向原型添加属性的最佳模式是什么

Question

以下是添加我需要的方法的三个选项 原型。我想知道是否有任何问题 任何这些模式。使用这样的原型是否有所不同，或者它们只是以不同的方式编写它们。

每次选项运行后，我都可以拨打egg().alertMe();

这些只是提出问题的简单方法。

感谢您的帮助。

// option 1
// Methods are added to the egg functions prototype
// individually and the newly created
// objects prototype points to this prototype.
var egg = function() {

        return new egg.init();

};

egg.prototype.alertMe = function () {alert('alertMe');};
egg.prototype.logMe = function () {console.log('logMe');};

// constructor function
egg.init = function() {};

egg.init.prototype = egg.prototype;

// option 2
// Methods are added to the egg functions prototype
// in an object literal and the newly created
// objects prototype points to this prototype.
var egg = function() {

        return new egg.init();

};

egg.prototype = {
        // Alert me.
        alertMe: function () {alert('alertMe');},
        // Log me.
        logMe: function () {console.log('logMe');}
    };

// constructor function
egg.init = function() {};

egg.init.prototype = egg.prototype;

// option 3
// Just add the methods to the the newly created
// objects prototype.

var egg = function() {

        return new egg.init();

};

// constructor function
egg.init = function() {};


egg.init.prototype = {
        // Alert me.
        alertMe: function () {alert('alertMe');},
        // Log me.
        logMe: function () {console.log('logMe');}
};