效果圖如下所示：
前言
嗨，說起探探想必各位程序汪都不陌生(畢竟妹子很多)，能在上面絲滑的翻牌子，探探的的堆疊滑動組件起到了關鍵的作用，下面就來看看如何用vue寫一個探探的堆疊組件
一. 功能分析
簡單使用下探探會發現，堆疊滑動的功能很簡單，用一張圖概括就是:
簡單歸納下里面包含的基本功能點:
二. 具體實現
有了歸納好的功能點，我們實現組件的思路會更清晰
1. 堆疊效果
堆疊圖片效果在網上有大量的實例，實現的方法大同小異，主要通過在父層設定perspective 及perspective-origin ，來實現子層的透視，子層設定好translate3d Z軸數值即可模擬出堆疊效果，具體代碼如下
// 圖片堆疊dom <!--opacity: 0 隱藏我們不想看到的stack-item層級--> <!--z-index: -1 調整stack-item層級"--><ul class="stack"> <li class="stack-item" style="transform: translate3d(0px, 0px, 0px);opacity: 1;z-index: 10;"><img src="1.png" alt="01"></li> <li class="stack-item" style="transform: translate3d(0px, 0px, -60px);opacity: 1;z-index: 1"><img src="2.png" alt="02"></li> <li class="stack-item" style="transform: translate3d(0px, 0px, -120px);opacity: 1;z-index: 1"><img src="3.png" alt="03"></li> <li class="stack-item" style="transform: translate3d(0px, 0px, -180px);opacity: 0;z-index: -1"><img src="4.png" alt="04"></li> <li class="stack-item" style="transform: translate3d(0px, 0px, -180px);opacity: 0;z-index: -1"><img src="5.png" alt="05"></li></ul><style>.stack { width: 100%; height: 100%; position: relative; perspective: 1000px; //子元素視距 perspective-origin: 50% 150%; //子元素透視位置 -webkit-perspective: 1000px; -webkit-perspective-origin: 50% 150%; margin: 0; padding: 0; } .stack-item{ background: #fff; height: 100%; width: 100%; border-radius: 4px; text-align: center; overflow: hidden; } .stack-item img { width: 100%; display: block; pointer-events: none; }</style>上面只是一組靜態代碼，我們希望得到的是vue組件，所以需要先建立一個組件模板stack.vue，在模板中我們可以使用v-for，遍歷出stack節點，使用:style 來修改各個item的style，代碼如下
<template> <ul class="stack"> <li class="stack-item" v-for="(item, index) in pages" :style="[transform(index)]"> <img :src="item.src"> </li> </ul></template><script>export default { props: { // pages數據包含基礎的圖片數據 pages: { type: Array, default: [] } }, data () { return { // basicdata數據包含組件基本數據 basicdata: { currentPage: 0 // 默認首圖的序列 }, // temporaryData數據包含組件臨時數據 temporaryData: { opacity: 1, // 記錄opacity zIndex: 10, // 記錄zIndex visible: 3 // 記錄默認顯示堆疊數visible } } }, methods: { // 遍歷樣式 transform (index) { if (index >= this.basicdata.currentPage) { let style = {} let visible = this.temporaryData.visible let perIndex = index - this.basicdata.currentPage // visible可見數量前滑塊的樣式 if (index <= this.basicdata.currentPage + visible - 1) { style['opacity'] = '1' style['transform'] = 'translate3D(0,0,' + -1 * perIndex * 60 + 'px' + ')' style['zIndex'] = visible - index + this.basicdata.currentPage style['transitionTimingFunction'] = 'ease' style['transitionDuration'] = 300 + 'ms' } else { style['zIndex'] = '-1' style['transform'] = 'translate3D(0,0,' + -1 * visible * 60 + 'px' + ')' } return style } } }}</script>關鍵點
:style 可以綁定對象的同時，也可以綁定數組和函數，這在遍歷的時候很有用
最基本的dom結構已經構建完畢，下一步是讓首張圖片“動”起來
2. 圖片滑動
圖片滑動效果，在很多場景中都有出現，其原理無非是監聽touchs事件，得到位移，再通過translate3D改變目標位移，因此我們要實現的步驟如下
#### 具體實現
在vue框架中，不建議直接操作節點，而是通過指令v-on對元素進行綁定，因此我們將綁定都寫在v-for遍歷里，通過index進行判斷其是否是首圖，再使用:style修改首頁的樣式，具體代碼如下:
