jquery ajax提交 回调函数无法执行

function delcon(){
var reason=document.getElementById("sub_reason").value;
$.post(BASE_URL+"doctor/consultation/fpatients",{"sub_id":subid,"sub_reason":reason},function(data){
if(data==1){
alert('修改成功');
}else{
alert('修改失败');
}
},"json");
}

$.ajaxSetup({
async: false
});