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TypeScript 类
从ECMAScript 6开始,JS就支持类了.但是如果使用TypeScript也能使用类,并且生成的JS任然可以使用.
来一个例子:
/** * Created by CV-PC153 on 2017/8/9. */ //创建一个类 class Greeter{ private greeting : string; constructor(message : string){ this.greeting = message; } public greet():string{ return `Hello, ${this.greeting}`; } } //实例化Greeter类 let my_greeter : Greeter = new Greeter("World"); document.body.innerHTML = my_greeter.greet();
用此生成的JS:
/** * Created by CV-PC153 on 2017/8/9. */ //锟斤拷锟斤拷一锟斤拷锟斤拷 var Greeter = (function () { function Greeter(message) { this.greeting = message; } Greeter.prototype.greet = function () { return "Hello, " + this.greeting; }; return Greeter; }()); //实锟斤拷锟斤拷Greeter锟斤拷 var my_greeter = new Greeter("World"); document.body.innerHTML = my_greeter.greet();
运行得到的结果:
继承:::
/** * Created by CV-PC153 on 2017/8/9. */ class Monster{ protected name : string; constructor( name : string ){ this.name = name; } public attack() : string{ return `${this.name} attack`; } } //哥斯拉 class Godzilla extends Monster{ constructor(){ super("gesila"); } public attack():string{ console.log(`${this.name} launched an attack use fire`); return super.attack(); } } //美杜莎 class Medusa extends Monster{ constructor(){ super("meidusha"); } public attack():string{ console.log(`${this.name} launched an attack use eyes`); return super.attack(); } } let gsl : Monster = new Godzilla(); document.body.innerHTML = gsl.attack();
值得注意的是,重写基类方法,没有override关键字.
生成的JS比较复杂,如下:
var __extends = (this && this.__extends) || (function () { var extendStatics = Object.setPrototypeOf || ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) || function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; }; return function (d, b) { extendStatics(d, b); function __() { this.constructor = d; } d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); }; })(); /** * Created by CV-PC153 on 2017/8/9. */ var Monster = (function () { function Monster(name) { this.name = name; } Monster.prototype.attack = function () { return this.name + " attack"; }; return Monster; }()); //锟斤拷斯锟斤拷 var Godzilla = (function (_super) { __extends(Godzilla, _super); function Godzilla() { return _super.call(this, "gesila") || this; } Godzilla.prototype.attack = function () { console.log(this.name + " launched an attack use fire"); return _super.prototype.attack.call(this); }; return Godzilla; }(Monster)); //锟斤拷锟斤拷莎 var Medusa = (function (_super) { __extends(Medusa, _super); function Medusa() { return _super.call(this, "meidusha") || this; } Medusa.prototype.attack = function () { console.log(this.name + " launched an attack use eyes"); return _super.prototype.attack.call(this); }; return Medusa; }(Monster)); var gsl = new Godzilla(); document.body.innerHTML = gsl.attack();
结果如下:
关于 , 参数属性 (可以与定义参数融为一体)
代码如下:
constructor( protected name : string) {}
存储器: getter / setter
get _name():string{ return this.name; } set _name( value : string ){ this.name = value; }
和AS3很像
但是编译的时候一定要注意
不然就会如下编译错误:
抽象类:
/** * Created by CV-PC153 on 2017/8/9. */ abstract class Monster{ constructor( protected name : string) {} public abstract attack() : string; get _name():string{ return this.name; } set _name( value : string ){ this.name = value; } } //哥斯拉 class Godzilla extends Monster{ constructor(){ super("gesila"); } public attack():string{ return `${this.name} launched an attack use fire`; } } //美杜莎 class Medusa extends Monster{ constructor(){ super("meidusha"); } public attack():string{ return `${this.name} launched an attack use eyes`; } } let gsl : Monster = new Godzilla(); document.body.innerHTML = gsl.attack();
得到结果:
本文出自 “Better_Power_Wisdom” 博客,请务必保留此出处http://aonaufly.blog.51cto.com/3554853/1954778
TypeScript 类
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