?????//?添加事件監(jiān)聽 ?????function?addEvent(ele,type,handler){ ??????if(ele.addEventListener){console.log('1') ????????ele.addEventListener(type,handler,false); ??????} ??????else?if(ele.attachEvent){console.log('2') ????????ele.attachEvent('on'+type,handler); ??????}else{console.log('3') ????????ele['on'+type]=handler; ??????} ????} ????//?刪除事件監(jiān)聽 ????function?removeEvent(ele,type,handler){ ??????if(ele.removeEventListener){console.log('-1') ????????ele.removeEventListener(type,handler,false); ??????} ??????else?if(ele.detachEvent){console.log('-2') ????????ele.detachEvent('on'+type,handler); ??????}else{console.log('-3') ????????ele['on'+type]=handler; ??????} ????} ?????//DOM2級添加事件 ??????addEvent(drag,'mousedown',function(){ ????????xPanel=event.clientX-panel.offsetLeft; ????????yPanel=event.clientY-panel.offsetTop; ????????addEvent(document,'mousemove',function(event){ ????????dragPanel(event,xPanel,yPanel); ????????}) ????????addEvent(document,'mouseup',function(){ ??????????removeEvent(document,'mousemove',null); ??????????removeEvent(document,'mouseup',null); ????????}) })//DOM0級的 ???function?dragDown(){ ??????xPanel=event.clientX-panel.offsetLeft; ??????yPanel=event.clientY-panel.offsetTop; ??????document.onmousemove=function(event){ ????????dragPanel(event,xPanel,yPanel); ??????} ??????//?釋放鼠標(biāo) ??????document.onmouseup=function(){ ????????document.onmousemove=null; ????????document.onmouseup=null; ??????} ????}