switch语句

switch(){
   case :
      break;
   case :
      break;
}
   var qujing = ["孙悟空","猪八戒","沙悟净","白龙马"];
        var aa = "孙悟空";
              switch(aa){
   case qujing[0]:
      alert("我就是齐天大圣孙悟空");
      break;
   case qujing[1]:
      alert("问世间情为何物，只叫人生死相许");
      break;
}