# weekOfYear

URL: https://caijiao.org/dayjs/plugin/week-of-year
Source: docs/dayjs/plugin/week-of-year.md
Description: WeekOfYear 增加了 .week() API 返回一个 number 来表示 Day.js 的日期是年中第几周。

WeekOfYear 增加了 `.week()` API 返回一个 `number` 来表示 Day.js 的日期是年中第几周。

```javascript
var weekOfYear = require("dayjs/plugin/weekOfYear");
dayjs.extend(weekOfYear);

dayjs("2018-06-27").week(); // 26
dayjs("2018-06-27").week(5); // 设置周
```