什么是任务管理系统？核心功能、主要作用与热门工具推荐

// 任务对象示例代码
class Task {
  constructor(title, description, assignee, dueDate, priority) {
    this.id = this.generateId();
    this.title = title;
    this.description = description;
    this.assignee = assignee;
    this.dueDate = dueDate;
    this.priority = priority; // 高、中、低
    this.status = '待开始'; // 待开始、进行中、已完成
    this.createdAt = new Date();
  }
  
  generateId() {
    return 'task_' + Math.random().toString(36).substr(2, 9);
  }
  
  updateStatus(newStatus) {
    this.status = newStatus;
  }
  
  // 其他任务相关方法...
}

// 创建新任务实例
const newTask = new Task(
  '完成项目报告',
  '撰写季度项目总结报告并提交审核',
  '张三',
  new Date('2024-03-15'),
  '高'
);

-- 任务管理系统数据库设计示例
CREATE TABLE Tasks (
    task_id INT PRIMARY KEY IDENTITY(1,1),
    title NVARCHAR(255) NOT NULL,
    description NVARCHAR(MAX),
    assignee_id INT FOREIGN KEY REFERENCES Users(user_id),
    due_date DATETIME,
    priority NVARCHAR(20) CHECK (priority IN ('低', '中', '高')),
    status NVARCHAR(20) DEFAULT '待开始',
    created_at DATETIME DEFAULT GETDATE(),
    updated_at DATETIME DEFAULT GETDATE()
);

CREATE TABLE Users (
    user_id INT PRIMARY KEY IDENTITY(1,1),
    username NVARCHAR(100) NOT NULL,
    email NVARCHAR(255) NOT NULL,
    department NVARCHAR(100)
);

-- 查询用户的任务分配情况
SELECT u.username, COUNT(t.task_id) as task_count
FROM Users u
LEFT JOIN Tasks t ON u.user_id = t.assignee_id
GROUP BY u.username
ORDER BY task_count DESC;