function addEvent(elem,type,handle){ if (elem.addEventlistener) { elem.addEventlistener(type,handle,false); }else if (elem.attachEvent) { elem.attachEvent('on'+type,function(){ handle.call(elem); }); }else { elem['on'+type] = handle; } }
handle.call(elem);ie9以下支持,但是this指向window,所以把指向改为事件对象