訂單管理系統分析及改進

Lucaba發表於2024-03-07

一、來源
來自我的一個室友，他稱自己為“C羅”，是他一年前學習c++時練手所寫。
二、執行環境+執行結果截圖

點選檢視程式碼

#include "menu.h"

void Menu::readFile()
{
	ifstream ifs;
	ifs.open("Menu.txt", ios::out);
	int n = 0;
	ifs >> n;
	for (int i = 0; i < n; i++)
	{
		Menu m;
		ifs >> m.m_number >> m.m_name >> m.m_price >> m.m_cost;
		menuList.push_back(m);
	}
	ifs.close();
}

void Menu::init()
{
	this->readFile();
}

void Menu::writeFile()
{
	ofstream ofs;
	ofs.open("Menu.txt", ios::out);
	ofs << menuList.size() << endl; //先寫入選單數量
	for (int i = 0; i < menuList.size(); i++)
	{
		ofs << menuList[i].m_number << " " << menuList[i].m_name << " " << menuList[i].m_price << " " << menuList[i].m_cost << endl;
	}
	ofs.close();
}

void Menu::showAllDish()
{
	system("cls");
	cout << "\t\t-----------------------------------------------------------------------" << endl;
	cout << "\t\t";
	Menu::showHeader();
	cout << "\t\t-----------------------------------------------------------------------" << endl;
	for (int i = 0; i < menuList.size(); i++)
	{
		cout << "\t\t";
		menuList[i].showDishInfo();
	}
	cout << "\t\t-----------------------------------------------------------------------" << endl;
	cout << "\t\t";
	system("pause");
}

void Menu::showHeader()
{
	cout << left << setw(12) << "菜號";
	cout << left << setw(10) << "菜名";
	cout << left << setw(6) << "價格";
	cout << left << setw(8) << "成本" << endl;

}

void Menu::showDishInfo()
{
	cout << left << setw(12) << m_number;
	cout << left << setw(10) << m_name;
	cout << left << setw(6) << m_price;
	cout << left << setw(8) << m_cost << endl;
}

void Menu::showMenu()
{
	//主選單
	string sel = "0";
	system("cls");
	cout << "\t\t\t**********歡迎來到選單管理系統**********" << endl;
	cout << "\t\t\t你可以進行以下操作:" << endl;
	cout << "\t\t\t|------------------------------------------|" << endl;
	cout << "\t\t\t|             1   新增新的選單             |" << endl;
	cout << "\t\t\t|------------------------------------------|" << endl;
	cout << "\t\t\t|             2   刪除一個選單             |" << endl;
	cout << "\t\t\t|------------------------------------------|" << endl;
	cout << "\t\t\t|             3   顯示選單資訊             |" << endl;
	cout << "\t\t\t|------------------------------------------|" << endl;
	cout << "\t\t\t|             0   退出                     |" << endl;
	cout << "\t\t\t|------------------------------------------|" << endl;
	cout << "\t\t\t請選擇【0-3】：";
	cin >> sel;
	while (sel != "0" && sel != "1" && sel != "2" && sel != "3"/* && sel != "4"*/)
	{
		cout << "\t\t\t輸入不合法,請重新選擇【0-3】：";
		cin >> sel;
	}
	if (sel == "1")
	{
		this->insertDish();
		this->showMenu();
	}
	else if (sel == "2")
	{
		this->deleteDish();
		this->showMenu();
	}
	else if (sel == "3")
	{
		this->showAllDish();
		this->showMenu();
	}
	else if (sel == "0")
	{
		exit(0);
	}
}