<template> <ul class="stack"> <li class="stack-item" v-for="(item, index) in pages" :style="[transformIndex(index),transform(index)]" @touchstart.stop.capture="touchstart" @touchmove.stop.capture="touchmove" @touchend.stop.capture="touchend" @mousedown.stop.capture="touchstart" @mouseup.stop.capture="touchend" @mousemove.stop.capture="touchmove"> <img :src="item.src"> </li> </ul></template><script>export default { props: { // pages數據包含基礎的圖片數據 pages: { type: Array, default: [] } }, data () { return { // basicdata數據包含組件基本數據 basicdata: { start: {}, // 記錄起始位置 end: {}, // 記錄終點位置 currentPage: 0 // 默認首圖的序列 }, // temporaryData數據包含組件臨時數據 temporaryData: { poswidth: '', // 記錄位移 posheight: '', // 記錄位移 tracking: false // 是否在滑動，防止多次操作，影響體驗 } } }, methods: { touchstart (e) { if (this.temporaryData.tracking) { return } // 是否為touch if (e.type === 'touchstart') { if (e.touches.length > 1) { this.temporaryData.tracking = false return } else { // 記錄起始位置 this.basicdata.start.t = new Date().getTime() this.basicdata.start.x = e.targetTouches[0].clientX this.basicdata.start.y = e.targetTouches[0].clientY this.basicdata.end.x = e.targetTouches[0].clientX this.basicdata.end.y = e.targetTouches[0].clientY } // pc操作 } else { this.basicdata.start.t = new Date().getTime() this.basicdata.start.x = e.clientX this.basicdata.start.y = e.clientY this.basicdata.end.x = e.clientX this.basicdata.end.y = e.clientY } this.temporaryData.tracking = true }, touchmove (e) { // 記錄滑動位置 if (this.temporaryData.tracking && !this.temporaryData.animation) { if (e.type === 'touchmove') { this.basicdata.end.x = e.targetTouches[0].clientX this.basicdata.end.y = e.targetTouches[0].clientY } else { this.basicdata.end.x = e.clientX this.basicdata.end.y = e.clientY } // 計算滑動值 this.temporaryData.poswidth = this.basicdata.end.x - this.basicdata.start.x this.temporaryData.posheight = this.basicdata.end.y - this.basicdata.start.y } }, touchend (e) { this.temporaryData.tracking = false // 滑動結束，觸發判斷 }, // 非首頁樣式切換 transform (index) { if (index > this.basicdata.currentPage) { let style = {} let visible = 3 let perIndex = index - this.basicdata.currentPage // visible可見數量前滑塊的樣式 if (index <= this.basicdata.currentPage + visible - 1) { style['opacity'] = '1' style['transform'] = 'translate3D(0,0,' + -1 * perIndex * 60 + 'px' + ')' style['zIndex'] = visible - index + this.basicdata.currentPage style['transitionTimingFunction'] = 'ease' style['transitionDuration'] = 300 + 'ms' } else { style['zIndex'] = '-1' style['transform'] = 'translate3D(0,0,' + -1 * visible * 60 + 'px' + ')' } return style } }, // 首頁樣式切換 transformIndex (index) { // 處理3D效果 if (index === this.basicdata.currentPage) { let style = {} style['transform'] = 'translate3D(' + this.temporaryData.poswidth + 'px' + ',' + this.temporaryData.posheight + 'px' + ',0px)' style['opacity'] = 1 style['zIndex'] = 10 return style } } }}</script>3. 條件成功后的滑出，條件失敗后的回彈
條件的觸發判斷是在touchend/mouseup后進行，在這里我們先用簡單的條件進行判定，同時給予首圖彈出及回彈的效果，代碼如下
