http://www.typescriptlang.org/Playground/
TypeScript lets you write JavaScript the way you really want to.
TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.
Any browser. Any host. Any OS. Open Source.
var Greeter = (function () { function Greeter(message) { this.greeting = message; } Greeter.prototype.greet = function () { return "Hello, " + this.greeting; }; return Greeter; })(); var greeter = new Greeter("world"); var button = document.createElement(‘button‘); button.textContent = "Say Hello"; button.onclick = function () { alert(greeter.greet()); }; document.body.appendChild(button);
原文：http://www.cnblogs.com/freeliver54/p/4980115.html