Javascript switch語句

<script>
    var d = 7; //變量
    switch(d){ //對哪個變量進行switch操作
        case 1: //冒號，後無大括號
            console.log('Monday');
            break;
        case 2:
            console.log('Tuesday');
            break;
        case 3:
            console.log('Wednesday');
            break;
        case 4:
            console.log('Thursday');
            break;
        case 5:
            console.log('Friday');
            break;
        case 6: //後無內容無break，則直接跳下步
        case 7:
        default : //默認
            console.log("Enjoy weenkend !");
            break;
    }
</script>