JavaScript special effects for dragging small squares_image special effects

<div style="width:140px; height:140px; background-color:pink; cursor:pointer;" id="divBlock" onmousedown="divBlock_event_mousedown(arguments[0]);"></div>
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> function divBlock_event_mousedown(e){ var e, obj, temp; obj=document.getElementById("divBlock"); e=window.event?window.event:e; obj.startX=e.clientX-obj.offsetLeft; obj.startY=e.clientY-obj.offsetTop; document.onmousemove=document_event_mousemove; temp=document.attachEvent?document.attachEvent("onmouseup",document_event_mouseup):document.addEventListener("mouseup",document_event_mouseup,""); } function document_event_mousemove(e){ var e, obj; obj=document.getElementById("divBlock"); e=window.event?window.event:e; with(obj.style){ position="absolute"; left=e.clientX-obj.startX+"px"; top=e.clientY-obj.startY+"px"; } } function document_event_mouseup(e){ var temp; document.onmousemove=""; temp=document.detachEvent?document.detachEvent("onmouseup",document_event_mouseup):document.removeEventListener("mouseup",document_event_mouseup,""); } </script>