WeekYear
WeekYear 插件添加了 .weekYear() API，用于获取本地化的 ISO 周年份。
javascript
var weekYear = require('dayjs/plugin/weekYear'); // 依赖 weekOfYear 插件
// import weekYear from 'dayjs/plugin/weekYear' // ES 2015
var weekOfYear = require('dayjs/plugin/weekOfYear');
// import weekOfYear from 'dayjs/plugin/weekOfYear' // ES 2015
dayjs.extend(weekOfYear);
dayjs.extend(weekYear);
dayjs().weekYear();