You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 

429 lines
15 KiB

class BgSwitcher {
constructor(images, options = {}) {
this.images = images
// 从localStorage中读取保存的索引
const savedIndex = localStorage.getItem("bgSwitcherIndex")
if (savedIndex !== null && !isNaN(savedIndex)) {
this.index = parseInt(savedIndex)
} else {
this.index = 0
}
this.container = options.container || document.body
this.interval = options.interval || 3000
this.effect = options.effect || BgSwitcher.fadeEffect
this.timer = null
this.apiTimer = null
this.apiUrl = null
this.apiInterval = 30000
this.startTime = 0
// 从localStorage中读取保存的剩余时间
const savedRemainingTime = localStorage.getItem("bgSwitcherRemainingTime")
this.remainingTime =
savedRemainingTime !== null && !isNaN(savedRemainingTime) && savedRemainingTime >= 0
? parseInt(savedRemainingTime)
: this.interval
this.bgLayer = document.createElement("div")
this.isInitialLoad = true
// 从localStorage中读取API模式状态
const isApiMode = localStorage.getItem("bgSwitcherIsApiMode") === "true"
if (isApiMode) {
this.apiUrl = localStorage.getItem("bgSwitcherApiUrl") || null
const savedApiInterval = localStorage.getItem("bgSwitcherApiInterval")
this.apiInterval = savedApiInterval !== null && !isNaN(savedApiInterval) ? parseInt(savedApiInterval) : 30000
}
// 监听页面可见性变化
this.handleVisibilityChange = this.handleVisibilityChange.bind(this)
document.addEventListener("visibilitychange", this.handleVisibilityChange)
// 监听页面卸载事件,确保保存状态
this.handleBeforeUnload = this.handleBeforeUnload.bind(this)
window.addEventListener("beforeunload", this.handleBeforeUnload)
this.bgLayer.style.position = "fixed"
this.bgLayer.style.top = 0
this.bgLayer.style.left = 0
this.bgLayer.style.width = "100vw"
this.bgLayer.style.height = "100vh"
this.bgLayer.style.zIndex = "-1"
this.bgLayer.style.transition = "opacity 1s"
this.bgLayer.style.opacity = 1
this.bgLayer.style.backgroundSize = "cover"
this.bgLayer.style.backgroundColor = "#000000"
this.bgLayer.style.backgroundPosition = "center"
this.bgLayer.style.filter = "brightness(0.68)"
this.container.style.backgroundColor = "#000000"
}
setBg(url) {
// 切换时先预加载目标图片,加载完成后再切换显示
const img = new Image()
img.onload = () => {
if (this.isInitialLoad) {
// 初始加载时,先设置背景图再添加到页面
this.bgLayer.style.backgroundImage = `url(${url})`
this.container.appendChild(this.bgLayer)
this.isInitialLoad = false
} else {
this.effect(this.bgLayer, url)
}
if (!this.isApiMode) {
this.scheduleNext()
}
}
img.onerror = () => {
// 加载失败时处理
console.warn("背景图片加载失败:", url)
if (this.isInitialLoad) {
// 初始加载失败时,也添加背景层到页面
this.container.appendChild(this.bgLayer)
this.isInitialLoad = false
}
}
img.src = url
}
next() {
const nextIndex = (this.index + 1) % this.images.length
const nextUrl = this.images[nextIndex]
// 切换前先预加载
const img = new Image()
img.onload = () => {
this.index = nextIndex
// 保存索引到localStorage
localStorage.setItem("bgSwitcherIndex", this.index)
this.effect(this.bgLayer, nextUrl)
this.scheduleNext()
}
img.onerror = () => {
// 加载失败时跳过
console.warn("背景图片加载失败:", nextUrl)
this.scheduleNext()
}
img.src = nextUrl
}
prev() {
const prevIndex = (this.index - 1 + this.images.length) % this.images.length
const prevUrl = this.images[prevIndex]
// 切换前先预加载
const img = new Image()
img.onload = () => {
this.index = prevIndex
// 保存索引到localStorage