<template> <ul class="stack"> <li class="stack-item" v-for="(item, index) in pages" :style="[transformIndex(index),transform(index)]" @touchmove.stop.capture="touchmove" @touchstart.stop.capture="touchstart" @touchend.stop.capture="touchend" @mousedown.stop.capture="touchstart" @mouseup.stop.capture="touchend" @mousemove.stop.capture="touchmove"> <img :src="item.src"> </li> </ul></template><script>export default { props: { // pages數據包含基礎的圖片數據 pages: { type: Array, default: [] } }, data () { return { // basicdata數據包含組件基本數據 basicdata: { start: {}, // 記錄起始位置 end: {}, // 記錄終點位置 currentPage: 0 // 默認首圖的序列 }, // temporaryData數據包含組件臨時數據 temporaryData: { poswidth: '', // 記錄位移 posheight: '', // 記錄位移 tracking: false, // 是否在滑動，防止多次操作，影響體驗 animation: false, // 首圖是否啟用動畫效果，默認為否 opacity: 1 // 記錄首圖透明度 } } }, methods: { touchstart (e) { if (this.temporaryData.tracking) { return } // 是否為touch if (e.type === 'touchstart') { if (e.touches.length > 1) { this.temporaryData.tracking = false return } else { // 記錄起始位置 this.basicdata.start.t = new Date().getTime() this.basicdata.start.x = e.targetTouches[0].clientX this.basicdata.start.y = e.targetTouches[0].clientY this.basicdata.end.x = e.targetTouches[0].clientX this.basicdata.end.y = e.targetTouches[0].clientY } // pc操作 } else { this.basicdata.start.t = new Date().getTime() this.basicdata.start.x = e.clientX this.basicdata.start.y = e.clientY this.basicdata.end.x = e.clientX this.basicdata.end.y = e.clientY } this.temporaryData.tracking = true this.temporaryData.animation = false }, touchmove (e) { // 記錄滑動位置 if (this.temporaryData.tracking && !this.temporaryData.animation) { if (e.type === 'touchmove') { this.basicdata.end.x = e.targetTouches[0].clientX this.basicdata.end.y = e.targetTouches[0].clientY } else { this.basicdata.end.x = e.clientX this.basicdata.end.y = e.clientY } // 計算滑動值 this.temporaryData.poswidth = this.basicdata.end.x - this.basicdata.start.x this.temporaryData.posheight = this.basicdata.end.y - this.basicdata.start.y } }, touchend (e) { this.temporaryData.tracking = false this.temporaryData.animation = true // 滑動結束，觸發判斷 // 簡單判斷滑動寬度超出100像素時觸發滑出 if (Math.abs(this.temporaryData.poswidth) >= 100) { // 最終位移簡單設定為x軸200像素的偏移 let ratio = Math.abs(this.temporaryData.posheight / this.temporaryData.poswidth) this.temporaryData.poswidth = this.temporaryData.poswidth >= 0 ? this.temporaryData.poswidth + 200 : this.temporaryData.poswidth - 200 this.temporaryData.posheight = this.temporaryData.posheight >= 0 ? Math.abs(this.temporaryData.poswidth * ratio) : -Math.abs(this.temporaryData.poswidth * ratio) this.temporaryData.opacity = 0 // 不滿足條件則滑入 } else { this.temporaryData.poswidth = 0 this.temporaryData.posheight = 0 } }, // 非首頁樣式切換 transform (index) { if (index > this.basicdata.currentPage) { let style = {} let visible = 3 let perIndex = index - this.basicdata.currentPage // visible可見數量前滑塊的樣式 if (index <= this.basicdata.currentPage + visible - 1) { style['opacity'] = '1' style['transform'] = 'translate3D(0,0,' + -1 * perIndex * 60 + 'px' + ')' style['zIndex'] = visible - index + this.basicdata.currentPage style['transitionTimingFunction'] = 'ease' style['transitionDuration'] = 300 + 'ms' } else { style['zIndex'] = '-1' style['transform'] = 'translate3D(0,0,' + -1 * visible * 60 + 'px' + ')' } return style } }, // 首頁樣式切換 transformIndex (index) { // 處理3D效果 if (index === this.basicdata.currentPage) { let style = {} style['transform'] = 'translate3D(' + this.temporaryData.poswidth + 'px' + ',' + this.temporaryData.posheight + 'px' + ',0px)' style['opacity'] = this.temporaryData.opacity style['zIndex'] = 10 if (this.temporaryData.animation) { style['transitionTimingFunction'] = 'ease' style['transitionDuration'] = 300 + 'ms' } return style } } }}</script>4. 滑出后下一張圖片堆疊到頂部
