TypeScript简单的代码片段

TypeScript中，接口、接口实现、函数重载；

interface IThing{
    name:string;
    age:number;
    sayHello:{
        (name:string):string;
        (age:number):number;
    }
}

class Thing implements IThing{
    name:string;
    age:number;
    
    sayHello(name:string):string;
    sayHello(age:number):number;
    
    sayHello(arg:any):any{
        if(typeof arg === 'string'){
            return 'hello, ' + arg;
        }else if(typeof arg === 'number'){
            return arg*2;
        }else
        {
            throw new Error('invalid input args!!!');
        }
    }
}

interface ICar{
    engine:string;
}
class Car implements ICar{
    constructor(public engine:string){
    }
}
var thing = new Thing();
thing.name = 'paul cheung';
thing.age = 23;
thing.sayHello("this is a string~~~");
var car = new Car("Tesxt");
document.body.innerText = car.engine;

对应的javascript代码:

var Thing = (function () {
    function Thing() {
    }
    Thing.prototype.sayHello = function (arg) {
        if (typeof arg === 'string') {
            return 'hello, ' + arg;
        } else if (typeof arg === 'number') {
            return arg * 2;
        } else {
            throw new Error('invalid input args!!!');
        }
    };
    return Thing;
})();

var Car = (function () {
    function Car(engine) {
        this.engine = engine;
    }
    return Car;
})();
var thing = new Thing();
thing.name = 'paul cheung';
thing.age = 23;
thing.sayHello("this is a string~~~");
var car = new Car("Tesxt");
document.body.innerText = car.engine;

---

TypeScript类定义和继承、module定义及使用:

class Auto{
    engine:string;
    constructor(engine:string){
        this.engine = engine;
    }
}

class Truck extends Auto{
    bigTires:bool;
    constructor(engine:string,bigTires:bool){
        super(engine);
        this.bigTires = bigTires;
    }
}

module Shapes{
   export class Person{
        constructor(
            public name:string,
            public age:number
        ){}
    }    
}
var p = new Shapes.Person("paul cheung", 21)

///<reference path='shapes.ts'/>

javascript代码:

var __extends = this.__extends || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    __.prototype = b.prototype;
    d.prototype = new __();
};
var Auto = (function () {
    function Auto(engine) {
        this.engine = engine;
    }
    return Auto;
})();

var Truck = (function (_super) {
    __extends(Truck, _super);
    function Truck(engine, bigTires) {
        _super.call(this, engine);
        this.bigTires = bigTires;
    }
    return Truck;
})(Auto);

var Shapes;
(function (Shapes) {
    var Person = (function () {
        function Person(name, age) {
            this.name = name;
            this.age = age;
        }
        return Person;
    })();
    Shapes.Person = Person;
})(Shapes || (Shapes = {}));
var p = new Shapes.Person("paul cheung", 21);

using http://www.typescriptlang.org/playground/ to do demo~~~