JS實現左滑出現刪除按鈕


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>js側滑顯示刪除按鈕</title>
<style>
*{margin:0;padding:0;}
body{font-size:.14rem;}
li{list-style:none;}
i{font-style:normal;}
a{color:#393939;text-decoration:none;}
.list{overflow:hidden;margin-top:.2rem;padding-left:.3rem;border-top:1px solid #ddd;}
.list li{overflow:hidden;width:120%;border-bottom:1px solid #ddd;}
.list li a{display:block;height:.88rem;line-height:.88rem;-webkit-transition:all 0.3s linear;transition:all 0.3s linear;}
.list li i{float:right;width:15%;text-align:center;background:#E2421B;color:#fff;}
.swipeleft{transform:translateX(-15%);-webkit-transform:translateX(-15%);}
</style>
<script>
//計算根節點HTML的字體大小
function resizeRoot(){
 var deviceWidth = document.documentElement.clientWidth,
  num = 750,
  num1 = num / 100;
 if(deviceWidth > num){
  deviceWidth = num;
 }
 document.documentElement.style.fontSize = deviceWidth / num1 + "px";
}
//根節點HTML的字體大小初始化
resizeRoot();
 
window.onresize = function(){
 resizeRoot();
};
</script>
</head>
<body>
<section>
<div class="list">
 <ul>
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >側滑顯示刪除按鈕1<i>刪除</i></a></li>
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >側滑顯示刪除按鈕2<i>刪除</i></a></li>
  <li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >側滑顯示刪除按鈕3<i>刪除</i></a></li>
 </ul>
</div>
<script>
//側滑顯示刪除按鈕
var expansion = null; //是否存在展開的list
var container = document.querySelectorAll('.list li a');
for(var i = 0; i < container.length; i++){
 var x, y, X, Y, swipeX, swipeY;
 container[i].addEventListener('touchstart', function(event) {
  x = event.changedTouches[0].pageX;
  y = event.changedTouches[0].pageY;
  swipeX = true;
  swipeY = true ;
  if(expansion){ //判斷是否展開,如果展開則收起
   expansion.className = "";
  
 });
 container[i].addEventListener('touchmove', function(event){
   
  X = event.changedTouches[0].pageX;
  Y = event.changedTouches[0].pageY; 
  // 左右滑動
  if(swipeX && Math.abs(X - x) - Math.abs(Y - y) > 0){
   // 阻止事件冒泡
   event.stopPropagation();
   if(X - x > 10){ //右滑
    event.preventDefault();
    this.className = ""; //右滑收起
   }
   if(x - X > 10){ //左滑
    event.preventDefault();
    this.className = "swipeleft"; //左滑展開
    expansion = this;
   }
   swipeY = false;
  }
  // 上下滑動
  if(swipeY && Math.abs(X - x) - Math.abs(Y - y) < 0) {
   swipeX = false;
  
 });
}
</script>
</body>
</html>


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