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JavaScript Tutorial/Object Oriented/Object - История изменений
2026-04-29T22:32:28Z
История изменений этой страницы в вики
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Admin: 1 версия
2010-05-26T08:24:20Z
<p>1 версия</p>
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<td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 08:24, 26 мая 2010</td>
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Admin
http://wbex.ru/index.php?title=JavaScript_Tutorial/Object_Oriented/Object&diff=8478&oldid=prev
в 18:52, 25 мая 2010
2010-05-25T18:52:56Z
<p></p>
<p><b>Новая страница</b></p><div>== Add method to Object class==<br />
<br />
<p>Since all objects used in JavaScript are inherited from Object, all of the object can use the method added to Object.</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
Object.prototype.showValue = function () {<br />
alert(this.valueOf());<br />
};<br />
var str = "hello";<br />
var iNum = 25;<br />
str.showValue();<br />
iNum.showValue();</source><br />
<br />
<br />
<br />
== Object()==<br />
<br />
<p>Syntax</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
var variable = new Object(string)</source><br />
<br />
<br />
<p>The Object() object is a primitive data type from which all JavaScript objects are derived.</p><br />
Properties of the Object() Object<br />
Property<br />
Description<br />
constructor<br />
Function that creates an object<br />
eval()<br />
Evaluates a string of JavaScript code for the specified object<br />
prototype<br />
Prototypes new properties for the specific object<br />
toSource()<br />
Returns a string representation for the object<br />
toString()<br />
Converts the object to its string representation<br />
unwatch<br />
Removes a watchpoint for the object<br />
valueOf<br />
Returns the value of the specific object<br />
watch<br />
Adds a watchpoint to the object property<br />
<br />
== Object.eval()==<br />
<br />
<p>Syntax</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
object.eval(string)</source><br />
<br />
<br />
<br />
== Object.prototype==<br />
<br />
<p>Syntax</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
object.prototype.property<br />
object.prototype.method</source><br />
<br />
<br />
<br />
== Object.toSource()==<br />
<br />
<p>Syntax</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
object.toSource()</source><br />
<br />
<br />
<br />
== Object.toString()==<br />
<br />
<p>The toString() method gets a string representation of the Number object.</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<body><br />
<script language="JavaScript"><br />
<!--<br />
var aNum = Number(21);<br />
document.write(aNum.toString());<br />
--><br />
</script><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Object.unwatch()==<br />
<br />
<p>Syntax</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
object.unwatch(prop)</source><br />
<br />
<br />
<br />
== Object.valueOf()==<br />
<br />
<p>The valueOf() method obtains the value of the specified object.</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
<html><br />
<body><br />
<script language="JavaScript"><br />
<!--<br />
var age = Number(30);<br />
document.write(age.valueOf());<br />
--><br />
</script><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Object.watch()==<br />
<br />
<p>Syntax</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
object.watch(prop, function)</source><br />
<br />
<br />
<br />
== The Object Class==<br />
<br />
<p>The Object class in JavaScript is similar to java.lang.Object in Java.</p><br />
<p>The Object class in JavaScript is the base class for all JavaScript classes.</p><br />
<p>All the properties and methods of the Object class are also present in the other classes.</p><br />
<p>The Object class has the following properties:</p><br />
<OL><LI>constructor -- For the Object class, this points to the native Object() function.</LI><LI>prototype -- For the all classes, this returns an instance of Object by default.</LI></OL><br />
<p>The Object class also has several methods:</p><br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="javascript"><br />
object.hasOwnProperty(property)</source></div>