void Menu::insertDish()
{
	while (true)
	{
		system("cls");
		cout << "\t\t**********************歡迎來到新增選單功能*************************" << endl;
		cout << "\t\t當前已有選單：" << endl;
		showAllDish();
		cout << endl;
		cout << "\t\t------------------" << endl;
		cout << "\t\t1 新增選單資訊" << endl;
		cout << "\t\t2 返回主選單" << endl;
		cout << "\t\t------------------" << endl;
		cout << "\t\t請選擇【1-2】：";
		string select;
		cin >> select;
		while (select != "1" && select != "2")
		{
			cout << "\t\t輸入不合法，請重新輸入";
			cin >> select;
		}
		if (select == "1")
		{
			string flag = "1";
			while (flag == "1")
			{
				cout << "\t\t請輸入選單號" << endl;
				cout << "\t\t選單號： ";
				Menu m;
				bool check = false;
				do
				{
					check = false;
					cin >> m.m_number;
					for (int i = 0; i < m.menuList.size(); i++)
					{
						if (m.m_number == menuList[i].m_number)
						{
							cout << "\t\t該單號已存在，請重新輸入： ";
							check = true;
							break;
						}
					}
				} while (check);
				cout << "\t\t菜名： ";
				cin >> m.m_name;
				cout << "\t\t價格： ";
				cin >> m.m_price;
				cout << "\t\t成本：";
				cin >> m.m_cost;
				menuList.push_back(m);
				writeFile();
				cout << "\n\t\t該選單資訊新增成功！是否繼續新增？（1 是 0 否）" << endl;
				cout << "\t\t請進行選擇【0-1】：";
				cin >> flag;
				while (flag != "0" && flag != "1")
				{
					cout << "\t\t輸入不合法,請重新選擇【0-1】：";
					cin >> flag;
				}
			}
			cout << "\t\t";
			system("pause");
		}
		else
		{
			break;
		}
	}
}

void Menu::deleteDish()
{
	while (true)
	{
		system("cls");
		cout << "\t\t***********************歡迎來到刪除選單資訊功能***********************" << endl;
		string sel = "0";
		cout << "\t\t-----------------" << endl;
		cout << "\t\t1 選擇待刪菜號" << endl;
		cout << "\t\t2 返回主選單" << endl;
		cout << "\t\t-----------------" << endl;
		cout << "\t\t請進行選擇【1-2】" << endl;
		cin >> sel;
		while (sel != "1" && sel != "2")
		{
			cout << "\t\t輸入不合法,請重新選擇【1-2】：";
			cin >> sel;
		}
		if (sel == "1")
		{
			int keyNum;
			bool flag = false;
			cout << "\t\t請輸入待刪除的菜號： ";
			cin >> keyNum;
			for (vector<Menu>::iterator it = menuList.begin(); it != menuList.end(); ++it)
			{
				if (it->m_number == keyNum)
				{
					flag = true;
					cout << "\t\t待刪除的選單資訊如下： " << endl;
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					Menu::showHeader();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					it->showDishInfo();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t確認刪除？（1 是 0 否）" << endl;
					cout << "\t\t請進行選擇【0-1】：";
					string ch = "0";
					cin >> ch;
					while (ch != "0" && ch != "1")
					{
						cout << "\t\t輸入不合法,請重新選擇【0-1】：";
						cin >> ch;
					}
					if (ch == "0") break;
					else
					{
						menuList.erase(it);
						writeFile();
						cout << "\t\t刪除成功！" << endl;
						break;
					}
				}
			}
			if (!flag) cout << "\t\t查無此號，無法刪除！\n" << endl;
			cout << "\t\t";
			system("pause");
		}
		else
		{
			break;
		}
	}

}

點選檢視程式碼

#include "order.h"
#include <iostream>
using namespace std;
#include <vector>
#include <algorithm>
#include <iomanip>
#include "menu.h"
void order::init()
{
	readFile();
}

void order::showHeader()
{
	cout << left << setw(12) << "單號";
	cout << left << setw(10) << "時間";
	cout << left << setw(6) << "人數";
	cout << left << setw(8) << "總價";
	cout << left << setw(23) << "菜號";
	cout << left << setw(6) << "數量" << endl;
}

void order::showListInfo()
{
	cout << left << setw(12) << m_number;
	cout << left << setw(10) << m_time;
	cout << left << setw(6) << m_customers;
	cout << left << setw(8) << m_price;
	cout << left << setw(23) << menu_number;
	cout << left << setw(6) << menu_count << endl;
}

