Ms Ajax Lib-> Object 类型扩展

最新推荐文章于 2025-08-10 21:10:58 发布

翻译最新推荐文章于 2025-08-10 21:10:58 发布 · 1.2k 阅读

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#object #ajax #function #扩展 #server #javascript

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本文介绍了 JavaScript 中 Object 类型的扩展方法，包括 getType 和 getTypeName 函数，这些扩展增强了 JavaScript 的类型描述与操作能力。

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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>