属于JavaScript对象原型的回调函数可以访问对象成员吗？

function Obji(param){
   this.element = param;
}

Obji.prototype.func(){
   database.get(\"someKey\",this.cb);
}

Obji.prototype.cb(){
   //here I would like to access this.element
}

database.get(\"someKey\",this.cb.bind(this));

.bind

Obji.prototype.func = function(){
   var ref = this;
   database.get(\"someKey\", function(){ref.cb()});
}