这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

navigationPreload 只读特性在 FetchEvent interface returns a Promise that resolves to the instance of NavigationPreloadManager associated with the current service worker registration.

句法

var promise = fetchEvent.navigationPreload
					

A Promise that resolves to the instance of NavigationPreloadManager .

范例

The following example shows the implementation of a fetch event that uses a preloaded response.

addEventListener('fetch', event => {
  event.respondWith(async function() {
    // Respond from the cache if we can
    const cachedResponse = await caches.match(event.request);
    if (cachedResponse) return cachedResponse;
    // Else, use the preloaded response, if it's there
    const response = await event.preloadResponse;
    if (response) return response;
    // Else try the network.
    return fetch(event.request);
  }());
});
					

规范

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

浏览器兼容性

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
navigationPreload Chrome 59 Edge ≤79 Firefox ? IE 不支持 No Opera 46 Safari 不支持 No WebView Android 59 Chrome Android 59 Firefox Android ? Opera Android 43 Safari iOS 不支持 No Samsung Internet Android 7.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

元数据

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