重新堆疊是組件最后一個功能，同時也是最重要和復雜的功能。在我們的代碼里，stack-item的排序依賴綁定:style的transformIndex和transform函數，函數里判定的條件是currentPage，那是不是改變currentPage，讓其+1，即可完成重新堆疊呢？
答案沒有那么簡單，因為我們滑出是動畫效果，會進行300ms的時間，而currentPage變化引起的重排，會立即變化，打斷動畫的進行。因此我們需要先修改transform函數的排序條件，后改變currentPage。
#### 具體實現
代碼如下：
<template> <ul class="stack"> <li class="stack-item" v-for="(item, index) in pages" :style="[transformIndex(index),transform(index)]" @touchmove.stop.capture="touchmove" @touchstart.stop.capture="touchstart" @touchend.stop.capture="touchend" @mousedown.stop.capture="touchstart" @mouseup.stop.capture="touchend" @mousemove.stop.capture="touchmove" @webkit-transition-end="onTransitionEnd" @transitionend="onTransitionEnd" > <img :src="item.src"> </li> </ul></template><script>export default { props: { // pages數據包含基礎的圖片數據 pages: { type: Array, default: [] } }, data () { return { // basicdata數據包含組件基本數據 basicdata: { start: {}, // 記錄起始位置 end: {}, // 記錄終點位置 currentPage: 0 // 默認首圖的序列 }, // temporaryData數據包含組件臨時數據 temporaryData: { poswidth: '', // 記錄位移 posheight: '', // 記錄位移 lastPosWidth: '', // 記錄上次最終位移 lastPosHeight: '', // 記錄上次最終位移 tracking: false, // 是否在滑動，防止多次操作，影響體驗 animation: false, // 首圖是否啟用動畫效果，默認為否 opacity: 1, // 記錄首圖透明度 swipe: false // onTransition判定條件 } } }, methods: { touchstart (e) { if (this.temporaryData.tracking) { return } // 是否為touch if (e.type === 'touchstart') { if (e.touches.length > 1) { this.temporaryData.tracking = false return } else { // 記錄起始位置 this.basicdata.start.t = new Date().getTime() this.basicdata.start.x = e.targetTouches[0].clientX this.basicdata.start.y = e.targetTouches[0].clientY this.basicdata.end.x = e.targetTouches[0].clientX this.basicdata.end.y = e.targetTouches[0].clientY } // pc操作 } else { this.basicdata.start.t = new Date().getTime() this.basicdata.start.x = e.clientX this.basicdata.start.y = e.clientY this.basicdata.end.x = e.clientX this.basicdata.end.y = e.clientY } this.temporaryData.tracking = true this.temporaryData.animation = false }, touchmove (e) { // 記錄滑動位置 if (this.temporaryData.tracking && !this.temporaryData.animation) { if (e.type === 'touchmove') { this.basicdata.end.x = e.targetTouches[0].clientX this.basicdata.end.y = e.targetTouches[0].clientY } else { this.basicdata.end.x = e.clientX this.basicdata.end.y = e.clientY } // 計算滑動值 this.temporaryData.poswidth = this.basicdata.end.x - this.basicdata.start.x this.temporaryData.posheight = this.basicdata.end.y - this.basicdata.start.y } }, touchend (e) { this.temporaryData.tracking = false this.temporaryData.animation = true // 滑動結束，觸發判斷 // 簡單判斷滑動寬度超出100像素時觸發滑出 if (Math.abs(this.temporaryData.poswidth) >= 100) { // 最終位移簡單設定為x軸200像素的偏移 