open is a method while location is an objectlocation object
http://msdn.microsoft.com/workshop/author/dhtml/reference/objects/obj_location.aspopen Method
http://msdn.microsoft.com/workshop/author/dhtml/reference/methods/open_0.asp
http://msdn.microsoft.com/workshop/author/dhtml/reference/objects/obj_location.aspopen Method
http://msdn.microsoft.com/workshop/author/dhtml/reference/methods/open_0.asp
location是本窗口打开连接
location是改变当前窗口的资源位置