ECMAScript 5 (2009) ﺵﻭﺭ ﺯﺍ ﯼﺭﺎﯿﺴﺑﺩﺮﮐ ﻪﻓﺎﺿﺍ ﺖﭙﯾﺮﮑﺳﺍ ﺍﻭﺎﺟ ﻪﺑ ﺍﺭ ﺪﯾﺪﺟ ﯽﺷ ﯼﺎﻫ.
// Create object with an existing object as prototype
Object.create()
// Adding or changing an object property
Object.defineProperty(object, property, descriptor)
// Adding or changing object properties
Object.defineProperties(object, descriptors)
// Accessing Properties
Object.getOwnPropertyDescriptor(object, property)
// Returns all properties as an array
Object.getOwnPropertyNames(object)
// Accessing the prototype
Object.getPrototypeOf(object)
// Returns enumerable properties as an array
Object.keys(object)
// Prevents adding properties to an object
Object.preventExtensions(object)
// Returns true if properties can be added to an object
Object.isExtensible(object)
// Prevents changes of object properties (not values)
Object.seal(object)
// Returns true if object is sealed
Object.isSealed(object)
// Prevents any changes to an object
Object.freeze(object)
// Returns true if object is frozen
Object.isFrozen(object)Object.defineProperty(object, property, {value : value}):ﺪﻫﺩ ﯽﻣ ﺮﯿﯿﻐﺗ ﺍﺭ ﺖﯿﺻﺎﺧ ﺭﺍﺪﻘﻣ ﻝﺎﺜﻣ ﻦﯾﺍ
const person = {
firstName: "John",
lastName : "Doe",
language : "EN"
};
// Change a property
Object.defineProperty(person, "language",
{value : "NO"});→ ﺪﯿﻨﮐ ﻥﺎﺤﺘﻣﺍ ﺍﺭ ﻥﺁ ﻥﺎﺗﺩﻮﺧ
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Object.defineProperty()</h2>
<p>This example changes a property value.</p>
<p id="demo"></p>
<script>
// Create an object:
const person = {
firstName: "John",
lastName: "Doe",
language: "EN"
};
// Change a property
Object.defineProperty(person, "language", {value:"NO"})
document.getElementById("demo").innerHTML = person.language;
</script>
</body>
</html>
ES5 ﺪﯿﻫﺩ ﺮﯿﯿﻐﺗ ﺍﺭ ﺮﯾﺯ ﯽﮔﮋﯾﻭ ﯼﺎﻫ ﻩﺩﺍﺩ ﺎﺘﻣ ﺎﺗ ﺪﻫﺩ ﯽﻣ ﻩﺯﺎﺟﺍ:
writable : true // Property value can be changed
enumerable : true // Property can be enumerated
configurable : true // Property can be reconfigured writable : false // Property value can not be changed
enumerable : false // Property can be not enumerated
configurable : false // Property can be not reconfiguredES5 ﺪﯿﻫﺩ ﺮﯿﯿﻐﺗ ﺍﺭ ﺎﻫ ﻩﺪﻨﻨﮐ ﻢﯿﻈﻨﺗ ﻭ ﺎﻫ ﻩﺪﻧﺮﯿﮔ ﺎﺗ ﺪﻫﺩ ﯽﻣ ﻩﺯﺎﺟﺍ:
// Defining a getter
get: function() { return language }
// Defining a setter
set: function(value) { language = value }:ﺪﻨﮐ ﯽﻣ ﯽﻧﺪﻧﺍﻮﺧ ﻂﻘﻓ ﺍﺭ ﻥﺎﺑﺯ ﻝﺎﺜﻣ ﻦﯾﺍ
Object.defineProperty(person, "language", {writable:false});:ﺪﻨﮐ ﯽﻣ ﺵﺭﺎﻤﺷ ﻞﺑﺎﻗﺮﯿﻏ ﺍﺭ ﻥﺎﺑﺯ ﻝﺎﺜﻣ ﻦﯾﺍ
Object.defineProperty(person, "language", {enumerable:false});:ﺪﻨﮐ ﯽﻣ ﺖﺳﺮﻬﻓ ﺍﺭ ﯽﺷ ﮏﯾ ﺕﺎﯿﺻﻮﺼﺧ ﻡﺎﻤﺗ ﻝﺎﺜﻣ ﻦﯾﺍ
const person = {
firstName: "John",
lastName : "Doe",
language : "EN"
};
Object.defineProperty(person, "language", {enumerable:false});
Object.getOwnPropertyNames(person); // Returns an array of
properties→ ﺪﯿﻨﮐ ﻥﺎﺤﺘﻣﺍ ﺍﺭ ﻥﺁ ﻥﺎﺗﺩﻮﺧ
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Object.getOwnPropertyNames()</h2>
<p>This example list the properties of an object.</p>
<p id="demo"></p>
<script>
// Create an object:
const person = {
firstName: "John",
lastName: "Doe",
language: "EN"
}
// Change Property
Object.defineProperty(person, "language", {enumerable:false});
// Display Properties
document.getElementById("demo").innerHTML = Object.getOwnPropertyNames(person);
</script>
</body>
</html>
:ﺪﻨﮐ ﯽﻣ ﺖﺳﺮﻬﻓ ﺍﺭ ﯽﺷ ﮏﯾ ﺵﺭﺎﻤﺷ ﻞﺑﺎﻗ ﯼﺎﻫ ﯽﮔﮋﯾﻭ ﻂﻘﻓ ﻝﺎﺜﻣ ﻦﯾﺍ
const person = {
firstName: "John",
lastName : "Doe",
language : "EN"
};
Object.defineProperty(person, "language", {enumerable:false});
