将继承与模块模式相结合

时间:2011-12-30 19:19:16

标签: javascript inheritance module design-patterns

我喜欢返回构造函数的模块模式,如下所述: http://elegantcode.com/2011/02/15/basic-javascript-part-10-the-module-pattern/

但是我不确定如何从使用此模式实现的对象继承。假设我有一个父对象实现...

namespace('MINE');  

MINE.parent = (function() { 
    // private funcs and vars here

    // Public API - constructor
    var Parent = function (coords) {
       // ...do constructor stuff here
    };

    // Public API - prototype
    Parent.prototype = {
       constructor: Parent,
       func1:  function ()    { ... },
       func2:  function ()    { ... }
    }

    return Parent;
 }());

如何定义一个子对象,该对象也使用继承自parent的模块模式,以便我可以有选择地覆盖,例如func2

2 个答案:

答案 0 :(得分:17)

MINE.child = (function () {

  var Child = function (coords) {
    Parent.call(this, arguments);    
  }

  Child.prototype = Object.create(Parent.prototype);

  Child.prototype.constructor = Child;
  Child.prototype.func2 = function () { ... };

  return Child;

}());

答案 1 :(得分:1)

我发现此博客(http://metaduck.com/08-module-pattern-inheritance.html)的解决方案更清晰。例如:

function Parent(name) {
    // Private variables here
    var myName;

    // Constructor
    myName = name;

    // Public interface
    return {
        func1: function () {alert("Parent func1. Name: " + myName); },
        func2: function () {alert("Parent func2. Name: " + myName); }
    }
}

function Child(name) {
    // Private variables here
    var myName,
        exportObj;

    // Constructor
    // Inherit
    exportObj = Parent(name + "'s father");

    // Override
    exportObj.func2 = function () {
        alert("Child func2. Name: " + name);
    }

    // Export public interface
    return exportObj;
}

可以在此处运行示例:http://jsfiddle.net/wt4wcuLc/

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