export default class Hello
{
    _name: string = "abc";
    get name()
    {
        console.log("原始 get name ");
        return this._name;
    }

    set name(v:string)
    {
        
        console.log("原始 set name ", v);
        this._name = v;
    }
}


export  class HelloExtend
{
    static Init()
    {
        var name_source = Object.getOwnPropertyDescriptor(Hello.prototype, "name");
        Object.defineProperty(Hello.prototype, "name", 
        {
            get: function () 
            {
                console.log("扩展 get name");
                return name_source.get();
            },

            set: function (v) 
            {
                console.log("扩展 set name", v);
                name_source.set(v + "---abcdefg");
            },
            enumerable: true,
            configurable: true
        });
    }
}

		HelloExtend.Init();
		var h = new Hello();
		console.log(h.name);
		h.name = 'aa';
		console.log(h.name);