Object.keys(person); // Returns an array
of enumerable
properties→ ﺪﯿﻨﮐ ﻥﺎﺤﺘﻣﺍ ﺍﺭ ﻥﺁ ﻥﺎﺗﺩﻮﺧ
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Object.keys()</h2>
<p>This example list the enumerable properties of an object.</p>
<p id="demo"></p>
<script>
// Create an object:
const person = {
firstName: "John",
lastName: "Doe",
language: "EN"
}
// Change Property
Object.defineProperty(person, "language", {enumerable:false});
// Display Properties
document.getElementById("demo").innerHTML = Object.keys(person);
</script>
</body>
</html>
:ﺪﻨﮐ ﯽﻣ ﻪﻓﺎﺿﺍ ﯽﺷ ﮏﯾ ﻪﺑ ﺪﯾﺪﺟ ﯽﮔﮋﯾﻭ ﮏﯾ ﻝﺎﺜﻣ ﻦﯾﺍ
// Create an object:
const person = {
firstName: "John",
lastName :
"Doe",
language : "EN"
};
// Add a property
Object.defineProperty(person, "year",
{value:"2008"});→ ﺪﯿﻨﮐ ﻥﺎﺤﺘﻣﺍ ﺍﺭ ﻥﺁ ﻥﺎﺗﺩﻮﺧ
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Object.defineProperty()</h2>
<p>This example adds a new property to an object.</p>
<p id="demo"></p>
<script>
// Create an object:
const person = {
firstName: "John",
lastName: "Doe",
language: "EN"
};
// Add a property
Object.defineProperty(person, "year", {value:"2008"})
document.getElementById("demo").innerHTML = person.year;
</script>
</body>
</html>
ﻭ Getters ﻥﺩﻭﺰﻓﺍ ﯼﺍﺮﺑ ﺪﻧﺍﻮﺗ ﯽﻣ ﻦﯿﻨﭽﻤﻫ Object.defineProperty
//Create an object
const person = {firstName:"John", lastName:"Doe"};
// Define a getter
Object.defineProperty(person, "fullName", {
get:
function () {return this.firstName + " " + this.lastName;}
});→ ﺪﯿﻨﮐ ﻥﺎﺤﺘﻣﺍ ﺍﺭ ﻥﺁ ﻥﺎﺗﺩﻮﺧ
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Object.defineProperty()</h2>
<p>This example uses the defineProperty() method to add a getter and a setter.</p>
<p id="demo"></p>
<script>
// Create an object:
const person = {firstName:"John", lastName:"Doe"};
// Define a getter
Object.defineProperty(person, "fullName", {
get: function () {return this.firstName + " " + this.lastName;}
});
// Display full name
document.getElementById("demo").innerHTML = person.fullName;
</script>
</body>
</html>
// Define object
const obj = {counter:0};
// Define setters
Object.defineProperty(obj, "reset", {
get : function () {this.counter = 0;}
});
Object.defineProperty(obj, "increment", {
get : function () {this.counter++;}
});
Object.defineProperty(obj, "decrement", {
get : function () {this.counter--;}
});
Object.defineProperty(obj, "add", {
set : function (value) {this.counter += value;}
});
Object.defineProperty(obj, "subtract", {
set : function (i) {this.counter -= i;}
});
// Play with the counter:
obj.reset;
obj.add = 5;
obj.subtract = 1;
obj.increment;
obj.decrement;→ ﺪﯿﻨﮐ ﻥﺎﺤﺘﻣﺍ ﺍﺭ ﻥﺁ ﻥﺎﺗﺩﻮﺧ
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Getters and Setters</h2>
<p>Perfect for creating counters:</p>
<p id="demo"></p>
<script>
// Define an object
const obj = {counter:0};
// Define Setters and Getters
Object.defineProperty(obj, "reset", {
get : function () {this.counter = 0;}
});
Object.defineProperty(obj, "increment", {
get : function () {this.counter++;}
});
Object.defineProperty(obj, "decrement", {
get : function () {this.counter--;}
});
Object.defineProperty(obj, "add", {
set : function (value) {this.counter += value;}
});
Object.defineProperty(obj, "subtract", {
set : function (value) {this.counter -= value;}
});
// Play with counter:
obj.reset;
obj.add = 5;
obj.subtract = 1;
obj.increment;
obj.decrement;
document.getElementById("demo").innerHTML = obj.counter;
</script>
</body>
</html>