JavaScript對象事件的實現(xiàn)

前我寫過一篇關(guān)于JavaScript如何實現(xiàn)面向?qū)ο缶幊痰奈恼隆?/span>

今天，我寫這篇文章跟大家討論一下，如何實現(xiàn)事件。

比如，我們定義了一個Classroom對象，這里我們定一個事件，當(dāng)教室里的人增加超60人時就觸發(fā)一個事件onFull;具體定義如下：

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