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