vue实现滑动切换效果（仅在手机模式下可用）
时间：2021-04-01 08:16:21 | 栏目：vue | 点击：次
本文实例为大家分享了vue实现滑动时红黄色块左右滑动相应距离，效果如下图
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 class="back" @touchstart.prevent="touchStart" @touchmove.prevent="touchMove" @touchend="touchEnd" ref="back"> <div class="back-l" ref="left"></div> <div class="back-r" ref="right"></div> </div> </template> <style scoped lang="stylus" rel="stylesheet/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 class="back"
@touchstart.prevent="touchStart" @touchmove.prevent="touchMove"
@touchend="touchEnd" ref="back">
<div class="back-l" ref="left"></div>
<div class="back-r" 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" rel="stylesheet/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>