本文主要和大家分享实现JS拖动效果的简单方法，利用CSS3的Trnsform的移动属性来实现的，希望能帮助到大家。
代码如下
<!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>
#dom{
width: 50px;
height: 50px;
border: 2px solid red;
}
</style>
</head>
<body>
<p id="dom"></p>
<script>
(function(){
let dom = document.getElementById('dom');
let moveX,moveY
dom.addEventListener('mousedown',function (e) {
moveX=e.target.offsetWidth;
moveY=e.target.offsetHeight
console.log(e);
document.addEventListener('mousemove',move,false)
})
function move(e){
if(moveY&& moveY){
let width =moveX/2,height = width+moveY;
dom.style.transform='translate('+(e.x-width)+'px,'+(e.y-height)+'px)'
}
}
document.addEventListener('mousemove',move,false)
document.addEventListener('mouseup',function (e) {
let width =moveX/2,height = width+moveY;
let i =(e.x-width) +'px',y=(e.y-height)+'px';
if(moveX && moveY){
document.removeEventListener('mousemove',move,false);
dom.style.transform='translate('+i+','+y+')';
moveY='',moveX=''
}
})
})()
</script>
</body>
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