localStorage.setItem("bgSwitcherIndex", this.index)
this.effect(this.bgLayer, prevUrl)
this.scheduleNext()
}
img.onerror = () => {
// 加载失败时跳过
console.warn("背景图片加载失败:", prevUrl)
this.scheduleNext()
}
img.src = prevUrl
}
start() {
if (this.timer || this.apiTimer) return
// 如果处于API模式,启动API请求
if (this.apiUrl) {
this.fetchRandomWallpaper()
} else {
// 否则使用默认轮播
this.setBg(this.images[this.index])
}
}
/**
* 安排下一次背景切换
*/
scheduleNext() {
if (this.timer) {
clearTimeout(this.timer)
}
// 记录开始时间
this.startTime = Date.now()
// 使用剩余时间或默认间隔
const timeToWait = this.remainingTime > 0 ? this.remainingTime : this.interval
this.timer = setTimeout(() => {
this.remainingTime = this.interval // 重置剩余时间
// 保存剩余时间到localStorage
localStorage.setItem("bgSwitcherRemainingTime", this.remainingTime)
this.next()
}, timeToWait)
}
/**
* 处理页面可见性变化
*/
handleVisibilityChange() {
if (document.hidden) {
// 页面不可见时,暂停计时器并计算剩余时间
if (this.timer) {
const elapsedTime = Date.now() - this.startTime
this.remainingTime = Math.max(0, this.remainingTime - elapsedTime)
// 保存剩余时间到localStorage
localStorage.setItem("bgSwitcherRemainingTime", this.remainingTime)
clearTimeout(this.timer)
this.timer = null
}
// 暂停API计时器
if (this.apiTimer) {
const elapsedTime = Date.now() - this.startTime
this.remainingTime = Math.max(0, this.remainingTime - elapsedTime)
// 保存剩余时间到localStorage
localStorage.setItem("bgSwitcherRemainingTime", this.remainingTime)
clearTimeout(this.apiTimer)
this.apiTimer = null
}
} else {
// 页面可见时,恢复计时器
if (!this.timer && !this.apiTimer && !this.apiUrl) {
// 如果没有活跃的计时器,使用默认的轮播
this.scheduleNext()
} else if (this.apiTimer === null && this.apiUrl) {
// 如果处于API模式但计时器未运行,恢复API请求
this.scheduleNextApiRequest()
}
}
}
/**
* 处理页面卸载事件,确保保存状态
*/
handleBeforeUnload() {
// 保存当前索引
localStorage.setItem("bgSwitcherIndex", this.index)
// 保存API模式状态
localStorage.setItem("bgSwitcherIsApiMode", !!this.apiUrl)
if (this.apiUrl) {
localStorage.setItem("bgSwitcherApiUrl", this.apiUrl)
localStorage.setItem("bgSwitcherApiInterval", this.apiInterval)
}
// 如果计时器在运行,计算并保存剩余时间
if (this.timer || this.apiTimer) {
const elapsedTime = Date.now() - this.startTime
this.remainingTime = Math.max(0, this.remainingTime - elapsedTime)
localStorage.setItem("bgSwitcherRemainingTime", this.remainingTime)
}
}
stop() {
if (this.timer) {
clearTimeout(this.timer)
this.timer = null
}
// 重置剩余时间
this.remainingTime = this.interval
// 保存剩余时间到localStorage
localStorage.setItem("bgSwitcherRemainingTime", this.remainingTime)
}
/**
* 从API获取随机壁纸并定期更新
* @param {string} apiUrl - 获取随机壁纸的API地址
* @param {number} interval - 请求间隔时间(毫秒)
*/
startRandomApiSwitch(apiUrl, interval = 30000) {
this.stop() // 停止当前的轮播
this.apiInterval = interval
this.apiUrl = apiUrl
// 创建专用的API计时器
this.apiTimer = null
// 立即请求一次
this.fetchRandomWallpaper()
}
/**
* 从API获取随机壁纸
*/
fetchRandomWallpaper() {
// 记录开始时间,用于计算剩余时间
this.startTime = Date.now()
this.remainingTime = this.apiInterval
fetch(this.apiUrl)
.then(response => {
console.log(response)
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`)
}
return response.json()
})
.then(data => {
// 假设API返回的数据格式为 { wallpaperUrl: '图片地址' }
const wallpaperUrl = data.wallpaperUrl || data.url || data.image
if (wallpaperUrl) {
// 预加载图片
const img = new Image()
img.onload = () => {
if (this.isInitialLoad) {
// 初始加载时,先设置背景图再添加到页面
