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[示例]JavaScript物件導向(面向對象)
一派護法 十九級
1樓 發表于:2015-7-17 22:02
HTML頁面:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Object-Oriented JavaScript</title>
<script src="Person.js"></script>
<script src="Student.js"></script>
<script>
function main() {
    Person.showCount();
    var person1 = new Person("Alice", "Green");
    person1.age = 45;
    person1.sayHello();
    person1.walk();
    Person.showCount();
   
    var person2 = new Person("Bob", "Green");
    person2.age = 32;
    person2.sayHello();
    person2.walk();
    Person.showCount();
   
    var student1 = new Student("Janet", "Green", "Applied Physics");
    student1.age = 17;
    student1.sayHello();
    student1.walk();
    student1.sayGoodBye();
    Person.showCount();
}
</script>
</head>

<body onload="main()">
</body>
</html>
一派護法 十九級
2樓 發表于:2015-7-17 22:02
Person.js:
/* Constructor */
/* 構造函數 */
function Person(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
    Person.count++;
}

/* Properties */
/* 屬性 */
Person.prototype.firstName = "";
Person.prototype.lastName = "";
Person.prototype.age = 0;

/* Methods */
/* 方法 */
Person.prototype.getFullName = function() {
    var fullName = this.firstName;
    if (this.lastName != "") {
        fullName += " " + this.lastName;
    }
    return fullName;
}

Person.prototype.sayHello = function() {
    var ageStr = this.age + " year";
    if (this.age > 1) {
        ageStr += "s";
    }
    console.log("Hello, I'm " + this.getFullName() + ".\nI'm " + ageStr + " old now.");
}

Person.prototype.walk = function() {
    console.log(this.getFullName() + " is walking!");
}

/* Static Properties */
/* 靜態屬性 */
Person.count = 0;

/* Static Methods */
/* 靜態方法 */
Person.showCount = function() {
    if (this.count == 1) {
        console.log("There is 1 person.");
    } else if (this.count == 0) {
        console.log("There are no people.");
    } else {
        console.log("There are " + this.count + " people now.");
    }
}
一派護法 十九級
3樓 發表于:2015-7-17 22:02
Student.js:
function Student(firstName, lastName, subject) {
    Person.call(this, firstName, lastName); // call the parent constructor
    this.subject = subject;
}

Student.prototype = Object.create(Person.prototype);
Student.prototype.constructor = Student;

/* Properties */
Student.prototype.subject = "";

/* Methods */
Student.prototype.sayHello = function() {
    Person.prototype.sayHello.call(this); // call the parent sayHello()
    console.log("I'm studying " + this.subject + ".");
}

Student.prototype.sayGoodBye = function() {
    console.log("Goodbye!");
}
一派護法 十九級
4樓 發表于:2015-7-17 22:08
類的結構相當於:
<?php
abstract class Person {
    public static $count;
    public $firstName;
    public $lastName;
    public $age;
   
    abstract public static function showCount();
    abstract public function getFullName();
    abstract public function sayHello();
    abstract public function walk();
}

abstract class Student extends Person {
    public $subject;
    public function sayHello() { // Override
    }
    abstract public function sayGoodBye();
}
?>
(以上所有的abstract都是我加上的,否則這個PHP文件就是錯誤的)
一派護法 十九級
5樓 發表于:2015-7-17 22:10
輸出內容:
There are no people.
Person.js (line 47)

Hello, I'm Alice Green.
I'm 45 years old now.

Person.js (line 30)
Alice Green is walking!
Person.js (line 34)
There is 1 person.
Person.js (line 45)

Hello, I'm Bob Green.
I'm 32 years old now.

Person.js (line 30)
Bob Green is walking!
Person.js (line 34)
There are 2 people now.
Person.js (line 49)

Hello, I'm Janet Green.
I'm 17 years old now.

Person.js (line 30)
I'm studying Applied Physics.
Student.js (line 15)
Janet Green is walking!
Person.js (line 34)
Goodbye!
Student.js (line 19)
There are 3 people now.
Person.js (line 49)

一派護法 十九級
6樓 發表于:2015-7-17 22:13
本文參考資料:
Introduction to Object-Oriented JavaScript - JavaScript | MDN
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript

oop - How do I create an abstract base class in JavaScript? - Stack Overflow
http://stackoverflow.com/questions/597769/how-do-i-create-an-abstract-base-class-in-javascript

Extending JavaScript Objects and Classes
http://phrogz.net/JS/classes/ExtendingJavaScriptObjectsAndClasses.html

Inheritance and the prototype chain - JavaScript | MDN
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain

function - Javascript object extending - - Stack Overflow
http://stackoverflow.com/questions/10430279/javascript-object-extending

JavaScript 2 and the Future of the Web
https://developer.mozilla.org/presentations/xtech2006/javascript/
一派護法 十九級
7樓 發表于:2015-7-17 22:17
Private Members in JavaScript
http://javascript.crockford.com/private.html

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作者:巨大八爪鱼
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