JavaScript对象事件的实现

前我写过一篇关于JavaScript如何实现面向对象编程的文章。

今天，我写这篇文章跟大家讨论一下，如何实现事件。

比如，我们定义了一个Classroom对象，这里我们定一个事件，当教室里的人增加超60人时就触发一个事件onFull;具体定义如下：

var Classroom=function()

        {

            this.numberOfPeople=0;

            this.onFull=null;

            this.peopleEnter=function(number)

            {

                this.numberOfPeople+=number;

                if(this.numberOfPeople>60&&this.onFull!=null)

                {

                this.onFull(this.numberOfPeople);

                }

            }

       }

        function show1(number)

        {

            alert("教室里有"+number+"人");

        }

        function show2(number)

        {

            alert("教室里超出了"+(number-60)+"人");

        }

        var classroom1=new Classroom();

        classroom1.onFull=show1;

        classroom1.peopleEnter(30);

        classroom1.peopleEnter(32);

        classroom1.onFull=show2;

        classroom1.peopleEnter(34);

• javascript