FocusEvent.relatedTarget

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FocusEvent.relatedTarget read-only property is the secondary target, depending on the type of event:

Event name	`target`	`relatedTarget`
`blur`	`EventTarget` losing focus	`EventTarget` receiving focus (if any).
`focus`	`EventTarget` receiving focus	`EventTarget` losing focus (if any)
`focusin`	`EventTarget` receiving focus	`EventTarget` losing focus (if any)
`focusout`	`EventTarget` losing focus	`EventTarget` receiving focus (if any)

注意， many elements can't have focus , which is a common reason for relatedTarget 到 null . relatedTarget may also be set to null for security reasons, like when tabbing in or out of a page.

MouseEvent.relatedTarget is a similar property for mouse events.

句法

secondTarget = focusEvent.relatedTarget

规范

规范	状态	注释
UI Events The definition of 'FocusEvent.relatedTarget' in that specification.	工作草案
DOM (文档对象模型) 3 级事件规范 The definition of 'FocusEvent.relatedTarget' in that specification.	过时	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`relatedTarget`	Chrome Yes	Edge 12	Firefox 48	IE 9	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 48	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持
实验。期望将来行为有所改变。

另请参阅

FocusEvent interface it belongs to.

元数据

最后修改： Aug 30, 2019

在此页

句法

规范

浏览器兼容性

图例

另请参阅

相关话题