void order::showAllList()
{
	system("cls");
	cout << "\t\t-----------------------------------------------------------------------" << endl;
	cout << "\t\t";
	order::showHeader();
	cout << "\t\t-----------------------------------------------------------------------" << endl;
	for (int i = 0; i < ordList.size(); i++)
	{
		cout << "\t\t";
		ordList[i].showListInfo();
	}
	cout << "\t\t-----------------------------------------------------------------------" << endl;
	cout << "\t\t";
	system("pause");
}

void order::readFile()
{
	ifstream ifs;
	ifs.open("ordList.txt", ios::out);
	int n = 0;
	ifs >> n;
	for (int i = 0; i < n; i++)
	{
		order o;
		ifs >> o.m_number >> o.m_time >> o.m_customers >> o.m_price >> o.menu_number >> o.menu_count;
		ordList.push_back(o);
	}
	ifs.close();
}

void order::writeFile() 
{
	ofstream ofs;
	ofs.open("ordList.txt", ios::out);
	ofs << ordList.size() << endl; //先寫入訂單數量
	for (int i = 0; i < ordList.size(); i++)
	{
		ofs << ordList[i].m_number << " " << ordList[i].m_time << " " << ordList[i].m_customers
			<< " " << ordList[i].m_price << " " << ordList[i].menu_number << " " << ordList[i].menu_count << endl;
	}
	ofs.close();
}

void order::showMenu()
{
//主選單
		string sel = "0";
		system("cls");
		cout << "\t\t\t**********歡迎來到訂單管理系統**********" << endl;
		cout << "\t\t\t你可以進行以下操作:" << endl;
		cout << "\t\t\t             1   新增訂單資訊             |" << endl;
		cout << "\t\t\t             2   刪除訂單資訊             |" << endl;
		cout << "\t\t\t             3   查詢訂單資訊             |" << endl;
		cout << "\t\t\t             4   進入選單管理             |" << endl;
		cout << "\t\t\t             5   統計營收資料             |" << endl;
		cout << "\t\t\t             6   清空系統資料             |" << endl;
		cout << "\t\t\t             0   退出                     |" << endl;
		cout << "\t\t\t請選擇【0-6】：";
		cin >> sel;
		while (sel != "0" && sel != "1" && sel != "2" && sel != "3" && sel != "4" && sel != "5" && sel != "6" )
		{
			cout << "\t\t\t輸入不合法,請重新選擇【0-6】：";
			cin >> sel;
		}
		if (sel == "1")
		{
			this->insertList();
			this->showMenu();
		}
		else if (sel == "2")
		{
			this->deleteList();
			this->showMenu();
		}
		else if (sel == "3")
		{
			showAllList();
			this->showMenu();
		}
		else if (sel == "4")
		{
			Menu m;
			m.init();
			m.showMenu();
			this->showMenu();
		}
		else if (sel == "5")
		{
			this->sumProfits();
			this->showMenu();
		}
		else if (sel == "6")
		{
			this->clearList();
			this->showMenu();
		}
		else if (sel == "0")
		{
			exit(0);
		}
}

void order::insertList()
{
	while (true)
	{
		system("cls");
		cout << "\t\t**********************歡迎來到新增訂單功能*************************" << endl;
		cout << "\t\t當前已有訂單：" << endl;
		showAllList();
		cout << endl;
		cout << "\t\t------------------" << endl;
		cout << "\t\t1 新增訂單資訊" << endl;
		cout << "\t\t2 返回主選單" << endl;
		cout << "\t\t------------------" << endl;
		cout << "\t\t請選擇【1-2】：";
		string select;
		cin >> select;
		while (select != "1" && select != "2")
		{
			cout << "\t\t輸入不合法，請重新輸入";
			cin >> select;
		}
		if (select == "1")
		{
			string flag = "1";
			while (flag=="1")
			{
				cout << "\t\t請輸入訂單號" << endl;
				cout << "\t\t訂單號： ";
				order o;
				bool check = false;
				do
				{
					check = false;
					cin >> o.m_number;
					for (int i = 0; i < o.ordList.size(); i++)
					{
						if (o.m_number == ordList[i].m_number)
						{
							cout << "\t\t該單號已存在，請重新輸入： ";
							check = true;
							break;
						}
					}
				} while (check);
				cout << "\t\t下單時間： ";
				cin >> o.m_time;
				cout << "\t\t就餐人數： ";
				cin >> o.m_customers;
				cout << "\t\t訂單總價： ";
				cin >> o.m_price;
				cout << "\t\t菜號： ";
				cin >> o.menu_number;
				cout << "\t\t數量：";
				cin >> o.menu_count;
				ordList.push_back(o);
				writeFile();
				cout << "\n\t\t該訂單資訊新增成功！是否繼續新增？（1 是 0 否）" << endl;
				cout << "\t\t請進行選擇【0-1】：";
				cin >> flag;
				while (flag != "0" && flag != "1")
				{
					cout << "\t\t輸入不合法,請重新選擇【0-1】：";
					cin >> flag;
				}
			}
			cout << "\t\t";
			system("pause");
		}
		else
		{
			break;
		}
	}
}

