Window:beforeprint 事件

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2019.

beforeprint 事件会在相关联的文档即将打印或预览打印时触发。

afterprintbeforeprint 事件允许页面在打印开始之前更改其内容(例如,也许是移除 banner)然后在打印完成后还原这些更改。一般来说,你应该更倾向于使用 @media print CSS at 规则,但在某些情况下可能有必要使用这些事件。

语法

在像 addEventListener() 的方法中使用事件名称,或设置事件处理属性。

js
addEventListener("beforeprint", (event) => {});
onbeforeprint = (event) => {};

事件类型

一个通用的 Event

示例

使用 addEventListener()

js
window.addEventListener("beforeprint", (event) => {
  console.log("打印前");
});

使用 onbeforeprint 事件处理属性:

js
window.onbeforeprint = (event) => {
  console.log("打印前");
};

规范

Specification
HTML
# event-beforeprint
HTML
# handler-window-onbeforeprint

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
beforeprint event

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参见