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index.html
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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>
#box {
height: 100px;
width: 100px;
background: red;
position: absolute;
}
</style>
</head>
<body>
<div id="box" draggable="true"></div>
<script>
var dragdiv = document.querySelector('#box');
var x, y; //记录到点击时鼠标到移动框左边和上边的距离
dragdiv.addEventListener('dragstart', function (e) {
e.dataTransfer.effectAllowed = "move"; //移动效果
e.dataTransfer.setData("text", ''); //附加数据， 没有这一项，firefox中无法移动
x = e.offsetX || e.layerX;
y = e.offsetY || e.layerY;
}, false);
document.addEventListener('dragover', function (e) {//取消冒泡 ,不取消则不能触发 drop事件
e.preventDefault()|| e.stopPropagation();
}, false);
document.addEventListener('drop', function (e) {
dragdiv.style.left = (e.pageX - x) + 'px';
dragdiv.style.top = (e.pageY - y) + 'px';
e.preventDefault() || e.stopPropagation(); //不取消，firefox中会触发网页跳转到查找setData中的内容
}, false);
</script>
</body>
</html>