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| // 响应式设计管理器
class ResponsiveManager {
constructor() {
this.breakpoints = {
mobile: 320,
tablet: 768,
desktop: 1024,
wide: 1440
};
this.currentBreakpoint = this.getCurrentBreakpoint();
this.listeners = [];
this.init();
}
// 初始化
init() {
// 监听窗口大小变化
this.setupResizeObserver();
this.setupMediaQueryListeners();
// 初始化事件
this.emit('breakpoint-change', this.currentBreakpoint);
}
// 获取当前断点
getCurrentBreakpoint() {
const width = window.innerWidth;
for (const [name, minWidth] of Object.entries(this.breakpoints).reverse()) {
if (width >= minWidth) {
return name;
}
}
return 'mobile';
}
// 设置ResizeObserver
setupResizeObserver() {
let resizeTimer;
window.addEventListener('resize', () => {
clearTimeout(resizeTimer);
resizeTimer = setTimeout(() => {
this.handleResize();
}, 100);
});
}
// 处理窗口大小变化
handleResize() {
const newBreakpoint = this.getCurrentBreakpoint();
if (newBreakpoint !== this.currentBreakpoint) {
const oldBreakpoint = this.currentBreakpoint;
this.currentBreakpoint = newBreakpoint;
this.emit('breakpoint-change', {
from: oldBreakpoint,
to: newBreakpoint
});
}
}
// 设置媒体查询监听器
setupMediaQueryListeners() {
Object.entries(this.breakpoints).forEach(([name, minWidth]) => {
const mediaQuery = window.matchMedia(`(min-width: ${minWidth}px)`);
mediaQuery.addListener((e) => {
this.emit('media-query-change', {
breakpoint: name,
matches: e.matches,
width: window.innerWidth
});
});
});
}
// 事件监听
on(event, callback) {
if (!this.listeners[event]) {
this.listeners[event] = [];
}
this.listeners[event].push(callback);
}
// 移除事件监听
off(event, callback) {
if (this.listeners[event]) {
this.listeners[event] = this.listeners[event].filter(
listener => listener !== callback
);
}
}
// 触发事件
emit(event, data) {
if (this.listeners[event]) {
this.listeners[event].forEach(callback => callback(data));
}
}
// 判断是否为移动设备
isMobile() {
return this.currentBreakpoint === 'mobile';
}
// 判断是否为平板设备
isTablet() {
return this.currentBreakpoint === 'tablet';
}
// 判断是否为桌面设备
isDesktop() {
return ['desktop', 'wide'].includes(this.currentBreakpoint);
}
}
// 响应式图片管理器
class ResponsiveImageManager {
constructor() {
this.breakpoints = {
mobile: '(max-width: 767px)',
tablet: '(min-width: 768px) and (max-width: 1023px)',
desktop: '(min-width: 1024px)'
};
this.init();
}
// 初始化
init() {
this.setupImageLoading();
this.setupLazyLoading();
}
// 设置响应式图片加载
setupImageLoading() {
const responsiveImages = document.querySelectorAll('[data-responsive]');
responsiveImages.forEach(img => {
this.setupResponsiveImage(img);
});
}
// 设置单个响应式图片
setupResponsiveImage(img) {
const sources = JSON.parse(img.dataset.responsive);
let picture = img.parentElement;
// 如果不是picture元素，创建一个
if (picture.tagName !== 'PICTURE') {
picture = document.createElement('picture');
img.parentNode.insertBefore(picture, img);
picture.appendChild(img);
}
// 清空现有source元素
const existingSources = picture.querySelectorAll('source');
existingSources.forEach(source => source.remove());
// 添加新的source元素
Object.entries(sources).forEach(([breakpoint, src]) => {
const mediaQuery = this.breakpoints[breakpoint];
if (mediaQuery) {
const source = document.createElement('source');
source.media = mediaQuery;
source.srcset = src;
picture.appendChild(source);
}
});
}
// 设置懒加载
setupLazyLoading() {
const lazyImages = document.querySelectorAll('[loading="lazy"]');
if ('IntersectionObserver' in window) {
const imageObserver = new IntersectionObserver((entries, observer) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
