Window:offline 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 July 2015.

offline 事件在浏览器失去网络连接时,在 Window 接口上触发。并且 Navigator.onLine 的值变为 false

语法

在类似 addEventListener() 这样的方法中使用事件名称,或者设置事件处理器属性。

js
addEventListener("offline", (event) => {});
onoffline = (event) => {};

事件类型

一个 Event

事件处理方法别名

除了 Window 接口以外,事情处理方法属性 onoffline 同样可以用于以下目标:

示例

js
// addEventListener 版本
window.addEventListener("offline", (event) => {
  console.log("网络连接已断开。");
});

// onoffline 版本
window.onoffline = (event) => {
  console.log("网络连接已断开。");
};

规范

Specification
HTML
# event-offline
HTML
# handler-window-onoffline

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
offline event

Legend

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

Full support
Full support

参见