$ npm install el-draggable
const box1 = document.getElementById('box-1')
new ElDraggable(box1, {
overflow: false,
containment: containment,
handler: 'span',
throttle: 30,
onStart () {
box1.style.zIndex = 999
},
onDrag (e, position) {
// TODO
},
onEnd () {
box1.style.zIndex = 'auto'
}
});