const img = entry.target;
this.loadImage(img);
observer.unobserve(img);
}
});
});
lazyImages.forEach(img => imageObserver.observe(img));
} else {
// 降级处理
lazyImages.forEach(img => this.loadImage(img));
}
}
// 加载图片
loadImage(img) {
if (img.dataset.src) {
img.src = img.dataset.src;
img.removeAttribute('data-src');
}
}
// 根据屏幕尺寸选择图片
selectImageSize(sizes, screenWidth) {
const sortedSizes = Object.entries(sizes)
.sort(([a], [b]) => parseInt(b) - parseInt(a));
for (const [width, src] of sortedSizes) {
if (screenWidth >= parseInt(width)) {
return src;
}
}
return sortedSizes[sortedSizes.length - 1][1];
}
}
// 响应式导航菜单
class ResponsiveNavigation {
constructor(element) {
this.nav = element;
this.toggleButton = this.nav.querySelector('.nav-toggle');
this.menu = this.nav.querySelector('.nav-menu');
this.isOpen = false;
this.init();
}
init() {
// 设置事件监听器
this.setupEventListeners();
// 根据屏幕尺寸调整
this.adjustForScreenSize();
// 监听屏幕大小变化
this.setupResponsiveHandling();
}
setupEventListeners() {
if (this.toggleButton) {
this.toggleButton.addEventListener('click', () => {
this.toggle();
});
}
// 点击菜单外部关闭菜单
document.addEventListener('click', (e) => {
if (this.isOpen && !this.nav.contains(e.target)) {
this.close();
}
});
// ESC键关闭菜单
document.addEventListener('keydown', (e) => {
if (this.isOpen && e.key === 'Escape') {
this.close();
}
});
}
setupResponsiveHandling() {
const responsiveManager = new ResponsiveManager();
responsiveManager.on('breakpoint-change', ({ to }) => {
this.adjustForBreakpoint(to);
});
// 初始调整
this.adjustForBreakpoint(responsiveManager.currentBreakpoint);
}
adjustForBreakpoint(breakpoint) {
if (breakpoint === 'mobile') {
this.enableMobileMode();
} else {
this.enableDesktopMode();
}
}
enableMobileMode() {
this.menu.classList.add('mobile-menu');
this.menu.classList.remove('desktop-menu');
if (this.toggleButton) {
this.toggleButton.style.display = 'block';
}
// 确保菜单默认关闭
if (this.isOpen) {
this.close();
}
}
enableDesktopMode() {
this.menu.classList.add('desktop-menu');
this.menu.classList.remove('mobile-menu');
if (this.toggleButton) {
this.toggleButton.style.display = 'none';
}
// 确保菜单打开
if (!this.isOpen) {
this.open();
}
}
toggle() {
if (this.isOpen) {
this.close();
} else {
this.open();
}
}
open() {
this.isOpen = true;
this.menu.classList.add('open');
this.nav.classList.add('open');
// 设置ARIA属性
if (this.toggleButton) {
this.toggleButton.setAttribute('aria-expanded', 'true');
}
// 禁止背景滚动
document.body.style.overflow = 'hidden';
}
close() {
this.isOpen = false;
this.menu.classList.remove('open');
this.nav.classList.remove('open');
// 设置ARIA属性
if (this.toggleButton) {
this.toggleButton.setAttribute('aria-expanded', 'false');
}
// 恢复背景滚动
document.body.style.overflow = '';
}
adjustForScreenSize() {
const responsiveManager = new ResponsiveManager();
this.adjustForBreakpoint(responsiveManager.currentBreakpoint);
}
}
// 初始化响应式组件
document.addEventListener('DOMContentLoaded', () => {
// 初始化响应式管理器
const responsiveManager = new ResponsiveManager();
// 监听断点变化
responsiveManager.on('breakpoint-change', ({ from, to }) => {
console.log(`Breakpoint changed from ${from} to ${to}`);
// 可以在这里执行断点切换时的逻辑
document.body.setAttribute('data-breakpoint', to);
});
// 初始化响应式图片
const imageManager = new ResponsiveImageManager();
// 初始化响应式导航
const navElement = document.querySelector('.responsive-nav');
if (navElement) {
new ResponsiveNavigation(navElement);
}
});
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