如何循环html数据制作[{},{}]格式，向后台传递多个数据

var allobject=[ ];

$(‘.P_center‘).each(function(){
                //获取对象所需要的值
                var courseId = $(this).data(‘id‘);
                var buyNum = $(this).data(‘quantity‘);
                var buyPrice = $(‘.P_su‘).text();

               //将获取好的值保存到对象中
                var object = {
                    "courseId":courseId,
                    "buyNum":buyNum,
                    "buyPrice":buyPrice
                }
               //将对象保存到数组中
                
                allobject.push(object );
            });
           //将数组转换为json类型的字符串
           var allobjectJSON = JSON.stringify(allobject);