Window: blur event
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
当元素失去焦点时,**blur
**事件将触发。
与 blur
相反的是focus
。
Bubbles(是否支持冒泡) | No |
---|---|
Cancelable(可撤销) | No |
Interface(接口) | FocusEvent |
Event handler property(事件处理程序属性) | onblur |
Sync / Async(同步/异步) | Sync |
Composed | Yes |
示例
>在线示例
此示例当文档失去焦点时,更改其外观。它使用addEventListener()
去监听focus
和 blur
事件。
HTML
html
<p id="log">Click on this document to give it focus.</p>
CSS
css
.paused { background: #ddd; color: #555; }
JavaScript
js
function pause() { document.body.classList.add("paused"); log.textContent = "FOCUS LOST!"; } function play() { document.body.classList.remove("paused"); log.textContent = "This document has focus. Click outside the document to lose focus."; } const log = document.getElementById("log"); window.addEventListener("blur", pause); window.addEventListener("focus", play);
结果
规范
Specification |
---|
UI Events> # event-type-blur> |
HTML> # handler-onblur> |
浏览器兼容性
Loading…
document. activeelement
的值在处理时因浏览器而异(Firefox bug 452307):IE10 将其设置为焦点将移动到的元素,而 Firefox 和 Chrome 通常将其设置为文档的 body。