image-light)`;
BACKGROUNDS[page].light.mobile = `var(--${page}-bg-image-light-mobile)`;
BACKGROUNDS[page].dark.desktop = `var(--${page}-bg-image-dark)`;
BACKGROUNDS[page].dark.mobile = `var(--${page}-bg-image-dark-mobile)`;
}
let cachedThemeMode = null;
let cachedPageType = null;
let cachedIsMobile = null;
let webBgElement = null;
let updateTimeout = null;
function detectThemeMode() {
const storedTheme = localStorage.getItem('Fluid_Color_Scheme');
const isDarkClass = document.body.classList.contains('dark-mode') ||
document.body.classList.contains('dark') ||
document.documentElement.classList.contains('dark');
const prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
return (storedTheme === 'dark' || (storedTheme === null && isDarkClass) ||
(storedTheme === null && !isDarkClass && prefersDark)) ? 'dark' : 'light';
}
function detectPageType() {
const path = window.location.pathname;
const bodyClasses = document.body.classList;
if (path === '/' || path === '/index.html') return 'home';
if (path.includes('/post/') || path.includes('/posts/') || path.includes('/article/')) return 'post';
if (path.includes('/archives/') || path.includes('/archive/')) return 'archive';
if (path.includes('/categories/') || path.includes('/category/')) return 'category';
if (path.includes('/tags/') || path.includes('/tag/')) return 'tag';
if (path.includes('/about/')) return 'about';
if (path.includes('/links/')) return 'links';
if (bodyClasses.contains('index')) return 'home';
if (bodyClasses.contains('post-template') || bodyClasses.contains('post')) return 'post';
if (bodyClasses.contains('archive-template') || bodyClasses.contains('archive')) return 'archive';
if (bodyClasses.contains('category-template') || bodyClasses.contains('category')) return 'category';
if (bodyClasses.contains('tag-template') || bodyClasses.contains('tag')) return 'tag';
if (bodyClasses.contains('about-template') || bodyClasses.contains('about')) return 'about';
if (bodyClasses.contains('links-template') || bodyClasses.contains('links')) return 'links';
if (document.querySelector('.post-content')) return 'post';
if (document.querySelector('.archive-list')) return 'archive';
if (document.querySelector('.category-list')) return 'category';
if (document.querySelector('.tag-list')) return 'tag';
if (document.querySelector('.about-content')) return 'about';
if (document.querySelector('.links-list')) return 'links';
return 'default';
}
function updateBackgroundImage() {
if (updateTimeout) {
clearTimeout(updateTimeout);
}
updateTimeout = setTimeout(() => {
const themeMode = detectThemeMode();
const pageType = detectPageType();
const isMobile = window.innerWidth < 768;
if (!webBgElement) {
webBgElement = document.querySelector('#web_bg');
if (!webBgElement) return;
}
if (themeMode !== cachedThemeMode ||
pageType !== cachedPageType ||
isMobile !== cachedIsMobile) {
cachedThemeMode = themeMode;
cachedPageType = pageType;
cachedIsMobile = isMobile;
const bgConfig = BACKGROUNDS[pageType] || BACKGROUNDS.default;
const bgImage = isMobile ? bgConfig[themeMode].mobile : bgConfig[themeMode].desktop;
webBgElement.style.backgroundImage = bgImage;
const banner = document.querySelector("#banner");
const mask = document.querySelector("#banner .mask");
if (banner) banner.style.backgroundImage = 'none';
if (mask) mask.style.backgroundColor = 'rgba(0,0,0,0)';
}
updateTimeout = null;
}, 50);
}
function init() {
updateBackgroundImage();
const themeToggleBtn = document.querySelector('#color-toggle-btn');
if (themeToggleBtn) {
themeToggleBtn.addEventListener('click', updateBackgroundImage);
}
window.addEventListener('storage', (event) => {
if (event.key === 'Fluid_Color_Scheme') {
updateBackgroundImage();
}
});
const observer = new MutationObserver((mutations) => {
for (const mutation of mutations) {
if (mutation.attributeName === 'class') {
updateBackgroundImage();
break;
}
}
});
observer.observe(document.body, { attributes: true });
observer.observe(document.documentElement, { attributes: true });
const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
mediaQuery.addEventListener('change', updateBackgroundImage);
window.addEventListener('resize', updateBackgroundImage, { passive: true });
document.addEventListener('click', (event) => {
const target = event.target.closest('a');
if (target && target.href && target.href.includes(window.location.hostname)) {
setTimeout(updateBackgroundImage, 100);
}
});
window.addEventListener('popstate', () => {
setTimeout(updateBackgroundImage, 100);
});
const contentObserver = new MutationObserver((mutations) => {
if (mutations.some(mutation =>
mutation.type === 'childList' &&
(mutation.addedNodes.length > 3 || mutation.removedNodes.length > 3)
)) {
setTimeout(updateBackgroundImage, 100);
}
});
const contentAreas = [
document.querySelector('main'),
document.querySelector('#main'),
document.querySelector('.container'),
document.querySelector('.content')
].filter(Boolean);
contentAreas.forEach(area => {
contentObserver.observe(area, {
childList: true,
subtree: true
});
});
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
init();
}
window.updatePageBackground = function() {
updateBackgroundImage();
return `已手动更新背景，页面类型: ${detectPageType()}, 主题模式: ${detectThemeMode()}`;
};
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