Promise 处于以下这些状态中的一种: pending:初始状态,既没有被兑现,也没有被拒绝。 fulfilled:表示操作成功完成。 rejected:表示操作失败。 fetch(url)返回一个Promise对象。它可以使用.then(…)将“监听器”附加到其上,以响应结果值(对请求的响应)。.then(…)再次返回一个将产生结果的Promise对象。
Promise 处于以下状态之一: pending:初始状态,既没有完成也没有被拒绝。 fulfilled:表示操作成功完成。 rejected:表示操作失败。fetch(url) 返回一个 Promise 对象。它允许使用可以响应结果值(对请求的响应)的 .then(…) 附加“监听器”。 .then(…) 再次返回 Promise 将给出结果的对象。async 和await您可以使用 ...
这通常是它应该如何从 fetch() 操作返回。此时一般应该是pending状态(可能有少数情况会因为某些错误而立即被rejected,但通常promise最初会是pending。在未来的某个时刻,它会变成resolved或rejected . 要在解决或拒绝时得到通知,您可以使用 .then() 处理程序或 .catch() 处理程序。 var nf = require('node-fetch')...
接下来我们解析一下上面的代码,console.log(1)执行输出1,构造promise对象要先执行executor,输出console.log(2);异步调用reject(true);继续输出console.log(3);setTimeout也是异步调用,被放到事件队列。promise对象创建完毕,继续console.log(7);reject事件发起回调,执行console.log(6);setTimeout发起回调,执行 console....
}else{// Make sure to return your Promise here. Don't worry// about returning a Promise; it's automatically wrapped// like Promise.resolve() does, so this chained-fetch()// Promise eventually gets the same result as the returned// recursive Promise.returnautoRetry(url, times); ...
To do promise chaining from an async function call in that way, it's only slightly less graceful. The same would be true for a fetch API returning a controller. async foo() { .. } // .. foo().promise.then(..); fetch(..).promise.then(..); But if you want to access and ret...
Description Potentially related to #11738, opening as a separate issue as requested. On first app installation I am consistently able to reproduce RemoteConfig.fetch not returning anything. Closing the app and restarting does return, how...
NOTE: TheblockAndWait()method is not anasyncmethod because it doesn't need to be - it's already returning aPromise. Making itasyncwouldn't make any sense. exportclassApiClient{ /** * I return a Promise that is resolved after the given timeout. The internal timer can ...
Solid有一个专用的API，用于获取和渲染使用createResource创建的远程数据：https://www.solidjs.com/docs...
error; } /** * Requests a URL, returning a promise. * * @param {string} url The URL we want to request * @param {object} [options] The options we want to pass to "fetch" * @return {object} An object containing either "data" ...