原生JS实现列表右滑删除与收藏功能详解

<!DOCTYPE html>
<html lang="en">

<head>
 <meta charset="UTF-8">
 <meta name="viewport"
  content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
 <title>支付宝前端机试题</title>
 <link rel="stylesheet" href="css/index.css" rel="external nofollow" >
 <script src="js/index.js"></script>
</head>

<body>
 <h2 class="title">购物车</h2>
 <section class="shoppingList"></section>
</body>

</html>

let initXY = [0,0];//记录移动的坐标
let isStop = false;//记录是否禁止滑动
let oldIndex = null;//记录旧的下标
let theIndex = null;//记录新的下标

function touchstart(event,index){
 if(event.touches.length > 1) {
  isStop = true;
  return;
 }
 oldIndex = theIndex;
 theIndex = null;
 initXY = [event.touches[0].pageX,event.touches[0].pageY];
 // console.log(initXY);
}

function touchmove(event,index){
 if(event.touches.length > 1) return;
 let moveX = event.touches[0].pageX - initXY[0];
 let moveY = event.touches[0].pageY - initXY[1];
 if(isStop || Math.abs(moveX) < 5) return;//如果禁止滑动或者滑动的距离小于5就返回
 if(Math.abs(moveY) > Math.abs(moveX)){
  isStop = true;
  return;
 }
 if(moveX<0){
  theIndex = index;
  isStop = true;
 }else if(theIndex && oldIndex === theIndex){
  oldIndex =index;
  theIndex = null;
  isStop = true;
  setTimeout(()=>{oldIndex=null;},150);//设置150毫秒延迟来凸显动画效果，实际不加也可以
 }
 // 这里用jq就不用循环了，但我懒得引，大家知道就好
 let goods = document.getElementsByClassName("goodsInfo");
 for(let i=0;i<goods.length;i++){
  theIndex === i ? goods[i].classList.add("open") : goods[i].classList.remove("open");
 };
 // console.log(moveX,moveY);
}

function touchend(){
 isStop = false;
}