void order::deleteList()
{
	while (true)
	{
		system("cls");
		cout << "\t\t***********************歡迎來到刪除訂單資訊功能***********************" << endl;
		string sel = "0";
		cout << "\t\t-----------------" << endl;
		cout << "\t\t1 按單號刪除" << endl;
		cout << "\t\t2 按時間刪除" << endl;
		cout << "\t\t3 返回主選單" << endl;
		cout << "\t\t-----------------" << endl;
		cout << "\t\t請進行選擇【1-3】" << endl;
		cin >> sel;
		while (sel != "1" && sel != "2" && sel != "3")
		{
			cout << "\t\t輸入不合法,請重新選擇【1-3】：";
			cin >> sel;
		}
		if (sel == "1")
		{
			int keyNum;
			bool flag = false;
			cout << "\t\t請輸入待刪除的單號： ";
			cin >> keyNum;
			for (vector<order>::iterator it = ordList.begin(); it != ordList.end(); ++it)
			{
				if (it->m_number == keyNum)
				{
					flag = true;
					cout << "\t\t待刪除的訂單資訊如下： " << endl;
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					order::showHeader();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					it->showListInfo();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t確認刪除？（1 是 0 否）" << endl;
					cout << "\t\t請進行選擇【0-1】：";
					string ch = "0";
					cin >> ch;
					while (ch != "0" && ch != "1")
					{
						cout << "\t\t輸入不合法,請重新選擇【0-1】：";
						cin >> ch;
					}
					if (ch == "0") break;
					else
					{
						ordList.erase(it);
						writeFile();
						cout << "\t\t刪除成功！" << endl;
						break;
					}
				}
			}
			if (!flag) cout << "\t\t查無此單，無法刪除！\n" << endl;
			cout << "\t\t";
			system("pause");
		}
		else if (sel == "2")
		{
			int keyTime;
			bool flag = false;
			cout << "\t\t請輸入待刪除訂單的時間：";
			cin >> keyTime;
			for (vector<order>::iterator it = ordList.begin(); it != ordList.end(); ++it)
			{
				if (it->m_time == keyTime)
				{
					flag = true;
					cout << "\t\t待刪除單號的資訊如下：" << endl;
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t\t";
					order::showHeader();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					it->showListInfo();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t確認刪除？（1 是 0 否）" << endl;
					cout << "\t\t請進行選擇【0-1】：";
					string ch = "0";
					cin >> ch;
					while (ch != "0" && ch != "1")
					{
						cout << "\t\t輸入不合法,請重新選擇【0-1】：";
						cin >> ch;
					}
					if (ch == "0") break;
					else
					{
						ordList.erase(it);
						writeFile();
						cout << "\t\t刪除成功！" << endl;
						break;
					}
				}
			}
			if (!flag) cout << "\t\t查無此單，無法刪除！\n" << endl;
			cout << "\t\t";
			system("pause");
		}
		else
		{
			break;
		}
	}

