[AS3]as3利用函数返回函数源代码示例

[AS3]as3利用函数返回函数源代码示例

package {  
    import flash.display.Sprite;  
    public class Sample9261 extends Sprite  
    {     
        public function Sample9261()  
        {  
            //通过A调用只有一个参数的aFunc():  
            chooseFuncBy("A")("A func has only one parameter.");  
            //输出：aFunc():A func has only one parameter.  
              
            //通过B调用有两个参数的bFunc():  
            chooseFuncBy("B")("B func has two parameters.","No.2 parameter");  
            //输出:bFunc():B func has two parameters. one more Parameter:No.2 parameter  
              
            //字符串不符,默认函数  
         chooseFuncBy("wu lala")("I choose A function");  
            //输出：Welcome to kingda.org! My blog  
              
            var withObj:Object = new Object();  
            var myObj:Object = {name:"黑羽",blog:"http://www.kingda.org",hobby:"WowCraft"};  
            chooseFuncBy(withObj)(myObj);  
            /*输出：  
        objectFunc():  
            name:黑羽  
        blog:http://www.kingda.org  
            hobby:WowCraft  
            */  
        }  
          
        public function chooseFuncBy(input:*):Function  
        {  
            //运用一：利用参数的种类来确定返回的函数  
         if(!(input  is  String))  
            {  
                return objectFunc;  
            }  
              
             //运用二：根据参数内容来返回函数  
         switch(input)  
            {  
                case "A":  
                return aFunc;  
                case "B":  
                return bFunc;  
                default:  
                return kingdaFunc;  
            }  
              
           //更多延伸运用：利用参数个数、 is 确定不同Class的实例来选择函数，等等  
        }  
        public function aFunc(str:String):void  
        {  
            trace("aFunc():"+str);  
        }  
          
        public function bFunc(str1:String,str2:String):void  
        {  
            trace("bFunc():"+str1+" one more Parameter:"+str2);  
        }  
          
        public function kingdaFunc(...rest):void  
        {  
            trace("Welcome to Kingda.org! My blog");  
        }  
          
        public function objectFunc(kingdaObj:Object):void  
        {  
            trace("objectFunc():");  
            for(var i:String  in  kingdaObj)  
            {  
                trace(i+":"+kingdaObj[i]);  
            }  
        }  
    }  
}