//contextmenu()表示右键菜单触发的时候
$(document).contextmenu(function(event){
x=event.clientX;
y=event.clientY;
btn=event.button;
if(btn==2){
$('ul').show().css({'left':x+'px','top':y+'px'});
return false;
}
});
//clientX与offset
function start(event) {
deltaX=event.clientX-obj.offset().left;
deltaY=event.clientY-obj.offset().top;
}
