javascript - 复制前事件

Question

如果您转到 Google Chrome 开发者工具，然后选择 Scripts > Event Listener Breakpoints > Clipboard，您将在 beforecopy 中找到该事件。两个问题:

1) 这是什么？

2) 为什么有用？

Answer 1

Occurs before the selection is copied to the clipboard and before the oncopy event.

• In Internet Explorer, the onbeforecopy event occurs on the deepest element in the DOM hierarchy that contains the entire selection.
• In Google Chrome and Safari, the onbeforecopy event occurs on the deepest element in the DOM hierarchy that contains the start point of the selection.

Internet Explorer 和 WebKit 浏览器(Safari 和 Chrome)支持 beforecopy 事件。

http://help.dottoro.com/ljrlxaae.php和 Wikipedia .