Flex中swtich case的用法

<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" minWidth="955" minHeight="600" 
                creationComplete="switchCase1('cyrq'),switchCase2('cyrq')"> 
    <mx:Script> 
        <![CDATA[ 
             
            //正确的用法  
            private function switchCase1(string:String):void 
            { 
                switch (string) 
                { 
                    case "cyrq": 
                    case "ryrq": 
                        trace("switchCase1=="+string); //正常打印 
                        break; 
                    default: 
                        break; 
                } 
            } 
            //错误的用法（可恶的是，用或者符号|| 页面中也没有语法错误提示 ） 
            private function switchCase2(string:String):void 
            { 
                switch (string) 
                { 
                    case "ryrq" || "cyrq": 
                        trace("switchCase2=="+string); //不能打印 
                        break; 
                    default: 
                        break; 
                } 
            } 
        ]]> 
    </mx:Script> 
</mx:Application>