moment().isoWeekday(Number);
moment().isoWeekday(); // 数字
获取或设置 ISO 星期几，其中 1 是星期一、7 是星期日。
与 moment#day 一样，如果超出范围，则它将会冒泡到其他星期。
moment().isoWeekday(1); // 星期一
moment().isoWeekday(7); // 星期日
还支持星期名称。 这是在 moment 当前的语言环境中解析的。
moment().isoWeekday("Sunday");
moment().isoWeekday("Monday");
moment().isoWeekday(Number);
moment().isoWeekday(); // Number
Gets or sets the ISO day of the week with 1 being Monday and 7 being Sunday.
As with moment#day, if the range is exceeded, it will bubble up to other weeks.
moment().isoWeekday(1); // Monday
moment().isoWeekday(7); // Sunday
A day name is also supported. This is parsed in the moment's current locale.
moment().isoWeekday("Sunday");
moment().isoWeekday("Monday");