JavaScript

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�� - JavaScript

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1: JavaScript ��
2: ��
3: ��
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10: ��
11: �� 4

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�� 4

�� 7: �� .

�� . �� . �� , �� . �� "� �� (start):

Name: Status: Name: Status:

�� , �� . �� .

�� , �� . �� . �� :

��.
��.
��.
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�� (pet_name).
�� (form_number) � �� -HTML �� ..

�� :

()play - �� .
()feed � �� .
()medicate � �� .
()makeOlder � �� .
()display � �� .

��, �� "�, �� . �� . �� (�� call �� ):

function Pet(the_pet_name, the_form_number) { this.age = 0; this.hunger = Math.random() * 5; // random number between 0 and 4.99 this.health = Math.random() * 5 + 1 ; // random number between 1 and 3.99 this.happiness = Math.random() * 5; this.pet_name = the_pet_name; this.form_number = the_form_number; window.document.forms[the_form_number].pet_name.value = the_pet_name; }

�� : �� . �� , �� :

var pet1 = new Pet("barney",0); var pet2 = new Pet("betty",1);

�� . �� ()Math.random �� . �� - ()Math.random �� , �� , �� , �� . �� "� �� , �� . �� . �� - [window.document.forms[0 �� [window.document.forms[1 �� .

�� ; �� . �� , �� :

function feed() { var meal_quality = Math.random() * 2; this.hunger = this.hunger - meal_quality; if (this.hunger < 0) { this.hunger = 0; } this.display(); }

�� . �� ()pet1.feed, �� . �� , �� . �� . �� , �� . �� :

function display() { var the_string = ""; if (this.health < min_health) { the_string = this.pet_name + " IS DEAD!"; } else { the_string += "Happiness " + parseInt(this.happiness); the_string += ". Health: " + parseInt(this.health); the_string += ". Hunger: " + parseInt(this.hunger); the_string += ". Age: " + parseInt(this.age); the_string += "."; } window.document.forms[this.form_number].pet_status.value = the_string; }

�� . �� form_number �� . �� , �� form_number (�� ). �� pet1 �� '��', �� pet2 �� '��'. �"� �� - form_number, �� pet1 �� window.forms[0].pet_status.value �� pet2 �� window.document.forms[1].pet_status.value. �� - this.form_number.

�� -parseInt. �� , �� : 2.738993720. �� , �� . �� parseInt �� ; ��, (parseInt(2.738 �� 2.

�� ()makeOlder. �� , �� . �� "� �� -setTimeout, �� . �� - ()makeOlder, �� .

function makeOlder() { var max_hunger = 5; var good_happiness = 5; if (this.health > min_health) { this.age +=1; this.happiness -= Math.random() * 2; this.hunger += Math.random() * 2; if (this.hunger > max_hunger) { this.health -= Math.random() * 2; this.happiness -= Math.random() * 2; } } this.display(); }

�� , �� , �� , �� . �� , �� , �� "�� , �� ".

�� , �� :

function Pet(the_pet_name, the_form_number) { this.age = 0; this.hunger = Math.random() * 5; // random number between 0 and 4.99 this.health = Math.random() * 3 +1 ; // random number between 1 and 3.99 this.happiness = Math.random() * 5; this.pet_name = the_pet_name; this.form_number = the_form_number; this.feed = feed; this.play = play; this.medicate = medicate; this.display = display; this.makeOlder = makeOlder; window.document.forms[the_form_number].pet_name.value = the_pet_name; this.display(); }

�� , �� , �� ()makeOlder �� . �� (start).

function moveTime() { pet1.makeOlder(); pet2.makeOlder(); the_time_out = setTimeout("moveTime();", 3000); }

�� , �� ()moveTime, �� ()makeOlder �� . �� , �� . �� - setTimeout ��. �� - (clearTimeout(the_time_out.

�� . �� , �� JavaScript. �� : �� JavaScript, �� .

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