设计模式之组合模式设计模式

组合模式是一种树状结构的专用模式，主要用来组合对象。它可以比较清晰的显示出部分和整体层次，因为这种模式的妙用在于整合而不是创建，因此我们常把他看做结构型模式的一种。

场景描述

某公司CEO下设有销售经理和市场经理，两个经理下各自有自己的下属员工，现遍历公司人员结构树，打印所有人员的薪资职位等状况。
【设计模式之组合模式】

文章图片

代码实现

下面是改写自菜鸟教程的一段示例代码：

class Employee { name: string; dept: string; salary: number; subordinates: Array; constructor(name: string, dept: string, sal: number) { this.name = name; this.dept = dept; this.salary = sal; this.subordinates = []; } add(e: Employee): void { this.subordinates.push(e) } remove(e: Employee): void { let n = this.subordinates.indexOf(e); this.subordinates.splice(n, -1); } getSubordinates(): Array { return this.subordinates; } toString(): string {return ("Employee :[ Name : "+ this.name +", dept : "+ this.dept + ", salary :" + this.salary+" ]") } }let CEO:Employee = new Employee("John","CEO", 30000); let headSales:Employee = new Employee("Robert","Head Sales", 20000); let headMarketing:Employee = new Employee("Michel","Head Marketing", 20000); let clerk1:Employee = new Employee("Laura","Marketing", 10000); let clerk2:Employee = new Employee("Bob","Marketing", 10000); let salesExecutive1:Employee = new Employee("Richard","Sales", 10000); let salesExecutive2:Employee = new Employee("Rob","Sales", 10000); CEO.add(headSales); CEO.add(headMarketing); headSales.add(salesExecutive1); headSales.add(salesExecutive2); headMarketing.add(clerk1); headMarketing.add(clerk2); //打印该组织的所有员工 console.log(CEO.toString()); for (let headEmployee of CEO.getSubordinates()) { console.log(headEmployee.toString()); for (letemployee of headEmployee.getSubordinates()) { console.log(employee.toString()); } }

程序运行结果：