SOURCE

//条件语句
//用于输入输出处理
function abc(a){
   
       switch (a) {
    case 6:
       day = 0;
        console.log(day);
         
        break;
    case 5:
        day = 1;
         console.log(day);
         break;
    case 4:
        day = 2;
         console.log(day);
         break;
    case 3:
        day = 3;
         console.log(day);
         break;
    case 2:
        day = 4;
         console.log(day);
         break;
    case 1:
        day = 5;
         console.log(day);
         break;
    case 0:
        day = 6;
         console.log(day);
} 

}
abc(4)