js code like this

var test = testfactory.creat();
test.send({'xxx'});
test.onopen = function() {
    console.log('onopen');
}

c++ code like this

class testfactory {
public:
    mytest* creat() {
        reutrn new mytest();
   }
}
        

class mytest {
public:
    void send();
    void onopen();
}

so, how to create a object and return to js use google v8?