问Javascript :如何覆盖和包装父对象的方法？

EN

// sample library object
var o = {
     score: 5,
     work: function() {
                     console.log(this.score);
                }
};

// my code
var cons = function () {
     this.score = 10;
     this.work = function () {
          console. log("Hello");
           // how to call parent's work() ?
           // if I do this.prototype.work() -> prints 5
           // But parent's work should be called when this.score is 10
          console. log("Bye");
     };
 };
 cons.prototype = o;
 my_o = new cons();

 // my_o will be passed to 3rd party instead of o