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Atlas学习手记(29):JavaScript面向对象的扩展(三):接口Int

添加时间:2013-12-6
    相关阅读: ASP 页面 JavaScript 网站

 本文示例源代码或素材下载

  主要内容

  1.概述

  2.完整示例

  一.概述

  在Javascript中并没有空间、类、接口这些概念,Atlas对这些东西进行了封装,增强了JavaScript面向对象方面的能力,本文看一下如何使用接口,使用如下的方法:

  registerInterface:注册一个接口

  registerAbstractClass:注册抽象的基类

  使用abstractMethod指定接口中的方法

  二.完整示例

  看一下Atlas官方网站提供的例子,新建Atlas Web Site,添加一个Inheritance.js的JS文件,其中定义了一个Animal基类和IPet接口,Dog和Cat分别去实现接口,而Tiger类没有实现:

// JScript File
Type.registerNamespace("Demo.Animals");
Demo.Animals.IPet = function() {
  this.returnFriendlyName = Function.abstractMethod;
}
Demo.Animals.IPet.registerInterface('Demo.Animals.IPet');
Demo.Animals.Animal = function(name) {
  var _name = name;
  this.returnName = function() {
    return _name;
  }
}
Demo.Animals.Animal.registerAbstractClass('Demo.Animals.Animal');
Demo.Animals.Animal.prototype.toStringCustom = function() {
  return this.returnName();
}
Demo.Animals.Animal.prototype.speak = Function.abstractMethod;
Demo.Animals.Pet = function(name, friendlyName) {
  Demo.Animals.Pet.initializeBase(this, [name]);
  var _friendlyName = friendlyName;
  this.returnFriendlyName = function() {
    return _friendlyName;
  }
}
Demo.Animals.Pet.registerAbstractClass('Demo.Animals.Pet', Demo.Animals.Animal, Demo.Animals.IPet);
Demo.Animals.Cat = function(friendlyName) {
  Demo.Animals.Cat.initializeBase(this, ['Cat', friendlyName]);
}
Demo.Animals.Cat.registerClass('Demo.Animals.Cat', Demo.Animals.Pet);
Demo.Animals.Cat.prototype.speak = function() {
  alert('meow');
}
Demo.Animals.Cat.prototype.toStringCustom = function() {
  return 'Pet ' + Demo.Animals.Cat.callBaseMethod(this, 'toStringCustom');
}
Demo.Animals.Felix = function() {
  Demo.Animals.Felix.initializeBase(this, ['Felix']);
}
Demo.Animals.Felix.registerClass('Demo.Animals.Felix', Demo.Animals.Cat);
Demo.Animals.Felix.prototype.toStringCustom = function() {
  return Demo.Animals.Felix.callBaseMethod(this, 'toStringCustom') + ' its Felix!';
}
Demo.Animals.Dog = function(friendlyName) {
  Demo.Animals.Dog.initializeBase(this, ['Dog', friendlyName]);
}
Demo.Animals.Dog.registerClass('Demo.Animals.Dog', Demo.Animals.Pet);
Demo.Animals.Dog.prototype.speak = function() {
  alert('woof');
}
Demo.Animals.Tiger = function() {
  Demo.Animals.Tiger.initializeBase(this, ['Tiger']);
}
Demo.Animals.Tiger.registerClass('Demo.Animals.Tiger', Demo.Animals.Animal);
Demo.Animals.Tiger.prototype.speak = function() {
  alert('grrr');
}

在ASPX页面中引入该JS文件:

<script type="text/javascript" src="Interface.js"></script>

  编写脚本,做一些简单的测试:

<script type="text/javascript" language="JavaScript">
  function OnTestNewClick() {
    var cat = new Demo.Animals.Cat('Kitty');
    alert(cat.returnName());
    cat.speak();
    return false;
  }
  function OnTestImplementsClick() {
    var cat = new Demo.Animals.Cat('Kitty');
    if (Demo.Animals.IPet.isImplementedBy(cat)) {
      alert('Cat implements IPet');
    }
    else {
      alert('Cat does not implement IPet');
    }
    var tiger = new Demo.Animals.Tiger();
    if (Demo.Animals.IPet.isImplementedBy(tiger)) {
      alert('Tiger implements IPet');
    }
    else {
      alert('Tiger does not implement IPet');
    }
    return false;
  }
  function OnTestInterfaceMethodClick() {
    var cat = new Demo.Animals.Cat('Kitty');
    ProcessAnimal(cat);
    var tiger = new Demo.Animals.Tiger();
    ProcessAnimal(tiger);
    var dog = new Demo.Animals.Dog('Joe');
    ProcessAnimal(dog);
    var g = new Demo.Animals.Felix();
    ProcessAnimal(g);
    return false;
  }
  function ProcessAnimal(animal) {
    alert('Current animal ' + animal.returnName());
    alert(animal.toStringCustom());
    if (Demo.Animals.IPet.isImplementedBy(animal)) {
      alert(animal.returnName() + ' implements IPet; friendlyName: ' + animal.returnFriendlyName());
    }
    if (Demo.Animals.Felix.isInstanceOfType(animal)) {
      alert('No ordinary cat its Felix!');
    }
  }
</script>


  关于接口的介绍就到这里了

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