# .focus()
# .focus()
Categories: [Method Overrides](http://www.css88.com/jquery-ui-api/category/overrides/ "View all posts in Method Overrides") | [Methods](http://www.css88.com/jquery-ui-api/category/methods/ "View all posts in Methods") | [UI Core](http://www.css88.com/jquery-ui-api/category/ui-core/ "View all posts in UI Core")
## .focus( delay \[, callback \] )Returns: [jQuery](http://api.jquery.com/Types/#jQuery)
**Description:** 異步聚焦到一個元素。
- #### [.focus( delay \[, callback \] )](#focus-delay-callback)
- **delay**Type: [Integer](http://api.jquery.com/Types/#Integer)聚焦前等待的毫秒數。
- **callback**Type: [Function](http://api.jquery.com/Types/#Function)()元素被聚焦后要調用的函數。
該插件擴展自 jQuery 內置的 [`.focus()`](api.jquery.com/focus) 方法。如果 jQuery UI 未加載，調用 `.focus()` 方法不會直接失敗，因為該方法在 jQuery 中存在。但是不會發生預期的行為。
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