Object 类型扩展
提供了基于 ECMAScript (JavaScript) 的Object 对象的扩展.
命名空间: 无. 本扩展类型是全局型的不属于任意一命名空间。
继承: 无.
语法
var objectVar = new Object();
成员扩展
名称
说明
Object.getType 函数
返回一个指定类型实例.
Object.getTypeName 函数
返回当前运行对象的类型名。
备注
Object 扩展是Microsoft AJAX库的一部分。 它为JavaScript 类库添加了许多功能，并且使之与.net更加亲和。 Object类型扩展提供了更多关于类型的描述与操作方法.
更多关于 JavaScript 类的扩展类型的消息, 请参见 Object Object in the JScript Language Reference.
下面的示例展示了如何使用Object类型扩展，使用getType 扩展函数来创建并引用一个实例。它也用到了getTypeName 扩展函数。
CS
<%@ Page Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"></script><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager runat="server" ID="ScriptManager1"> </asp:ScriptManager> </form></body></html><script type="text/javascript"> Type.registerNamespace('Samples'); // Define and register a Samples.Rectangle class. Samples.Rectangle = function(width, height) { this._width = width; this._height = height; } Samples.Rectangle.prototype.getWidth = function() { return (this._width === undefined) ? null : this._width; } Samples.Rectangle.prototype.getHeight = function() { return (this._width === undefined) ? null : this._height; } Samples.Rectangle.registerClass('Samples.Rectangle'); // Define and register a Samples.Square class. Samples.Square = function(length) { this._length = length; } Samples.Square.prototype.getLength = function() { return (this._length === undefined) ? null : this._length; } Samples.Square.prototype.setLength = function(length) { this._length = length; } Samples.Square.registerClass('Samples.Square'); // Create instances of Square and Rectangle and discover their types. Samples.testObjectReflection = function() { var width = 200; var height = 100; var a = new Samples.Rectangle(width, height); var length = 50; var b = new Samples.Square(length); var name = Object.getTypeName(a); document.write("The type name of object /"a/" is: " + name + "</p>"); var isSquare = Samples.Rectangle.isInstanceOfType(b) document.write("Object /"b/" is an instance of type Square: " + isSquare + "</p>"); var c = Object.getType(b); name = Object.getTypeName(c); document.write("The type name of object /"c/" is: " + name + "</p>"); var isSquare = Samples.Square.isInstanceOfType(c); if (isSquare) { var newLength = a.getWidth(); c.setLength(newLength); document.write("Object /"c/" is a Square with a length of: " + c.getLength() + "</p>"); } } // Run the sample. Samples.testObjectReflection();</script>
VB
<%@ Page Language="VB" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"></script><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <asp:ScriptManager runat="server" ID="ScriptManager1"> </asp:ScriptManager> </form></body></html><script type="text/javascript"> Type.registerNamespace('Samples'); // Define and register a Samples.Rectangle class. Samples.Rectangle = function(width, height) { this._width = width; this._height = height; } Samples.Rectangle.prototype.getWidth = function() { return (this._width === undefined) ? null : this._width; } Samples.Rectangle.prototype.getHeight = function() { return (this._width === undefined) ? null : this._height; } Samples.Rectangle.registerClass('Samples.Rectangle'); // Define and register a Samples.Square class. Samples.Square = function(length) { this._length = length; } Samples.Square.prototype.getLength = function() { return (this._length === undefined) ? null : this._length; } Samples.Square.prototype.setLength = function(length) { this._length = length; } Samples.Square.registerClass('Samples.Square'); // Create instances of Square and Rectangle and discover their types. Samples.testObjectReflection = function() { var width = 200; var height = 100; var a = new Samples.Rectangle(width, height); var length = 50; var b = new Samples.Square(length); var name = Object.getTypeName(a); document.write("The type name of object /"a/" is: " + name + "</p>"); var isSquare = Samples.Rectangle.isInstanceOfType(b) document.write("Object /"b/" is an instance of type Square: " + isSquare + "</p>"); var c = Object.getType(b); name = Object.getTypeName(c); document.write("The type name of object /"c/" is: " + name + "</p>"); var isSquare = Samples.Square.isInstanceOfType(c); if (isSquare) { var newLength = a.getWidth(); c.setLength(newLength); document.write("Object /"c/" is a Square with a length of: " + c.getLength() + "</p>"); } } // Run the sample. Samples.testObjectReflection();</script>
请参见
Object Object new Operator JScript Language Reference
