# Duration

URL: https://caijiao.org/dayjs/plugin/duration
Source: docs/dayjs/plugin/duration.md
Description: Duration 插件为 Day.js 添加了 '.duration()' 和 '.isDuring()' API，用于处理时间长度。

Duration 增加了 `.duration` `.isDuring` API 来支持时间长度。

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

dayjs.duration(100);
```