实现过程主要在于实时跟踪手指滑动位置与原位置之间的偏移量，再相应移动红黄块。
红黄块布局如下
back中包含back-l,back-r左右两块，正常情况下为了隐藏其中一块，子模块需要设置display: inline-block，并且宽度都需要设置width: 100%。父模块中设置white-space: nowrap用于处理两个子模块之间的空白。
<template lang="html"> <div @touchstart.prevent="touchStart" @touchmove.prevent="touchMove" @touchend="touchEnd" ref="back"> <div ref="left"></div> <div ref="right"></div> </div> </template> <style scoped lang="stylus"> .back position: fixed width: 100% height: 100px white-space: nowrap .back-l position: relative vertical-align: top display: inline-block width: 100% height: 100% background-color: red .back-r display: inline-block vertical-align: top position: relative width: 100% height: 100% background-color: yellow </style>
父模块监听滑动事件
滑动事件分为三种：touchstart，touchmove，touchEnd，加上prevent避免页面相应滑动。
在touchstart中记录滑动开始点：
touchStart(e) { const touch = e.touches[0] this.touch.startX = touch.pageX this.touch.startY = touch.pageY }
touchmove中为滑动过程，手指未离开页面，离开页面时触发touchend。滑动过程中，当横向偏离位置大于纵向偏离位置时认为滑动有效，记录手指偏离位置，相应移动红黄块。
touchMove(e) { console.log("move"); const touch = e.touches[0] //横向和纵向偏离位置 const deltaX = touch.pageX - this.touch.startX const deltaY = touch.pageY - this.touch.startY if (Math.abs(deltaY) > Math.abs(deltaX)) { return } const left = this.currentPlay == 'red' ? 0 : -window.innerWidth var offsetWidth = Math.min(0, Math.max(-window.innerWidth,left+deltaX)) //记录滑动的距离占屏幕宽度的百分比，如果滑动太少则不切换 this.percent = Math.abs(offsetWidth/window.innerWidth) //移动红黄块 this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)` //设置动画时间 this.$refs.back.style["transitionDuration"] = 10 }
计算偏移量时首先需要知道当前偏移位置，如果当前在红块，初始偏移量为0，否则初始偏移量为负的屏幕宽度。初始偏移量加上横向偏移量首先和-window.innerWidth取最大值，-window.innerWidth为最左偏移量。再和0相比较取最小值，偏移量为0或者大于零则不再（向右移动）移动，小于零则可以向左移动。
touchend中处理最终效果，如果滑动距离不大于某一值则恢复原位，否则切换。
touchEnd() { console.log("end"); console.log(this.percent); let offsetWidth let percent //当前为红色，滑动占比大于0.1则切换，否则回到原位置 if(this.currentPlay === 'red'){ if(this.percent > 0.1) { this.currentPlay = 'yellow' offsetWidth = -window.innerWidth } else { offsetWidth = 0 } } else { //当前为黄色，滑动占比大于0.9则切换，否则回到原位置 if(this.percent < 0.9) { this.currentPlay = 'red' offsetWidth = 0 } else { offsetWidth = -window.innerWidth } } //这里的transform是针对最开始的位置而言，而不是移动过程中的位置 this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)` this.$refs.back.style["transitionDuration"] = 10 }
完整代码
<template lang="html"> <div @touchstart.prevent="touchStart" @touchmove.prevent="touchMove" @touchend="touchEnd" ref="back"> <div ref="left"></div> <div ref="right"></div> </div> </template> <script> export default { data() { return { currentPlay: 'red', percent: 0 } }, created() { this.touch = {} }, methods: { touchStart(e) { const touch = e.touches[0] this.touch.startX = touch.pageX this.touch.startY = touch.pageY }, touchMove(e) { console.log("move"); const touch = e.touches[0] const deltaX = touch.pageX - this.touch.startX const deltaY = touch.pageY - this.touch.startY if (Math.abs(deltaY) > Math.abs(deltaX)) { return } const left = this.currentPlay == 'red' ? 0 : -window.innerWidth var offsetWidth = Math.min(0, Math.max(-window.innerWidth,left+deltaX)) this.percent = Math.abs(offsetWidth/window.innerWidth) this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)` this.$refs.back.style["transitionDuration"] = 10 }, touchEnd() { console.log("end"); console.log(this.percent); let offsetWidth let percent if(this.currentPlay === 'red'){ if(this.percent > 0.1) { this.currentPlay = 'yellow' offsetWidth = -window.innerWidth } else { offsetWidth = 0 } } else { if(this.percent < 0.9) { this.currentPlay = 'red' offsetWidth = 0 } else { offsetWidth = -window.innerWidth } } this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)` this.$refs.back.style["transitionDuration"] = 10 } } } </script> <style scoped lang="stylus"> .back position: fixed width: 100% height: 100px white-space: nowrap .back-l position: relative vertical-align: top display: inline-block width: 100% height: 100% background-color: red .back-r display: inline-block vertical-align: top position: relative width: 100% height: 100% background-color: yellow </style>