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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 

var isoWeeksInYear = require("dayjs/plugin/isoWeeksInYear");
// import isoWeeksInYear from 'dayjs/plugin/isoWeeksInYear' // ES 2015

var isLeapYear = require("dayjs/plugin/isLeapYear"); // dependent on isLeapYear plugin
// import isLeapYear from 'dayjs/plugin/isLeapYear' // ES 2015

dayjs.extend(isoWeeksInYear);
dayjs.extend(isLeapYear);

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