js 写21点

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var count = 0;

function cc(card) {
// Only change code below this line
switch(card){
case 2:
case 3:
case 4:
case 5:
case 6:
count++;
break;
case 10:
case "J":
case "Q":
case "K":
case "A":
count--;
break;

default:break;

}
if(count >0){
return count + " Bet";
}else if (count<=0){
return count + " Hold";
}

}

cc(2); cc(3); cc(7); cc('K'); cc('A');