}

void order::clearList()
{
	while (true)
	{
		string sel = "0";
		system("cls");
		cout << "\t\t**************歡迎來到清空系統資料功能***************" << endl;
		cout << "\t\t------------------" << endl;
		cout << "\t\t1 確認清空系統資料" << endl;
		cout << "\t\t2 返回主選單" << endl;
		cout << "\t\t------------------" << endl;
		cout << "\t\t請慎重選擇【1-2】：";
		cin >> sel;
		while (sel != "1" && sel != "2")
		{
			cout << "\t\t輸入不合法,請重新輸入【1-2】：";
			cin >> sel;
		}
		if (sel == "1")
		{
			ordList.clear();
			cout << "\t\t清空成功！" << endl;
			cout << "\t\t";
			system("pause");
			writeFile();
		}
		else
		{
			break;
		}
	}

}

void order::sumProfits()
{
	system("cls");
	double sum = 0;
	for (vector<order>::iterator it = ordList.begin(); it < ordList.end(); ++it)
	{
		sum += it->m_price;
	}
	cout << "\t\t\t總計賣出" << sum << "元" << endl;
	system("pause");
}

點選檢視程式碼

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <string>
#include "order.h"
#include "menu.h"
using namespace std;
int main()
{
	order od;
	od.init();
	od.showMenu();
	return 0;
}

![](https://img2024.cnblogs.com/blog/3398664/202403/3398664-20240307002336658-1549795652.png) ![](https://img2024.cnblogs.com/blog/3398664/202403/3398664-20240306234704805-122730950.png) ![](https://img2024.cnblogs.com/blog/3398664/202403/3398664-20240306234736906-589735721.png) ![](https://img2024.cnblogs.com/blog/3398664/202403/3398664-20240306234812739-1700416321.png) ![](https://img2024.cnblogs.com/blog/3398664/202403/3398664-20240306234850031-1614593422.png) ![](https://img2024.cnblogs.com/blog/3398664/202403/3398664-20240306234900919-1008845268.png)

三、主要問題列表、針對問題所需的改善和重構
總體寫的非常細緻全面，只是存在一個小小的缺憾。這也是當時他想完成但沒能完成的內容。就是增加系統的“修改訂單選項”，這是當時的一個難點。
因此，此次我將個人的想法在原先基礎上做了補充，使得系統更加全面合理。此外，我還在部分排版，迴圈處理等方面做了小的修改，使得執行看上去更加清晰整潔。

四、新程式碼附上

點選檢視程式碼

void Menu::updateDish()
{
	while (true)
	{
		system("cls");
		cout << "\t\t***********************歡迎來到修改選單資訊功能***********************" << endl;
		string sel = "0";
		cout << "\t\t-----------------" << endl;
		cout << "\t\t1 修改選單基本資訊" << endl;
		cout << "\t\t2 返回主選單" << endl;
		cout << "\t\t-----------------" << endl;
		cout << "\t\t請進行選擇【1-2】：";
		cin >> sel;
		while (sel != "1" && sel != "2")
		{
			cout << "\t\t輸入不合法,請重新選擇【1-3】：";
			cin >> sel;
		}

		if (sel == "1")
		{
			bool flag = false;
			int keyNum;
			cout << "\t\t請輸入待修改選單的單號：";
			cin >> keyNum;
			for (int i = 0; i < menuList.size(); i++)
			{
				if (menuList[i].m_number == keyNum)
				{
					flag = true;
					cout << "\t\t待修改選單基本資訊如下：" << endl;
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					Menu::showHeader();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					menuList[i].showDishInfo();
					cout << "\t\t-----------------------------------------------------------------------" << endl;

					Menu s = menuList[i];
					cout << "\t\t請輸入修改後的單號：";
					bool check = false;
					do
					{
						check = false;
						cin >> s.m_number;
						for (int j = 0; j < menuList.size(); ++j)
						{
							if (s.m_number == menuList[j].m_number && i != j)
							{
								cout << "\t\t該單號已被錄入，請重新輸入單號：";
								check = true;
								break;
							}
						}
					} while (check);
					cout << "\t\t請輸入修改後的菜號：";
					cin >> s.m_number;
					cout << "\t\t請輸入修改後的菜名：";
					cin >> s.m_name;
					cout << "\t\t請輸入修改後的價格：";
					cin >> s.m_price;
					cout << "\t\t請輸入修改後的成本：";
					cin >> s.m_cost;
					cout << "\t\t是否確認修改？（1 是 0 否）" << endl;
					cout << "\t\t請進行選擇【0-1】：";
					string ch = "0";
					cin >> ch;
					while (ch != "0" && ch != "1")
					{
						cout << "\t\t輸入不合法,請重新選擇【0-1】：";
						cin >> ch;
					}

