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在TypeScript中，类似于C#的结构，即一个文件中可以存在多个类，且文件名可以任意取，我们先看一个简单的类的示例。 1 class Person {
2 private name: string;
3 private age: number;
4
5 public constructor(name:string, age:number) {
6 this.name = name;
7 this.age = age;
8 }
9
10 public talk() {
11 alert("Hi, my name is " + this.name + ", i am " + this.age.toString() + "!");
12 }
13 }
14
15 function run() {
16 var p: Person = new Person("Li Lei", 18);
17 p.talk();
18 }
19
20 run();
TypeScript中的类需要注意下面几个点：
类的继承在TypeScript中，如何实现类的继承呢，请看如下示例： 1 class Person
2 {
3 private name: string;
4 private age: number;
5
6 constructor(name: string, age: number)
7 {
8 this.name = name;
9 this.age = age;
10 }
11
12 talk()
13 {
14 alert("Hi, my name is " + this.name + ", i am " + this.age.toString() + "!");
15 }
16 }
17
18 class Student extends Person
19 {
20 private school: string;
21
22 constructor(name: string, age: number, school: string)
23 {
24 super(name, age);
25 this.school = school;
26 }
27
28 talk()
29 {
30 super.talk();
31 alert("And I`m in " + this.school + "!");
32 }
33 }
34
35 function run()
36 {
37 var p: Person = new Student("Li Lei", 18, "English School");
38 p.talk();
39 }
40
41 run();
类的继承需要注意以下几点：
getter/setter封装在TypeScript中我们可以对一个成员变量进行getter和setter的封装，如下： 1 class Person
2 {
3 private _name:string;
4
5 constructor(name: string)
6 {
7 this._name = name;
8 }
9
10 set name(value:string) {this._name = value;}
11 get name() {return this._name;}
12
13 talk()
14 {
15 alert("Hi, my name is " + this.name + "!");
16 }
17 }
18
19 function run()
20 {
21 var p:Person = new Person(null);
22 p.name = "Li Lie";
23 p.talk();
24 }
25
26 run();
静态数据和方法在TypeScript中，是可以使用Static来定义静态变量及静态函数的，我们以单例类为例来看看： 1 class Person
2 {
3 private static _instance:Person;
4
5 static getInstance():Person
6 {
7 if(this._instance == null)
8 {
9 this._instance = new Person();
10 }
11 return this._instance;
12 }
13
14 talk()
15 {
16 alert("Hi, my name is Li Lie!");
17 }
18 }
19
20 function run()
21 {
22 Person.getInstance().talk();
23 }
24
25 run();
referenceTypeScript允许多个类在同一个文件里，但如果类与类在不同的文件，需要这种写法： 1 /// <reference path="SimpleWebSocket.ts"/>
2 class ComplexWebSocket extends SimpleWebSocket {
3 ...
4 }
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