知识大全剖析ASP.NET AJAX的面向对象思想[3]

Posted 2022-07-16 反射

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　　接口

　　接口是类要实现的逻辑协议是对类进行集成的公共遵守的规范它能使多个类和同一个接口把实现定义和类的具体实现结合起来下面的例子定义了一个基类Tree和接口IFruitTree Apple和Banana这两个类实现了接口IFruitTree 但Pine类没有实现接口IFruitTree

Type registerNamespace( Demo Trees );

Demo Trees IFruitTree = function() Demo Trees IFruitTree Prototype = bearFruit: function()Demo Trees IFruitTree registerInterface( Demo Trees IFruitTree );

Demo Trees Tree = function(name) this _name = name;Demo Trees Tree prototype = returnName: function() return this _name;

toStringCustom: function() return this returnName();

makeLeaves: function() Demo Trees Tree registerClass( Demo Trees Tree );

Demo Trees FruitTree = function(name description) Demo Trees FruitTree initializeBase(this [name]); this _description = description;Demo Trees FruitTree prototype bearFruit = function() return this _description;Demo Trees FruitTree registerClass( Demo Trees FruitTree Demo Trees Tree Demo Trees IFruitTree);

Demo Trees Apple = function() Demo Trees Apple initializeBase(this [ Apple red and crunchy ]);Demo Trees Apple prototype = makeLeaves: function() alert( Medium sized and desiduous ); toStringCustom: function() return FruitTree + Demo Trees Apple callBaseMethod(this toStringCustom ); Demo Trees Apple registerClass( Demo Trees Apple Demo Trees FruitTree);

Demo Trees GrannySmith = function() Demo Trees GrannySmith initializeBase(this); // You must set the _description feild after initializeBase // or you will get the base value this _description = green and sour ;Demo Trees GrannySmith prototype toStringCustom = function() return Demo Trees GrannySmith callBaseMethod(this toStringCustom ) + its GrannySmith! ;Demo Trees GrannySmith registerClass( Demo Trees GrannySmith Demo Trees Apple);

Demo Trees Banana = function(description) Demo Trees Banana initializeBase(this [ Banana yellow and squishy ]);Demo Trees Banana prototype makeLeaves = function() alert( Big and green );Demo Trees Banana registerClass( Demo Trees Banana Demo Trees FruitTree);

Demo Trees Pine = function() Demo Trees Pine initializeBase(this [ Pine ]);Demo Trees Pine prototype makeLeaves = function() alert( Needles in clusters );Demo Trees Pine registerClass( Demo Trees Pine Demo Trees Tree);

　　Interface js脚本文件中定义了一个Tree基类和一个IFruitTree接口 Apple和Banana两个继承类实现了IFruitTree接口而Pine类没有实现IFruitTree接口运行Interface aspx 点击对象创建接口检查调用接口方法体验一下

枚举

　　枚举是包含一组被命名的正整数常数的类你可以像访问属性一样访问它的值例如 myObject color = myColorEnum red 枚举提供了一种很容易理解的整数表示下面的例子定义了一个以十六进制数表示的颜色被命名为有意义的名字的枚举类型

Type registerNamespace( Demo );

// Define an enumeration type and register it Demo Color = function();Demo Color prototype = Red: xFF Blue: x FF Green: x FF White: xFFFFFFDemo Color registerEnum( Demo Color );

运行Enumeration aspx 选择下拉框中的颜色脚本程序把背景色设为选中的枚举类型Demo Color中的颜色

　　反射

　　反射用于检查一个运行期程序的结构和组成是通过类Type的API来实现反射的这些方法使你能够收集一个对象的信息例如它是继承于哪个类它是否实现类某个特指的接口它是否是某个类的实例等

　　下面的例子用反射的API测试GrannySmith类是否实现了前面的接口运行Reflection aspx 点击检查类型检查继承检查接口体验一下

　　另外需要说明的一点是 Microsoft AJAX Library是基于开放体系架构而开发的不仅仅用于asp net 还能用于其它体系架构中例如用在java中

cha138/Article/program/net/201311/15065

知识大全 剖析ASP.NET AJAX的面向对象思想[3]

知识大全剖析ASP.NET AJAX的面向对象思想[3]