NOTE: javascript prototype chain

最新推荐文章于 2023-08-20 08:42:01 发布

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#prototype #javascript #reference #object #function #dojo

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本文深入探讨了JavaScript中原型链的工作原理及其如何实现继承。通过一个简单的示例展示了对象如何从其原型继承属性，并且演示了当修改对象及其原型上的属性时会发生什么。

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=== copy from mastering dojo ===

What Is a Prototype?
Every object in JavaScript contains a reference to another
object termed its prototype. Since the prototype is another
object itself, it also contains a reference to its prototype. This
forms a chain of objects. The chain terminates with the prototype
for the built-in Object type.
When a property of an object is read, JavaScript looks for the
property in the object. If not found, JavaScript then looks in the
prototype object, the prototype of the prototype, and so on,
up the prototype chain until the property is found or the chain
is exhausted. Since a method is just a property that happens to
be a function, this is how method dispatching occurs, and this
system is called prototypal inheritance.

=== test ===

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>test prototype</title> <body> <div id="debug"></div> <mce:script type="text/javascript"></mce:script> </body> </html>