<!DOCTYPE html>
<html>
<head>
<style>
.item img {
width:200px;
height:200px;
float: left;
}
.item{
float: left;
margin: 20px;
}
.drop-left,.drop-right {
width: 50px;
height: 200px;
float: left;
}
</style>
</head>
<body>
<div id="drag-wrap">
<div class="item" id="wrap1">
<img src="http://photos.tuchong.com/38538/f/6864556.jpg" id="img1" draggable="true">
</div>
<div class="item" id="wrap2">
<img src="http://photos.tuchong.com/349669/f/6695960.jpg" id="img2" draggable="true">
</div>
<div class="item" id="wrap3">
<img src="http://photos.tuchong.com/349669/f/6683901.jpg" id="img3" draggable="true">
</div>
<div class="item" id="wrap4">
<img src="http://photos.tuchong.com/349669/f/5121337.jpg" id="img4" draggable="true">
</div>
</div>
</body>
</html>
<script>
const dragCon = document.getElementById('drag-wrap');
dragCon.addEventListener('dragstart', startDrag, false);
/**
* 这里一定要阻止dragover的默认行为，不然触发不了drop
*/
dragCon.addEventListener('dragover', function (e) {
e.preventDefault();
}, false);
dragCon.addEventListener('drop', exchangeElement, false);
function startDrag(e) {
console.log(e)
e.dataTransfer.setData('Text', e.target.id + ';' + e.target.parentElement.id);
}
function exchangeElement(e) {
e.preventDefault();
const el = e.target;
let PE, //要插入位置的父元素
CE; //需要交换的元素
if (el.tagName.toLowerCase() !== 'div') {
PE = el.parentElement;
CE = el;
} else {
PE = el;
CE = el.querySelector('img');
}
/**
* 判断不在控制范围内
*/
if (!PE.classList.contains('item')) {
return;
}
const data = e.dataTransfer.getData('Text').split(';');
//交换元素
document.getElementById(data[1]).appendChild(CE);
PE.appendChild(document.getElementById(data[0]));
}
</script>
js实现图片拖动改变顺序