this.container.appendChild(this.bgLayer)
this.isInitialLoad = false
}
// 保存当前索引(使用-1标记这是API获取的图片)
this.index = -1
localStorage.setItem("bgSwitcherIndex", -1)
this.effect(this.bgLayer, wallpaperUrl)
this.scheduleNextApiRequest()
}
img.onerror = () => {
console.warn("API返回的壁纸加载失败:", wallpaperUrl)
this.scheduleNextApiRequest()
}
img.src = wallpaperUrl
} else {
console.warn("背景图片加载失败:", url)
if (this.isInitialLoad) {
console.warn("API返回的数据格式不正确,未找到壁纸地址")
// 初始加载失败时,也添加背景层到页面
this.container.appendChild(this.bgLayer)
this.isInitialLoad = false
}
this.scheduleNextApiRequest()
}
})
.catch(error => {
console.error("获取随机壁纸失败:", error)
this.scheduleNextApiRequest()
})
}
/**
* 安排下一次API请求
*/
scheduleNextApiRequest() {
if (this.apiTimer) {
clearTimeout(this.apiTimer)
}
// 使用剩余时间或默认间隔
const timeToWait = this.remainingTime > 0 ? this.remainingTime : this.apiInterval
this.apiTimer = setTimeout(() => {
this.remainingTime = this.apiInterval // 重置剩余时间
localStorage.setItem("bgSwitcherRemainingTime", this.remainingTime)
this.fetchRandomWallpaper()
}, timeToWait)
}
/**
* 停止API随机壁纸请求
*/
stopRandomApiSwitch() {
if (this.apiTimer) {
clearTimeout(this.apiTimer)
this.apiTimer = null
}
this.apiUrl = null
// 重置剩余时间
this.remainingTime = this.interval
localStorage.setItem("bgSwitcherRemainingTime", this.remainingTime)
}
static fadeEffect(layer, url) {
layer.style.transition = "opacity 1s"
layer.style.opacity = 0
setTimeout(() => {
layer.style.backgroundImage = `url(${url})`
layer.style.opacity = 1
}, 500)
}
}
// 使用示例
// 1. 默认本地图片轮播
// const images = [
// '/static/bg2.webp',
// '/static/bg.jpg',
// ];
// const bgSwitcher = new BgSwitcher(images, { interval: 5000 });
// 启动轮播
// bgSwitcher.start();
// 2. 随机API壁纸示例
// 创建一个新的BgSwitcher实例用于API模式
let apiBgSwitcher = new BgSwitcher([], { interval: 5000 }) // API模式不需要本地图片列表
// 模拟API函数,实际使用时替换为真实API地址
function createMockWallpaperApi() {
// 模拟壁纸地址库
const mockWallpapers = ["/static/bg2.webp", "/static/bg.jpg"]
// 创建一个简单的服务器端点
if (window.mockWallpaperServer) {
clearInterval(window.mockWallpaperServer)
}
// 模拟API响应
window.fetchRandomWallpaper = function () {
return new Promise(resolve => {
setTimeout(() => {
const randomIndex = Math.floor(Math.random() * mockWallpapers.length)
resolve({
ok: true,
json() {
return {
wallpaperUrl: mockWallpapers[randomIndex],
}
},
})
}, 500)
})
}
// 替换原生fetch以模拟API调用
window.originalFetch = window.fetch
window.fetch = function (url) {
if (url === "/api/random-wallpaper") {
return window.fetchRandomWallpaper()
}
return window.originalFetch(url)
}
console.log("模拟壁纸API已启动")
}
// 初始化模拟API
createMockWallpaperApi()
// 启动API模式的随机壁纸切换(每10秒请求一次)
apiBgSwitcher.startRandomApiSwitch("/api/random-wallpaper", 10000)
window.addEventListener("pageshow", function (event) {
if (event.persisted) {
apiBgSwitcher = new BgSwitcher([], { interval: 5000 })
apiBgSwitcher.startRandomApiSwitch("/api/random-wallpaper", 10000)
}
})
// fetch("https://pic.xieyaxin.top/random.php")
// .then(response => {
// if(response.body instanceof ReadableStream) {
// return response.blob()
// }
// return response.json()
// })
// .then(data => {
// console.log(URL.createObjectURL(data));
// })
// 要停止API模式,使用
// apiBgSwitcher.stopRandomApiSwitch();
// 要切换回本地图片轮播,使用
// apiBgSwitcher.stopRandomApiSwitch();
// apiBgSwitcher.start();
// 启动默认轮播
// bgSwitcher.start();