javascript重写基类方法前调用.

Question

function Base(){
}
Base.prototype.say = function(){
 console.log(1);
}

function Sub(){

}
Sub.prototype = new Base();
Sub.prototype.say = function(){
 //todo: 不使用__proto__调用base.say();
 console.log('2');
}
var son  = new Sub();
son.say() // Expect: log: 1,2;

请问有什么方式可以实现吗?

Answer 1

function Base(){

}
Base.prototype.say = function(){
 console.log(1);
}

function Sub(){
}
Sub.prototype = new Base();
(function() {
    var _say = Sub.prototype.say;
    Sub.prototype.say = function(){
     //todo: 不使用__proto__调用base.say();
     _say.call(this);
     console.log('2');
    }
})()

var son  = new Sub();
son.say() // Expect: log: 1,2;