Flex 命名空间
通过命名空间可以控制所创建的属性和方法的可见性。请将 public、private、protected和 internal 访问控制说明符视为内置的命名空间。如果这些预定义的访问控制说明符无法满足您的要求，您可以创建自己的命名空间。如果您熟悉 XML 命名空间，那么，您对这里讨论的大部分内容不会感到陌生，但是ActionScript 实现的语法和细节与 XML 的稍有不同。即使您以前从未使用过命名空间，也没有关系，因为命名空间概念本身很简单，但是其实现涉及一些您需要了解的特定术语。要了解命名空间的工作方式，有必要先了解属性或方法的名称总是包含两部分：标识符和命名空间。标识符通常被视为名称。例如，以下类定义中的标识符是 sampleGreeting 和sampleFunction()：
class SampleCode
{
var sampleGreeting:String;
function sampleFunction () {
trace(sampleGreeting + " from sampleFunction()");
}
}
只要定义不以命名空间属性开头，就会用默认 internal 命名空间限定其名称，这意味着，它们仅对同一个包中的调用方可见。如果编译器设置为严格模式，则编译器会发出一个警告，指明 internal 命名空间将应用于没有命名空间属性的任何标识符。为了确保标识符可在任何位置使用，您必须在标识符名称的前面明确加上 public 属性。在上面的示例代码中，sampleGreeting 和 sampleFunction() 都有一个命名空间值 internal。使用命名空间时，应遵循以下三个基本步骤。
第一，必须使用 namespace 关键字来定义命名空间。例如，下面的代码定义 version1 命名空间：
namespace version1;
第二，在属性或方法声明中，使用命名空间（而非访问控制说明符）来应用命名空间。下面的示例将一个名为 myFunction() 的函数放在 version1 命名空间中：
version1 function myFunction() {}
第三，在应用了该命名空间后，可以使用 use 指令引用它，也可以使用该命名空间来限定标识符的名称。下面的示例通过 use 指令来引用 myFunction() 函数：
use namespace version1;
myFunction();
您还可以使用限定名称来引用 myFunction() 函数，如下面的示例所示：
version1::myFunction();
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