FetchEvent() | Web API

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FetchEvent() 构造函数创建新 FetchEvent 对象。

var fetchEvent = new FetchEvent(type, init);

type: DOMString object specifying which event the object represents. This is always fetch for Fetch events.
init 可选

clientId 只读: Client that the current service worker is controlling.
isReload 只读: A 布尔 that signifies whether the page was reloaded or not when the event was dispatched. true if yes, and false if not. Typically, pressing the refresh button in a browser is a reload, while clicking a link and pressing the back button is not. If not present, it defaults to false .
preloadResponse 只读: A Promise which returns a previously-loaded response to the client.
replacesClientId 只读: A DOMString which identifies the client which is being replaced by resultingClientId .
resultingClientId 只读: A DOMString containing the new clientId if the client changes as a result of the page load.
request 只读: Request object that would have triggered the event handler.

规范	状态	注释
服务工作者 The definition of 'FetchEvent() constructor' in that specification.	工作草案	初始定义。

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
`FetchEvent()` 构造函数	Chrome 40	Edge ≤18	Firefox 44 44 Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No	Opera 27	Safari No	WebView Android 40	Chrome Android 40	Firefox Android 44	Opera Android 27	Safari iOS No	Samsung Internet Android 4.0