html 5拖放在移动屏幕上不起作用

Question

我正在创建一个场景，其中我想要一个拖放组件，

经过一番解决后我发现了一个，如下所示

function allowDrop(ev) {
    ev.preventDefault();
}

function drag(ev) {
    ev.dataTransfer.setData("text", ev.target.id);
}

function drop(ev) {
    ev.preventDefault();
    let target = ev.target;
    let btnsHolder = document.getElementById("buttonsHolder")
    let currentBtn;
    var data = ev.dataTransfer.getData("text");

    //check if there's already a button inside
    if (target.children.length > 0){
      currentBtn = target.children[0];
      btnsHolder.appendChild(currentBtn);
    }

    target.appendChild(document.getElementById(data));    
}
#div1 {
    width: 350px;
    height: 70px;
    padding: 10px;
    border: 1px solid #aaaaaa;
}
<p>Drag the W3Schools image into the rectangle:</p>
<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<br>
<div id="buttonsHolder">
  <button id="test" draggable="true" ondragstart="drag(event)" width="336" height="69">button 1</button>
  <button id="test2" draggable="true" ondragstart="drag(event)" width="336" height="69">button 2</button>
  <button id="test3" draggable="true" ondragstart="drag(event)" width="336" height="69">button 3</button>
</div>

但相同代码的问题是，

电脑端可以用，手机端不行

供测试用，

按下后

F12

单击切换设备工具栏将启用移动视图，

并且相同的代码不起作用，

这里可能存在什么问题？

Answer 1

某些移动设备不侦听该drag事件。要解决这个问题，您必须使用触摸事件touchstart, touchend, touchcancel, touchleave, touchmove TouchEvent - Web API

// get The element on which to attach the event 
var btn = document.querySelector('.btn');

// attaching each event listener
btn.addEventListener('touchstart', function(){
	console.log('btn touched');
})
btn.addEventListener('touchend', function(){
	console.log('btn leaved');
})
btn.addEventListener('touchmove', function(){
	console.log('btn leaved');
})
btn.addEventListener('touchleave', function(){
	console.log('btn moving end');
})
btn.addEventListener('touchcancel', function(){
	console.log('btn moving cancel');
})

<button class="btn">test</button>