【typescript】TS有静态方法的枚举

用 enum + namespace 的声明方式可以为枚举添加静态方法，示例如下：

enum WeekDay {
    Monday,//不写值，则值默认为从0开始的数字
    Tuseday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
}

namespace WeekDay {
    export function isBusinessDay(day:WeekDay) {
        switch(day) {
            case WeekDay.Saturday:
            case WeekDay.Sunday:
                return false;
            default:
                return true
        }
    }
}

const mon = WeekDay.Monday;
const sat = WeekDay.Saturday;
const thu = 3

console.log(WeekDay.isBusinessDay(mon));
// true
console.log(WeekDay.isBusinessDay(sat));
// false
console.log(WeekDay.isBusinessDay(thu));
//true

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