拖拽

鼠标mousedown/mousemove/mouseup事件

See the Pen drag-demo(mouse-event) by 风滚草 (@oliverlee-tumbleweed) on CodePen.

dragstart/dragover/dragend事件

See the Pen drag-demo(drag-event) by 风滚草 (@oliverlee-tumbleweed) on CodePen.