javascript-singleton.js

var Singleton = (function () {
    function Singleton() {
        this.asd = 'SSSSSS';
    }
    Singleton.prototype.Singleton = function () { };
    Singleton.getInstance = function () {
        return Singleton.INSTANCE;
    };
    Singleton.prototype.sayWhat = function (attr) {
        return attr;
    };
    Singleton.prototype.getAsd = function () {
        return this.asd;
    };
    Singleton.INSTANCE = new Singleton();
    return Singleton;
}());
var x1 = Singleton.getInstance().sayWhat('whhhhaaat?!?!');
var x2 = Singleton.getInstance();
console.log(x2.getAsd());

typescript-singleton.ts

class Singleton {
    private static INSTANCE:Singleton = new Singleton();
	private asd: string = 'SSSSSS';

    private Singleton() {}

    public static getInstance():Singleton {
        return Singleton.INSTANCE;
    }
	
    public sayWhat(attr: String):String {
        return attr;
    }
	
	public getAsd():String {
        return this.asd;
    }
}

var x1 = Singleton.getInstance().sayWhat('whhhhaaat?!?!');
var x2 = Singleton.getInstance();
console.log(x2.getAsd());