面向对象的JavaScript

作者：佚名来源：互联网整理日期：2008-06-18

JavaScript 是一种解释型的、基于对象的脚本语言。尽管与 C++、C# 这样成熟的面向对象的语言相比，JavaScript的功能要弱一些，但对于它的预期用途而言，JavaScript的功能已经足够大了。但是由于各种各样的原因，我们在实际进行开发的过程中往往忽略了他基于对象的这一特性，以至JavaScript编写的程序显的杂乱无章。这样不仅不易于观看，更不易于修改。今天就让我们来看看JavaScript基于对象的这一特性。

类：

function DelegateObject(){

var obj = new Object();

obj.value = "";

obj.FormatString = null;

obj.toString = function _toString(){

if(obj.FormatString != null)

return this.FormatString(this.Value);

else

return this.Value;

}

return obj;

}

var obj = new DelegateObject();

委托：

function DelegateObject(){

var obj = new Object();

obj.value = "";

obj.FormatString = null;

obj.toString = function _toString(){

if(obj.FormatString != null)

return this.FormatString(this.Value);

else

return this.Value;

}

return obj;

}

function ConvertToString(value){

return "Result:" + value;

}

var obj = new DelegateObject();

obj.Value = "Hello World!";

obj.FormatString = ConvertToString;

document.write(obj.toString());

重写：

function DelegateObject(){

var obj = new Object();

obj.toString = function _toString(){

if(obj.FormatString != null)

return this.FormatString(this.Value);

else

return this.Value;

}

return obj;

}

继承：

function DelegateObject(){

var obj = new Object();

obj.value = "";

obj.FormatString = null;

obj.toString = function _toString(){

if(obj.FormatString != null)

return this.FormatString(this.Value);

else

return this.Value;

}

return obj;

}

function Class2(){

var obj = new DelegateObject();

return obj;

}

function ConvertTOString(value){

return "Result:" + value;

}

var obj = new Class2();

obj.Value = "Hello World!";

obj.FormatString = ConvertTOString;

document.write(obj.toString());

事件：

function EventHandler(){

var eventobj = new Object();

eventobj._eventHandler = null;

eventobj.Activate = function _activate(){

if(eventobj._eventHandler != null)

eventobj._eventHandler();

}

eventobj.Add = function _add(eventHandler){

eventobj._eventHandler = EventHandler;

}

eventobj.Remove = function _remove(){

eventobj._eventHandler = null;

}

return eventobj;

}

function mouseClick(){

alert("Hello World!");

}

var obj = new EventHandler();

obj.Add(mouseClick());

obj.Activate();

枚举：

function _StatusList(){

var object = new Object();

object.正常= "Normal";

object.删除= "Delete";

object.审核通过= "Auditing";

object.驳回 = "OverRule";

return object;

}

Object.prototype.StatusList = new _StatusList();

function TObject(){

var obj = new Object();

obj.Type = "YiZhu";

obj.Status = Object.StatusList.审核通过;

}

alert(obj.Status);