function?fnDown(event)?{ event=event||window.event; var?loginPanel=document.getElementById('loginPanel'); disX?=event.clientX-loginPanel.offsetLeft; disY?=?event.clientY-loginPanel.offsetTop; document.onmousemove=function(event){ event=event||window.event; var?changedisX=event.clientX-disX, changedisY=event.clientY-disY, winW=document.documentElement.clientWidth||document.body.clientWidth, winH=document.documentElement.clientHeight||document.body.clientHeight, maxW=winW-loginPanel.offsetWidth,//?loginPanel?不可以從fnDown()取得值嗎? maxH=winH-loginPanel.offsetHeight; if?(changedisX<0)?{ changedisX=0; }else?if?(changedisX>maxW)?{ changedisX=maxW; } loginPanel.style.left=changedisX+"px"; loginPanel.style.top=changedisY+"px"; } document.onmouseup=function(){ document.onmousemove=null; document.onmoseup=null; } //?body... }