function MyClass() {

    this.a = "1a";

    this.b = "1b";

    this.c = 100;

    this.d = {

        da : "1da",

        dc : 200

    };

}

MyClass.prototype.isManual = function() {

    return true;

}

var myClass = new MyClass();

var json = JSON.stringify(myClass);

console.log(json)

console.log(myClass.isManual())

var json = JSON.stringify({"myClass": myClass, "haha": 1});

console.log(json)

{"a":"1a","b":"1b","c":100,"d":{"da":"1da","dc":200}}

true

{"myClass":{"a":"1a","b":"1b","c":100,"d":{"da":"1da","dc":200}},"haha":1}