因为之前已经通过缓存使用过一次了,所以为了在浏览器中使用 fetch,需要复制下该请求。varfetchRequest = event.request.clone();// 没有找到缓存。所以我们需要执行 fetch 以发起请求并返回请求数据。returnfetch(fetchRequest).then(function(response){// 检测返回数据是否有效if(!response || response.status !==2...
意即 service worker 会作用于整个源地址上。换句话说,即 service worker 会接收到该域名下所有页面 的fetch事件。如果注册 service worker 的文件路径是/example/sw.js,那么 service worker 会接收到所有页面路径以/example/为开头的 URL 地址的fetch事件(比如/example/page1//example/page2/)。 在安装阶段,最好...
To illustrate how a Fetch GET request works, let's make a call to the GitHub API to obtain a list of users. We'll use JavaScript to display this information on a web page.First, let's set up the HTML, which requires a heading and an unordered list:...
In the above code, we define afetchData()function that simulates fetching data from a server after a delay of 2 seconds usingsetTimeout(). ThefetchData()function takes a callback function as an argument and invokes it with the fetched data. We also define aprocessData()function that logs...
As you can see in the DOM specification,AbortControlleris described in a very general way. Thanks to this you can use it in any kind of asynchronous APIs — even ones that do not exist yet. At the moment only Fetch API officially supports it, but nothing stops you from using it inside...
This command executes your code and makes an HTTP request through the proxy. You should see the response text or any errors in your terminal. Limitations to Using a Proxy with node-fetch While this approach works well when using a simple proxy, you’ll find that many real-world use cases...
In this example, we use the Fetch API to retrieve the data and then investigate the response to check for errors and then either process the error or parse the JSON. Note that the promise ‘then’ clause is used even in the case of a unsuccessful HTTP response code. That is why there...
The Fetch API works in all modern browsers, including Edge, but has no IE support. It works in newer mobile browsers but may not work on older ones (and it’s common for people to not update the OS on their phones). You shouldinclude the Fetch polyfillwhen using it. It also requires...
When using async and await, you invoke axios or one of its request methods inside an asynchronous function, like in the example below: const fetchData = async () => { try { const response = await axios.get("https://api.github.com/users/mapbox"); console.log(response.data); console....
The JavaScript section will fetch theh1element via the id and set a variabletimeto increment every second (we will assign themillisecondparameter to 1000). Let’s check the code for a good view of the solution. Code snippet: <!DOCTYPE html>testSeconds: 0PlayPause varoutput=document.getElemen...