ajax传参过长问题怎么解决

我的代码
var url="DataBase.aspx?txtSubPlateId="+encodeURI(encodeURI(txtSubPlateId))+"&mood="+mood+"&topic="+encodeURI(encodeURI(topic))+"&webEd="+encodeURI(encodeURI(webEd))+"&typeid="+encodeURI(encodeURI(typeid))+"&txtIp="+txtIp+"&Event=Fa";
                http_request.onreadystatechange=up;
                http_request.open("POST",url,true);
                http_request.send(null);