实现一个简单的拖拽

采用了 h5 的新特性

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

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.el {
flex-wrap: wrap;
}

.a,
.b {
width: 400px;
height: 400px;
border: 3px solid greenyellow;
margin-right: 80px;
margin-bottom: 50px;
line-height: 400px;
text-align: center;
font-size: 56px;
}

.flex {
display: flex;
}
</style>
</head>

<body>
<div class="el flex">
<div class="a" draggable='true'>1</div>
<div class="b" draggable='true'>2</div>
</div>
</body>
<script>
let $ = (el) => document.querySelector(el)
let $$ = (el) => document.querySelectorAll(el)
class Drag {
constructor(dom) {
this.dom = dom
this.fromDom = null
this.toFrom = null
}
init() {
let filterChild = [...this.dom.childNodes].filter(it => it.nodeName !== "#text" && !/\s/.test(it.nodeValue))
filterChild.map(it => {
it.setAttribute('draggable', 'true')
this.dragStart(it)
this.dragEnter(it)
this.drop(it)
})
}
dragStart(dom) {
let that = this
dom.ondragstart = function () {
that.fromDom = dom
}
}
dragEnter(dom) {
let that = this
dom.ondragover = function (e) {
that.toFrom = dom
e.preventDefault();
}
}
drop(dom) {
let that = this
dom.ondrop = function (e) {
let d = that.fromDom.innerHTML
that.fromDom.innerHTML = that.toFrom.innerHTML
that.toFrom.innerHTML = d
that.fromDom = null
that.toDom = null
}
}
}
let drap = new Drag($('.el'))
drap.init()
</script>

</html>