<template>
 <div class="slider-item">
 <div
 class="content"
 @touchstart='touchStart'
 @touchmove='touchMove'
 @touchend='touchEnd'
 :style="deleteSlider"
 >
 <div class="remove">刪除</div>
 </div>
 </div>
</template>
<script>
// 獲取刪除按鈕的寬度，此寬度為滑塊左滑的最大距離
const DELBTNWIDTH = 60;
export default {
 data() {
 return {
 startX: 0, // 開始pos
 endX: 0, // 結束pos
 moveX: 0, // 滑動時的pos
 disX: 0, // 滑動距離
 deleteSlider: 'transform:translateX(0px)',
 };
 },
 methods: {
 touchStart(timestamp, ev) {
 ev = ev || event;
 this.currSliderTimestamp = timestamp;
 this.startX = 0;
 // tounches類數組，等于1時表示此時有只有一只手指在觸摸屏幕
 if (ev.touches.length === 1) {
 // 記錄開始位置
 this.startX = ev.touches[0].clientX;
 console.log(this.startX, this.disX);
 }
 },
 touchMove(timestamp, ev) {
 ev = ev || event;
 if (ev.touches.length === 1) {
 // 滑動時距離瀏覽器左側實時距離
 this.moveX = ev.touches[0].clientX;
 //實時滑動距離，和上一次滑動做個銜接。防止第二次觸發的時候，位置不對的問題
 this.disX = this.startX - this.moveX + this.disX;
 // 如果是向右滑動或者不滑動，不改變滑塊的位置
 if (this.disX > 0) {
 if (this.disX < 100) {
 this.deleteSlider = 'transform:translateX(-' + this.disX + 'px)';
 } else {
 this.deleteSlider = 'transform:translateX(-100px)';
 }
 } else {
 if (this.disX < -60) {
 this.deleteSlider = 'transform:translateX(60px)';
 } else {
 this.deleteSlider = 'transform:translateX(' + Math.abs(this.disX) + 'px)';
 }
 }
 }
 },
 touchEnd() {
 //滑動完成后，滑塊應該在的位置
 if (this.disX < 100) {
 this.deleteSlider = 'transform:translateX(0px)';
 this.disX = 0;
 } else {
 this.deleteSlider = 'transform:translateX(-' + DELBTNWIDTH + 'px)';
 this.disX = 60;
 }
 },
 },
};
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
.slider-item {
 width: 100%;
 height: 60px;
 border-bottom: 1px solid #eeeeee;
 overflow: hidden;
 display: flex;
 position: relative;

 .content {
 min-width: 100%;
 height: 100%;
 background: yellow;
 box-sizing: normal-box;
 padding-right: 60px;
 position: relative;
 transition-property: all;
 transition-duration: 0.4s;
 transition-timing-function: cubic-bezier(0, 0.85, 0.72, 0.86);
 transition-delay: 0s;

 .remove {
 position: absolute;
 top: 0;
 right: 0;
 width: 60px;
 height: 60px;
 background: #fe5ba8;
 text-align: center;
 line-height: 60px;
 font-size: 15px;
 color: #ffffff;
 }
 }
}
</style>