JavaScript 事件對象的實現

比如，我們定義了一個Classroom對象，這裡我們定一個事件，當教室裡的人增加超60人時就觸發一個事件onFull;具體定義如下： 複製代碼 代碼如下: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("教室裡有"+number+"人");
}
function show2(number)
{
alert("教室裡超出了"+(number-60)+"人");
}
var classroom1=new Classroom();
classroom1.onFull=show1;
classroom1.peopleEnter(30);
classroom1.peopleEnter(32);
classroom1.onFull=show2;
classroom1.peopleEnter(34);