首先定义一个Greeter的类

class Greeter {
    greeting: string;
    constructor(message: string) {
        this.greeting = message;
    greet() {
        return "Hello, " + this.greeting;
}

根据字符串动态创建Greeter类

//instance creation here
var greeter = Object.create(window["Greeter"].prototype);
greeter.constructor.apply(greeter, new Array("World"));
var button = document.createElement('button');