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我的总体目标是让指定的动物（cat1）发出声音（警报框）并让另一只特定的动物（dog1）听猫发出声音并用它的声音回复。

在下面的代码中，我尝试使用 bind 命令来实现我的回调。

Ext.define('Animal', 
    {
        name: 'Unknown',
        sound: 'Unknown',
        listening: this.listening,
        constructor: function(name) 
        {
            if (name)
            {
                this.name = name;
            }
        },
        makeSound: function() 
        {
            alert(this.name + " says " + this.sound);
            if(this.listening)
            {
                this.listening();
            }
        },
        isListening: function(listening)
        {
            this.listening = listening;
        }
    });

Ext.define('Cats',
    {
        extend: 'Animal',
        name: 'Unknown',
        sound: 'Meow',
        listening: this.listening,
        listen: function()
        {
            if(this.listening)
                alert(this.name + "is listening.");
        }
    });
Ext.define('Dogs',
    {
        extend: 'Animal',
        name: 'Unknown',
        sound: 'Woof',
        listening: this.listening,
        listen: function()
        {
            if(this.listening)
                alert(this.name + "is listening.");
        }
    });
var cat1 = Ext.create('Cats', 'Domino');
var cat2 = Ext.create('Cats', 'Tiger');
var dog1 = Ext.create('Dogs', 'Bruno');
var dog2 = Ext.create('Dogs', 'Spot');

dog1.listen = dog1.listen.bind(dog1); //failed miserably, not sure of the proper usage,
cat1.isListening(dog1.listen);        //I saw an example using this format.
cat1.makeSound();
cat2.makeSound();
dog1.makeSound();
dog2.makeSound();

这当然对我不起作用，但它可能就像绑定命令的错误使用一样简单（控制台中没有错误有时很难说）我真正想要完成的方法如下：（评论在下面的代码中解释得很好）

Ext.define('Animal', 
    {
        name: 'Unknown',
        sound: 'Unknown',
        listening: this.listening,
        constructor: function(name) 
        {
            if (name)
            {
                this.name = name;
            }
        },
        makeSound: function() 
        {
            alert(this.name + " says " + this.sound);
        },
        listen: function(obj)
        {
            if(this.listening)
                alert(obj.name + " is listening to " + this.name + ".");
        }
    });

Ext.define('Cats',
    {
        extend: 'Animal',
        name: 'Unknown',
        sound: 'Meow',
    });
Ext.define('Dogs',
    {
        extend: 'Animal',
        name: 'Unknown',
        sound: 'Woof',
    });
var cat1 = Ext.create('Cats', 'Domino');
var cat2 = Ext.create('Cats', 'Tiger');
var dog1 = Ext.create('Dogs', 'Bruno');
var dog2 = Ext.create('Dogs', 'Spot');

//some callback that will wait for a specific animal to make a sound
//and call the listen function in an intelligent way so I get this.name
//to be the animal that made that sound and the obj.name to be the 
//animal that is listening

cat1.makeSound();
cat2.makeSound();
dog1.makeSound();
dog2.makeSound();

这需要我使用正确的范围，当然我不知道如何处理。主要是我希望在这方面得到一些帮助，同时远离回调的自定义事件。任何帮助表示赞赏。

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1 回答 1

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不要试图重新发明轮子，而是使用事件。Ext.util.Observable 为您完成了所有这些工作。

于 2013-07-10T23:03:47.787 回答