ActionScript 3 Tips and Tricks(2)

 
[1b]Class scope is now bound to class methods[/1b]
[1b]类作用域现在和类方法绑定在一起了[/1b]
ActionScript 3 is entirely class-based.
ActionScript 3 是一个完全基于类的语言。
When you create classes, you create variables and functions (methods) which relate to and work with that class and instances of that class.
 当你创建类的时候，你除了创建这个类的实例外，同时也创建了和这个类相关的变量和方法。
Unlike ActionScript 2, methods in ActionScript 3 now retain their class scope when called, even if assigned to another object and called from that object, or if used with Function.call and Function.apply.
和ActionScript 2不同，在ActionScript 3中的类中的方法的作用域仍然保留在这个类里面，而不管是不是其他的类调用这个方法。可能有点难以明白，看代码吧(即使看了代码也不明白的)
大概就是想说保持this的指向吧
Example:
代码:
package {
    import flash.display.Sprite;
   
    public [1b]class[/1b] ClassScope extends Sprite {
       
        public [1b]function[/1b] ClassScope() {     
            traceThis(); //输出: "Class Instance"
           
            [1b]var[/1b] obj:Object = [1b]new[/1b] Object();
            obj.traceThis = traceThis;
            obj.traceThis(); //
本文转自：http://www.5uflash.com/flashjiaocheng/Flash-as3-jiaocheng/1808.html