					if (ch == "0") break;
					else
					{
						menuList[i] = s;
						cout << "\t\t修改成功！" << endl;
						writeFile();
						break;
					}
				}
			}
			if (!flag) cout << "\t\t查無此號，無法修改！\n" << endl;
		}
		else
		{
			break;
		}
		cout << "\t\t";
		system("pause");
	}
}

點選檢視程式碼

void order::updateList()
{
	while (true)
	{
		system("cls");
		cout << "\t\t***********************歡迎來到修改訂單資訊功能***********************" << endl;
		string sel = "0";
		cout << "\t\t-----------------" << endl;
		cout << "\t\t1 修改訂單基本資訊" << endl;
		cout << "\t\t2 返回主選單" << endl;
		cout << "\t\t-----------------" << endl;
		cout << "\t\t請進行選擇【1-2】：";
		cin >> sel;
		while (sel != "1" && sel != "2")
		{
			cout << "\t\t輸入不合法,請重新選擇【1-3】：";
			cin >> sel;
		}

		if (sel == "1")
		{
			bool flag = false;
			int keyNum;
			cout << "\t\t請輸入待修改訂單的單號：";
			cin >> keyNum;
			for (int i = 0; i < ordList.size(); i++)
			{
				if (ordList[i].m_number == keyNum)
				{
					flag = true;
					cout << "\t\t待修改訂單基本資訊如下：" << endl;
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					order::showHeader();
					cout << "\t\t-----------------------------------------------------------------------" << endl;
					cout << "\t\t";
					ordList[i].showListInfo();
					cout << "\t\t-----------------------------------------------------------------------" << endl;

					order s = ordList[i];
					cout << "\t\t請輸入修改後的單號：";
					bool check = false;
					do
					{
						check = false;
						cin >> s.m_number;
						for (int j = 0; j < ordList.size(); ++j)
						{
							if (s.m_number == ordList[j].m_number && i != j)
							{
								cout << "\t\t該單號已被錄入，請重新輸入單號：";
								check = true;
								break;
							}
						}
					} while (check);
					cout << "\t\t請輸入修改後的時間：";
					cin >> s.m_time;
					cout << "\t\t請輸入修改後的就餐人數：";
					cin >> s.m_customers;
					cout << "\t\t請輸入修改後的總價：";
					cin >> s.m_price;
					cout << "\t\t請輸入修改後的菜號：";
					cin >> s.menu_number;
					cout << "\t\t請輸入修改後的數量：";
					cin >> s.menu_count;
					cout << "\t\t是否確認修改？（1 是 0 否）" << endl;
					cout << "\t\t請進行選擇【0-1】：";
					string ch = "0";
					cin >> ch;
					while (ch != "0" && ch != "1")
					{
						cout << "\t\t輸入不合法,請重新選擇【0-1】：";
						cin >> ch;
					}

					if (ch == "0") break;
					else
					{
						ordList[i] = s;
						cout << "\t\t修改成功！" << endl;
						writeFile();
						break;
					}
				}
			}
			if (!flag) cout << "\t\t查無此人，無法修改！\n" << endl;
		}
		else
		{
			break;
		}
		cout << "\t\t";
		system("pause");
	}
}

五、重構的軟體測試截圖

六、總結
當修改程式碼時，我會首先仔細閱讀原始程式碼，確保我充分理解其功能和邏輯。然後，我會考慮程式碼可能存在的問題或需要改進的地方。在修改程式碼的過程中，我會盡量保持程式碼風格的一致性。最後，我會進行測試，確保修改後的程式碼能夠正常執行並達到預期的效果。這次修改的主要難點是對原有內容的修改，這一部分我起初也並沒有掌握，然後透過網上的一些學習，最終實現了這一功能。
過程很是艱辛，看懂程式碼也需要耐心，雖然麻煩，但是真正實現還是很有成就感的。

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