IsoWeeksInYear

IsoWeeksInYear 增加了 .isoWeeksInYear() API 返回一个 number 来得到依据 ISO week 标准一年中有几周

这依赖 IsLeapYear 插件，才能正常运行

javascript

var isoWeeksInYear = require("dayjs/plugin/isoWeeksInYear");
var isLeapYear = require("dayjs/plugin/isLeapYear"); // dependent on isLeapYear plugin
dayjs.extend(isoWeeksInYear);
dayjs.extend(isLeapYear);

dayjs("2004-01-01").isoWeeksInYear(); // 53
dayjs("2005-01-01").isoWeeksInYear(); // 52

IsoWeeksInYear ​

IsoWeeksInYear