let ratio = Math.abs(this.temporaryData.posheight / this.temporaryData.poswidth) this.temporaryData.poswidth = this.temporaryData.poswidth >= 0 ? this.temporaryData.poswidth + 200 : this.temporaryData.poswidth - 200 this.temporaryData.posheight = this.temporaryData.posheight >= 0 ? Math.abs(this.temporaryData.poswidth * ratio) : -Math.abs(this.temporaryData.poswidth * ratio) this.temporaryData.opacity = 0 this.temporaryData.swipe = true // 記錄最終滑動距離 this.temporaryData.lastPosWidth = this.temporaryData.poswidth this.temporaryData.lastPosHeight = this.temporaryData.posheight // currentPage+1 引發排序變化 this.basicdata.currentPage += 1 // currentPage切換，整體dom進行變化，把第一層滑動置零 this.$nextTick(() => { this.temporaryData.poswidth = 0 this.temporaryData.posheight = 0 this.temporaryData.opacity = 1 }) // 不滿足條件則滑入 } else { this.temporaryData.poswidth = 0 this.temporaryData.posheight = 0 this.temporaryData.swipe = false } }, onTransitionEnd (index) { // dom發生變化后，正在執行的動畫滑動序列已經變為上一層 if (this.temporaryData.swipe && index === this.basicdata.currentPage - 1) { this.temporaryData.animation = true this.temporaryData.lastPosWidth = 0 this.temporaryData.lastPosHeight = 0 this.temporaryData.swipe = false } }, // 非首頁樣式切換 transform (index) { if (index > this.basicdata.currentPage) { let style = {} let visible = 3 let perIndex = index - this.basicdata.currentPage // visible可見數量前滑塊的樣式 if (index <= this.basicdata.currentPage + visible - 1) { style['opacity'] = '1' style['transform'] = 'translate3D(0,0,' + -1 * perIndex * 60 + 'px' + ')' style['zIndex'] = visible - index + this.basicdata.currentPage style['transitionTimingFunction'] = 'ease' style['transitionDuration'] = 300 + 'ms' } else { style['zIndex'] = '-1' style['transform'] = 'translate3D(0,0,' + -1 * visible * 60 + 'px' + ')' } return style // 已滑動模塊釋放后 } else if (index === this.basicdata.currentPage - 1) { let style = {} // 繼續執行動畫 style['transform'] = 'translate3D(' + this.temporaryData.lastPosWidth + 'px' + ',' + this.temporaryData.lastPosHeight + 'px' + ',0px)' style['opacity'] = '0' style['zIndex'] = '-1' style['transitionTimingFunction'] = 'ease' style['transitionDuration'] = 300 + 'ms' return style } }, // 首頁樣式切換 transformIndex (index) { // 處理3D效果 if (index === this.basicdata.currentPage) { let style = {} style['transform'] = 'translate3D(' + this.temporaryData.poswidth + 'px' + ',' + this.temporaryData.posheight + 'px' + ',0px)' style['opacity'] = this.temporaryData.opacity style['zIndex'] = 10 if (this.temporaryData.animation) { style['transitionTimingFunction'] = 'ease' style['transitionDuration'] = 300 + 'ms' } return style } } }}</script>ok~ 完成了上面的四步，堆疊組件的基本功能就已經實現，快來看看效果吧
堆疊滑動效果已經出來了，但是探探在體驗上，還增加了觸碰角度偏移，以及判定滑出面積比例
角度偏移的原理，是在用戶每次進行touch時，記錄用戶觸碰位置，計算出最大的偏移角度，在滑動出現位移時，線性增加角度以至最大的偏移角度。
使用在stack中具體要做的是：
判定滑出面積比例，主要通過偏移量計算出偏移面積，從而得到面積比例，完成判斷
完整的代碼和demo可以在 github 上查看源碼，這里就不貼出來了
謝謝大家看完這篇文章，喜歡可以在github上給個:star:️ ，最后祝大家在探探上都能找到前女友:green_heart:
總結
以上所述是小編給大家介紹的使用vue制作探探滑動組件的實例代碼，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對武林網網站的支持！
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