用switch语句判断月份，打印出当前月份所在的季节

   var today=new Date();
    var abc=today.getMonth();
    switch (abc) {
        case 0:
        case 1:
        case 2:
            document.write("现在是春季");
            break;
        case 3:
        case 4:
        case 5:
            document.write("现在是夏季");
            break;
        case 6:
        case 7:
        case 8:
            document.write("现在是秋季");
            break;
        case 9:
        case 10:
        case 11:
            document.write("现在是冬季");
            break;
    }