Implementation _javascript techniques for JavaScript event objects

For example, we define a classroom object, where we set an event that triggers an event onfull when the classroom person increases by more than 60 people:

Copy Code code as follows:

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 ("+number+" in the classroom);
}
function Show2 (number)
{
Alert ("Classroom Beyond" + (number-60) + "person");
}
var classroom1=new classroom ();
Classroom1.onfull=show1;
Classroom1.peopleenter (30);
Classroom1.peopleenter (32);
Classroom1.onfull=show2;
Classroom1.peopleenter (34);